Tootfinder

At this year's Berlin Buzzwords, Viola Rädle & Raphael Franke will present gamma_flow, an open-source Python package for real-time spectral data analysis.
Learn more: https://2025.berlinbuzzwords.de/session/gamma_flow-deno…

Optimal Honeypot Ratio and Convergent Fictitious-Play Learning in Signaling Games for CPS Defense
Yueyue Xu, Yuewei Chen, Lin Wang, Zhaoyang Cheng, Xiaoming Hu
https://arxiv.org/abs/2507.11113

Optimal Honeypot Ratio and Convergent Fictitious-Play Learning in Signaling Games for CPS Defense
Cyber-Physical Systems (CPSs) are facing a fast-growing wave of attacks. To achieve effective proactive defense, this paper models honeypot deployment as a gamma-fixed signaling game in which node liveness serves as the only signal and normal-node signal gamma is exogenously fixed. We define the gamma-perfect Bayesian-Nash equilibrium (gamma-PBNE). Analytical expressions are obtained for all gamma-PBNEs, revealing three distinct equilibrium regimes that depend on the priori honeypot ratio. Furt…

Playing with Sollya today, which is a tool for generating math function polynomials. I've managed to build a gamma function for 32, 64, 80 and 128 bits which doesn't totally suck. Range reduction to 1-2, then an 11th order polynomial (for 32-bits).
https://github.…

picolibc/newlib/libm/sollya/gamma_inc.h at gamma-accuracy · picolibc/picolibc
picolibc - a C library designed for embedded 32- and 64- bit systems. - picolibc/picolibc

A Unifying Integral Representation of the Gamma Function and Its Reciprocal
Peter Reinhard Hansen, Chen Tong
https://arxiv.org/abs/2506.12112 https://

A Unifying Integral Representation of the Gamma Function and Its Reciprocal
We derive an integral expression $G(z)$ for the reciprocal gamma function, $1/Γ(z)=G(z)/π$, that is valid for all $z\in\mathbb{C}$, without the need for analytic continuation. The same integral avoids the singularities of the gamma function and satisfies $G(1-z)=Γ(z)\sin(πz)$ for all $z\in\mathbb{C}$.

VegasAfterglow: A High-Performance Framework for Gamma-Ray Burst Afterglows
Yihan Wang, Connery Chen, Bing Zhang
https://arxiv.org/abs/2507.10829 https://

VegasAfterglow: A High-Performance Framework for Gamma-Ray Burst Afterglows
Gamma-ray bursts (GRBs) are the most luminous astrophysical transients, known to be associated with core collapse of massive stars or mergers of two compact objects such as two neutron stars. They are followed by multi-wavelength afterglow emission originating from the deceleration of the relativistic jets by the ambient medium. The study of after emission offers crucial insights into the physics of relativistic shocks, the properties of the circumburst environment, as well as the physical and …

#Vancouver folks: They’ve renamed Trutch St (thank goodness, Trutch was an asshole), its new name translated into English is “Musqueamview”. In Musqueam that’s “šxʷməθkʷəyΓəmasəm” which, it turns out, sounds like “sh-musqueam-awesome” to my ears. I think it’d be cool if we were all saying sh-musqueam-awesome to each other.

Replaced article(s) found for hep-ph. https://arxiv.org/list/hep-ph/new
[1/1]:
The future muon collider for the research of the anomalous neutral quartic $Z\gamma\gamma\gamma$,...

Pricing energy spread options with variance gamma-driven Ornstein-Uhlenbeck dynamics
Tim Leung, Kevin Lu
https://arxiv.org/abs/2507.11480 https://

Pricing energy spread options with variance gamma-driven Ornstein-Uhlenbeck dynamics
We consider the pricing of energy spread options for spot prices following an exponential Ornstein-Uhlenbeck process driven by a sum of independent multivariate variance gamma processes. Within this class of mean-reverting, infinite activity price processes, the Esscher transform is used to obtain an equivalent martingale measure. We focus on the weak variance alpha-gamma process and show that it is not closed under the Esscher transform. By deriving an analytic expression for the cumulant gene…

Auditory gamma-frequency entrainment abolishes working memory deficits in a rodent model of autism #40Hz sensory entra…

Auditory Gamma-Frequency Entrainment Abolishes Working Memory Deficits in a Rodent Model of Autism
Individuals on the autism spectrum often exhibit atypical responses to sensory stimuli and difficulties with behavioral regulation, reflecting altered functional patterns in core sensory-motor circuits. These sensory processing differences suggest the potential for using patterned auditory stimulation to modulate neural activity and mitigate symptoms. While impairments in higher cognitive functions are a hallmark of autism, they remain underexplored in rodent models compared to basic sensory-mo…

Curvature-Enhanced Inertia in Curved Spacetimes: An ADM-Based Formalism with Multipole Connections
Ilias Kynigalakis
https://arxiv.org/abs/2506.12983 https…

Curvature-Enhanced Inertia in Curved Spacetimes: An ADM-Based Formalism with Multipole Connections
We propose a covariant definition of an inertia tensor on spatial hypersurfaces in general relativity, constructed via integrals of geodesic distance functions using the exponential map. In the ADM 3+1 decomposition, we consider a spacelike slice (Sigma, gamma_ij) with induced metric gamma_ij, lapse N, shift N^i, and a mass-energy density rho(x) on Sigma. At each point p in Sigma, we define a Riemannian inertia tensor I_p(u,v) as an integral over Sigma involving geodesic distances and the expon…

Diffuse gamma-ray and neutrino emission from the Milky Way and the local knee in the cosmic ray spectrum
C. Prevotat, Zh. Zhu, S. Koldobskiy, A. Neronov, D. Semikoz, M. Ahlers
https://arxiv.org/abs/2507.10823

Diffuse gamma-ray and neutrino emission from the Milky Way and the local knee in the cosmic ray spectrum
The LHAASO observatory has recently measured details of the cosmic-ray (CR) spectrum in the knee region (1 -- 10 PeV) with unprecedented precision, including its average CR mass composition and the spectrum of the proton component. We use these precision measurements, combined with direct measurements of CRs by space-based detectors, to derive predictions for the spectrum of diffuse gamma-ray and neutrino emission from the interstellar medium under the assumption that the CR spectrum is univers…

Species-Dependent Electron Emission from Nanoparticles under Gamma Irradiation
Darukesha B H M
https://arxiv.org/abs/2507.11317 https://

Species-Dependent Electron Emission from Nanoparticles under Gamma Irradiation
In this study, various nanoparticle species-including Au and Gd$_2$O$_3$-were irradiated with low-energy gamma rays, such as 59.5 keV photons from $^{241}$Am. Pulse-height spectra were recorded using a liquid-scintillation counting system before and after dispersing the nanoparticles into the scintillator, and the differences between them were analyzed to infer the interaction outcomes. Gd$_2$O$_3$ nanoparticles emitted numerous electrons; however, under identical experimental conditions, no de…

SU(1,1) coherent states for the Dunkl- Klein-Gordon equation in its canonical form
M. Salazar-Ram\'irez, J. A. Mart\'inez-Nu\~no, MR Cordero-L\'opez
https://arxiv.org/abs/2507.10947

SU(1,1) coherent states for the Dunkl- Klein-Gordon equation in its canonical form
Using representation-theoretic techniques associated with the $\mathfrak{su}(1,1)$ symmetry algebra, we construct Perelomov coherent states for the Dunkl-Klein-Gordon equation in its canonical form, which is free of first-order Dunkl derivatives. Our analysis is restricted to the even-parity sector and to the regime where the curvature constant $R$ is much smaller than the system's kinetic energy. The equation under consideration emerges from a matrix-operator framework based on Dirac gamma mat…

newASTROGAM -- The New MeV to GeV Gamma-ray Observatory
D. Berge, M. N. Mazziotta, M. Tavani, V. Tatischeff, U. Oberlack
https://arxiv.org/abs/2507.08133 h…

newASTROGAM -- The New MeV to GeV Gamma-ray Observatory
newASTROGAM is a breakthrough mission concept for the study of the non-thermal Universe from space with gamma rays in the energy range from 15 keV to 3 GeV. It is based on advanced space-proven detector technologies, which will achieve unprecedented sensitivity, angular and energy resolution combined with polarimetric capability. Since the MeV gamma-ray energy range is the most under-explored electromagnetic window to the Universe, a mission in this energy range can for the first time sensitive…

Ion acceleration in Fermi-LAT behind-the-limb solar flares: the role of coronal shock waves
Alexander Warmuth, Melissa Pesce-Rollins, Nicola Omodei, Song Tan
https://arxiv.org/abs/2507.08452

Ion acceleration in Fermi-LAT behind-the-limb solar flares: the role of coronal shock waves
We investigate the relationship between the gamma-ray emission measured with Fermi-LAT and radio signatures of coronal shock waves in four behind-the-limb (BTL) solar flares. All events were associated with metric type II radio burst. Both start and end times of the radio bursts were synchronized with the gamma-ray emission. The type II bursts associated with the BTL gamma-ray flares had higher speeds and lower formation heights than those of an average sample. These findings support the notion…

$\Gamma$-convergence for nonlocal phase transitions involving the $H^{1/2}$ norm
Tim Heilmann
https://arxiv.org/abs/2507.11054 https://

$Γ$-convergence for nonlocal phase transitions involving the $H^{1/2}$ norm
We study functionals \begin{equation*} F_\varepsilon (u) := λ_\varepsilon \int_ΩW(u) \, dx + \varepsilon \|u\|_{H^{1/2}}^2 \end{equation*} for a double well potential $W$ and the Gagliardo seminorm $\|\cdot\|_{H^{1/2}}$ when $\varepsilon \ln(λ_\varepsilon) \rightarrow k$ as $\varepsilon \rightarrow 0^+$ and show compactness in the space of $BV$ functions on $Ω$ and the $Γ$-convergence to the classical surface tension functional.

Bayesian multivariate models for bounded directional data
Joel Montesinos-Vazquez, Gabriel N\'u\~nez-Antonio
https://arxiv.org/abs/2507.11784 https://

Bayesian multivariate models for bounded directional data
In some areas of knowledge there are data representing directions restricted to a specific range of values. Consequently, it is useful to have models for describing variables defined in subsets of the k-dimensional unit sphere. This need has led to the development of models such as the multivariate projected Gamma distribution. However, the proposal of multivariate models whose marginal variables are defined only in sections of the unit circle and with a flexible dependency structure is limited…

Simulation of dark photon sensitivity in $\eta \rightarrow \gamma e^ e^-$ at HIAF
Zaiba Mushtaq, Rong Wang, Xiaolin Kang, Yang Liu, Ye Tian, Xiong He, Hao Qiu, Xurong Chen
https://arxiv.org/abs/2506.11733

Simulation of dark photon sensitivity in $η\rightarrow γe^+e^-$ at HIAF
We present a simulation study of dark photon sensitivity in a suggested $η$ factory experiment at Huizhou. The vast number of $η$ mesons are produced by bombarding the high-intensity HIAF proton beam on a multi-layer target of light nucleus. The kinematic energy of the beam is at 1.8 GeV. For a prior experiment of one-month running, about $5.9 \times 10^{11}$ $η$ samples would be collected, providing substantial data for a sound statistical analysis. A compact spectrometer based on the full …

Broadband Spectral Modeling of Blazars: Constraining the Lorentz Factor and Gamma-Ray Emission Site
Ajay Sharma, Aishwarya Sarath, Sakshi Chaudhary, Debanjan Bose
https://arxiv.org/abs/2506.12832

Broadband Spectral Modeling of Blazars: Constraining the Lorentz Factor and Gamma-Ray Emission Site
We present a comprehensive temporal and spectral analysis of a few blazars using multi-wavelength observations. Rapid flux variations are quantified via the doubling/halving timescale method, revealing the shortest variability timescales of a few hours in $γ$-ray emissions. The broadband fractional variability is systematically computed and examined as a function of frequency, displaying a characteristic double-hump structure akin to the typical spectral energy distribution (SED) of blazars. T…

Detecting transitions from steady states to chaos with gamma distribution
Haiyan Wang, Ying Wang
https://arxiv.org/abs/2506.10724 https://

Detecting transitions from steady states to chaos with gamma distribution
In this paper, we introduce a novel method to identify transitions from steady states to chaos in stochastic models, specifically focusing on the logistic and Ricker equations by leveraging the gamma distribution to describe the underlying population. We begin by showing that when the variance is sufficiently small, the stochastic equations converge to their deterministic counterparts. Our analysis reveals that the stochastic equations exhibit two distinct branches of the intrinsic growth rate,…

Real-time, Adaptive Radiological Anomaly Detection and Isotope Identification Using Non-negative Matrix Factorization
Chandler Jones, Mark Bandstra, Stefan Faaland, Yue Shi Lai, Nico Abgrall, Scott Suchyta, Reynold Cooper
https://arxiv.org/abs/2507.10715

Real-time, Adaptive Radiological Anomaly Detection and Isotope Identification Using Non-negative Matrix Factorization
Spectroscopic anomaly detection and isotope identification algorithms are integral components in nuclear nonproliferation applications such as search operations. The task is especially challenging in the case of mobile detector systems due to the fact that the observed gamma-ray background changes more than for a static detector system, and a pretrained background model can easily find itself out of domain. The result is that algorithms may exceed their intended false alarm rate, or sacrifice d…

Four-Loop Renormalisation of Chiral Gauge Theories with Non-Anticommuting $\gamma_5$ in the BMHV Scheme
Andreas von Manteuffel, Dominik St\"ockinger, Matthias Wei{\ss}wange
https://arxiv.org/abs/2506.12253

Four-Loop Renormalisation of Chiral Gauge Theories with Non-Anticommuting $γ_5$ in the BMHV Scheme
We present the complete 4-loop renormalisation of an Abelian chiral gauge theory in the Breitenlohner-Maison / `t Hooft-Veltman (BMHV) scheme. Employing a non-anticommuting $γ_5$ in dimensional regularisation, we determine the full set of symmetry restoring counterterms from the quantum action principle. Our calculation represents the highest-order application of the BMHV framework so far, pushing the limits of a self-consistent treatment of $γ_5$ at the multi-loop level. We describe the comp…

Superheating and melting phenomena of a vibrated granular layer of cubic particles
Francisco L\'opez-Gonz\'alez, Gustavo M. Rodr\'iguez-Li\~n\'an, Fernando Donado, Felipe Pacheco V\'azquez, Luis Fernando Elizondo-Aguilera
https://arxiv.org/abs/2507.07305

Superheating and melting phenomena of a vibrated granular layer of cubic particles
We report the combined results of experiments and molecular dynamics simulations conducted to investigate superheating phenomena in vertically vibrated granular matter. Specifically, we consider a system of cubic particles densely packed in a square-lattice array and subjected to different shaking strengths, denoted by Gamma, approaching a critical value Gamma_c. Below Gamma_c, the superheated crystalline array remains indefinitely stable. Above Gamma_c, it transitions progressively into a gran…

Gamma-Ray Bursts Calibrated by Using Artificial Neural Networks from the Pantheon Sample
Zhen Huang, Xin Luo, Bin Zhang, Jianchao Feng, Puxun Wu, Yu Liu, Nan Liang
https://arxiv.org/abs/2506.08929

Gamma-Ray Bursts Calibrated by Using Artificial Neural Networks from the Pantheon+ Sample
In this paper, we calibrate the luminosity relation of gamma-ray bursts (GRBs) by Artificial Neural Networks (ANN) which is employed to analyze the Pantheon+ sample of type Ia supernovae (SNe Ia) in a manner independent of cosmological assumptions. The A219 GRB dataset are used to calibrate the Amati relation (\(E_{\rm p}\)-\(E_{\rm iso}\)) at low redshift with the ANN framework, facilitating the construction of the Hubble diagram at higher redshifts. Cosmological models are constrained with GR…

Testing the influence of anisotropic CR transport and the Galactic magnetic field structure on the all-sky gamma-ray emission
Julien D\"orner, Jonas Hellrung, Julia Becker Tjus, Horst Fichtner
https://arxiv.org/abs/2507.12074

Testing the influence of anisotropic CR transport and the Galactic magnetic field structure on the all-sky gamma-ray emission
The spatial diffusion of energetic particles in a magnetic field composed of a large-scale background and a small-scale turbulent component should be expected to be anisotropic. While such anisotropic diffusion has been known for quite a while in first-principle plasma physics and while it is required for an understanding of the transport of cosmic rays in the heliosphere or close to supernova remnants, only in recent years it has also become of particular interest for the modeling of Galactic …

Phase-Induced Particle Creation in the Kappa-Gamma Vacuum
Arash Azizi
https://arxiv.org/abs/2507.05299 https://arxiv.org/pdf/2507.052…

Phase-Induced Particle Creation in the Kappa-Gamma Vacuum
We introduce a two-parameter ($κ, γ$) family of field modes in flat spacetime that generalizes the recently developed $κ$-plane wave modes, which correspond to real squeezing. By incorporating a phase parameter, $γ$, our new kappa gamma plane wave modes describe a vacuum state, $| 0_{κ,γ} \rangle$, characterized by continuous-mode phase squeezing, where $κ$ governs the squeezing magnitude and $γ$ sets its angle. This generalization reveals a novel physical effect: particle creation…

Observation of the electromagnetic radiative decays of the \boldmath{$\Lambda(1520)$} and \boldmath{$\Lambda(1670)$} to \boldmath{$\gamma\Sigma^0$}
BESIII Collaboration, et al.
https://arxiv.org/abs/2507.11145

Observation of the electromagnetic radiative decays of the \boldmath{$Λ(1520)$} and \boldmath{$Λ(1670)$} to \boldmath{$γΣ^0$}
Using $(10087\pm 44)\times10^6$ $J/ψ$ events collected with the BESIII detector, we report the first observation of the electromagnetic radiative decays of the $Λ(1520)$ and $Λ(1670)$ to $γΣ^0$, with a statistical significance of $16.6σ$ and $23.5σ$, respectively. The ratio of the branching fractions $\frac{\mathcal{B}(Λ(1520)\toγΛ)}{\mathcal{B}(Λ(1520)\toγΣ^0)}$ is determined to be $2.88\pm0.27(\text{stat.})\pm0.21(\text{syst.})$, which is in good agreement with flavor SU(3) symme…

The production of orbitally modulated UHE photons in LS 5039
V. Bosch-Ramon, D. Khangulyan
https://arxiv.org/abs/2507.11438 https://a…

The production of orbitally modulated UHE photons in LS 5039
Gamma-ray binaries present emission that is variable and can reach UHE. The processes behind the acceleration of the particles that produce this very energetic radiation are yet to be understood. We probe the properties of the particle accelerator and the UHE photon emitter in the gamma-ray binary LS 5039. From the properties of the binary system and the UHE radiation detected by HAWC, we used analytical tools to investigate how these properties constrain the emission and acceleration regions, …

This https://arxiv.org/abs/2409.18421 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Moment varieties of the inverse Gaussian and gamma distributions are nondefective
We show that the parameters of a $k$-mixture of inverse Gaussian or gamma distributions are algebraically identifiable from the first $3k-1$ moments, and rationally identifiable from the first $3k+2$ moments. Our proofs are based on Terracini's classification of defective surfaces, careful analysis of the intersection theory of moment varieties, and a recent result on sufficient conditions for rational identifiability of secant varieties by Massarenti--Mella.

Distributions based on Stable Mixtures and Gamma-Stable Convolutions
Nomvelo Karabo Sibisi
https://arxiv.org/abs/2507.06665 https://a…

Distributions based on Stable Mixtures and Gamma-Stable Convolutions
This paper explores mixture distributions induced by a product of the positive stable random variable and a power of another positive random variable. The paper also considers the convolution of the stable density with a gamma density. These two constructs, mixing and convolution, suffice to generate a rich family of distributions. An example is the positive Linnik distribution, which is known to arise from a product involving stable and gamma random variables. We show that gamma-Linnik convolu…

Unambiguous GeV gamma-rays from molecular clouds illuminated by particles diffusing from the adjacent supernova remnant G335.2 0.1 that is confined in an expanding bubble
Chen Huang, Xiao Zhang, Yang Chen, Qian-Qian Zhang, Wen-Juan Zhong, Xin Zhou
https://arxiv.org/abs/2507.08709

Unambiguous GeV gamma-rays from molecular clouds illuminated by particles diffusing from the adjacent supernova remnant G335.2+0.1 that is confined in an expanding bubble
We report the detection of GeV gamma-ray emission likely associated with supernova remnant (SNR) G335.2+0.1 and the finding of a molecular cloud ($\sim20$--$30^\prime$ in angular size) that is very likely in physical contact with the SNR and responsible for the gamma-ray emission. Using the 16.8 yr Fermi-LAT data, an extended emission, with a significance of 13.5 $σ$ and a radius 0.24° in 0.2--500 GeV in the uniform-disk model, was found to the adjacent east of the SNR. With archival Mopra CO…

Fluctuations in email size modeled using a gamma-like distribution
Yoshitsugu Matsubara
https://arxiv.org/abs/2506.03500 https://arxi…

Fluctuations in email size modeled using a gamma-like distribution
A previously established frequency distribution model, which integrates a lognormal distribution with a logarithmic equation, effectively characterizes fluctuations in email size during sending requests. In addition, an email size generation model has been developed based on this log-normal-like framework. While the fitting of these models has been deemed satisfactory, they can be further enhanced in the range of small email sizes. This study advances these models by incorporating a gamma distr…

The Electron-Gamma Coincidence Setup DAGOBERT
B. Hesbacher, G. Steinhilber, J. Isaak, N. Pietralla, J. Birkhan, M. L. Cort\'es, D. H. Jakubassa-Amundsen, I. Jurosevic, P. von Neumann-Cosel, M. Rech, X. Roca-Maza, D. Schneider
https://arxiv.org/abs/2506.02072

The Electron-Gamma Coincidence Setup DAGOBERT
The QCLAM electron spectrometer at the S-DALINAC electron accelerator at Technische Universität Darmstadt has been extended by the DAGOBERT $γ$-detector array consisting of fast timing and high efficiency LaBr$_3$:Ce detectors to perform electron-gamma coincidence measurements. The functionality of the setup and data acquisition system was demonstrated in a commissioning measurement on $^{12}\textrm{C}$ observing the $4.44\,$MeV and $15.11\,$MeV states. A medium-heavy nucleus, $^{96}\textrm{R…

The isostructural alpha-gamma phase transition in cerium from the perspective of meta-generalized gradient approximations
Ashesh Giri, Chandra Shahi, Adrienn Ruzsinszky
https://arxiv.org/abs/2506.03578

The isostructural alpha-gamma phase transition in cerium from the perspective of meta-generalized gradient approximations
Meta-generalized gradient approximations (meta-GGAs) on the third rung of the functional hierarchy are gaining increasing relevance for the electronic structure. Meta-GGAs are constructed from numerous ingredients including the orbital kinetic energy density that make them more flexible than generalized gradient approximations (GGAs) including the heavily used PBE-GGA. Still, most meta-GGAs cope with the expected limitations of a semilocal density functional when band gaps or localization of el…

Average Power-Density Spectrum of short and long Fermi-GBM Gamma-Ray Bursts
Else Magnus, Jannes Loonen, Rose S. Stanley, Paul Coppin, Krijn D. de Vries, Nick van Eijndhoven
https://arxiv.org/abs/2506.09610

Average Power-Density Spectrum of short and long Fermi-GBM Gamma-Ray Bursts
Gamma-ray bursts (GRBs) are the most powerful electromagnetic outbursts in the Universe and emit a vast amount of their energy in the form of gamma rays. Their duration is extremely short on cosmic timescales, but they show a wealth of time variability in their light curves. Properties of this variability may carry information about the processes the gamma rays emerge from, which are still poorly understood. This research investigates the redshift-corrected gamma-ray light curves of 159 long GR…

Raabe's Formula For Gamma Function Via Riemann-Liouville Fractional Integrals And Generalized Glaisher Constants
Efe G\"urel
https://arxiv.org/abs/2505.22666

Raabe's Formula For Gamma Function Via Riemann-Liouville Fractional Integrals And Generalized Glaisher Constants
In this paper, we prove Raabe-type integral formulas for gamma function via left and right sided Riemann-Liouville fractional integrals. As corollaries, we give the left and right sided repeated integration formulas for the log-gamma and related functions. The relationship between the generalized Glaisher constants and aforementioned integrals are investigated.

Going out for some pond building parts but had to take a break at the cΓuumaʕas river (su-u-ma-as) to watch the fishers coming in from a morning of sockeye salmon fishing. 🎣
Lots of sounds of Bald Eagles in the distance. Probably in the trees across the river looking for a fish to snatch up.
check out the pro trailer parking with the offset stalls. 😂 🅿️
#portalberni #poolpond

Indirect Detection of Dark Matter Around a Supermassive Black Hole with High Energy-Resolution Gamma-Ray Telescopes
Yu Watanabe, Alexander Kusenko, Shigeki Matsumoto
https://arxiv.org/abs/2506.07009

Indirect Detection of Dark Matter Around a Supermassive Black Hole with High Energy-Resolution Gamma-Ray Telescopes
We explore whether the unprecedented energy resolution of upcoming gamma-ray telescopes can uncover relativistic effects in photon spectra resulting from dark matter (DM) annihilation or decay near the supermassive black hole (SMBH) at the Galactic Center (GC), specifically, gravitational redshift, Doppler broadening due to Lorentz boosts, and kinetic energy enhancements arising from high DM velocities. By modeling DM density and velocity profiles under various SMBH formation scenarios and DM p…

Exploring the probing power of gamma-Dor's inertial dip for core magnetism: case of a toroidal field
Lucas Barrault, Lisa Bugnet, St\'ephane Mathis, Joey S. G. Mombarg
https://arxiv.org/abs/2507.00308

Exploring the probing power of gamma-Dor's inertial dip for core magnetism: case of a toroidal field
Gamma-Dor stars are ideal targets for studies of stellar innermost dynamical properties due to their rich asteroseismic spectrum of gravity modes. Integrating internal magnetism to the picture appears as the next milestone of detailed asteroseismic studies, for its prime importance on stellar evolution. The inertial dip in prograde dipole modes period-spacing pattern of gamma-Dors stands out as a unique window on the convective core structure and dynamics. Recent studies have highlighted the de…

Bias in estimating Theil, Atkinson, and dispersion indices for gamma mixture populations
Jackson Assis, Roberto Vila, Helton Saulo
https://arxiv.org/abs/2506.22168

Bias in estimating Theil, Atkinson, and dispersion indices for gamma mixture populations
In this paper, we derive closed-form expressions for the bias of estimators of the Theil, Atkinson, and dispersion indices when the underlying population follows a finite mixture of gamma distributions. Our methodology builds on probabilistic techniques grounded in Mosimann's proportion-sum independence theorem and the gamma-Dirichlet connection, enabling analytical tractability in the presence of population heterogeneity. These results extend existing findings for single gamma models.

Searching for radio pulses from radio-quiet gamma-ray pulsars with FAST
S. Q. Wang, S. Dai, N. Wang, A. Zic, G. Hobbs, D. Li, R. B. Ding, L. Peng, Z. C. Pan, S. B. Zhang
https://arxiv.org/abs/2506.10565

Searching for radio pulses from radio-quiet gamma-ray pulsars with FAST
We present periodicity and single-pulse searches at 1250 MHz for 22 radio-quiet gamma-ray pulsars, conducted using the Five-hundred-meter Aperture Spherical Radio Telescope (FAST). For PSR J1813$-$1246, we successfully detected pulsed signals with a spin period of 48.08 ms and a dispersion measure of 209.85 ${\rm pc cm^{-3}}$, consistent with the spin period measured at gamma-ray wavelengths. The estimated flux density is approximately 9 $μ$Jy. For the remaining 21 sources, no radio emission w…

Impact of local foreground radiations on Very High Energy observations of extragalactic sources
Alberto Franceschini, Giorgio Galanti
https://arxiv.org/abs/2507.11190

Impact of local foreground radiations on Very High Energy observations of extragalactic sources
In the framework of exploiting Very High Energy (VHE) gamma-ray observations of extragalactic sources to infer constraints on the intensity of cosmological background radiations, as well as on deviations from the standard model of particles and physical interactions (like violations of Lorentz invariance and axion-like particles -- LIV and ALPs), we discuss here possible contaminant effects due to the presence of radiations fields from local sources. We specifically model and analyze the foregr…

Constrain magnetar parameters by taking into account the evolutionary effects of radius and moment of inertia with \emph{Swift}/XRT data
Lin Lan, He Gao, Shunke Ai, Wen-Jin Xie, Yong Yuan, Long Li, Li-Ping Xin, Jian-Yan Wei
https://arxiv.org/abs/2507.11110

Constrain magnetar parameters by taking into account the evolutionary effects of radius and moment of inertia with \emph{Swift}/XRT data
A newly born millisecond magnetar has been proposed as one possible central engine of some gamma-ray bursts (GRBs) with X-ray plateau emission. In this work, we systematically analyzed the \emph{Swift}/XRT data of long GRBs with plateau emission that were detected before 2023 December, and estimated the magnetar parameters by considering the $R/I$ evolutionary effects, and investigated possible relationships among these parameters and their relation to the GRB jet and magnetar wind radiation. W…

HAWC Performance Enhanced by Machine Learning in Gamma-Hadron Separation
R. Alfaro, C. Alvarez, A. Andr\'es, E. Anita-Rangel, M. Araya, J. C. Arteaga-Vel\'azquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, P. Bangale, E. Belmont-Moreno, A. Bernal, T. Capistr\'an, A. Carrami\~nana, F. Carre\'on, S. Casanova, U. Cotti, E. De la Fuente, D. Depaoli, P. Desiati, N. Di Lalla, R. Diaz Hernandez, M. A. DuVernois, J. C. D\'iaz-V\'elez, K. Engel, T. Ergin, C. Espinoza,…

HAWC Performance Enhanced by Machine Learning in Gamma-Hadron Separation
Improving gamma-hadron separation is one of the most effective ways to enhance the performance of ground-based gamma-ray observatories. With over a decade of continuous operation, the High-Altitude Water Cherenkov (HAWC) Observatory has contributed significantly to high-energy astrophysics. To further leverage its rich dataset, we introduce a machine learning approach for gamma-hadron separation. A Multilayer Perceptron shows the best performance, surpassing traditional and other Machine Learni…

Searching for the neutral triple gauge couplings in the process $\mu^ \mu^-\to \gamma \nu\bar{\nu}$ at muon colliders
Wei Xie, Ji-Chong Yang
https://arxiv.org/abs/2507.08681

Searching for the neutral triple gauge couplings in the process $μ^+μ^-\to γν\barν$ at muon colliders
We investigate the sensitivity of future high-energy muon colliders to neutral triple gauge couplings (nTGCs) through the process $μ^{+}μ^{-}\toγν\barν$ within the Standard Model Effective Field Theory (SMEFT) framework. Extending beyond previous studies, we consider a set of 14 dimension-8 operators, including both Higgs-related and pure gauge structures. By computing the cross sections and performing Monte Carlo simulations at multiple center-of-mass energies (3 - 30 TeV), we demonstrate…

A class of charged and charged-Taub-NUT metrics in the presence of a massless scalar field and some of their astrophysical aspects
Fatemeh Sadeghi, Behrouz Mirza, Marzieh Moradzadeh
https://arxiv.org/abs/2506.09922

A class of charged and charged-Taub-NUT metrics in the presence of a massless scalar field and some of their astrophysical aspects
We consider a class of exact solutions to the Einstein equations in the presence of a scalar field, recently introduced in [arXiv:2307.09328, arXiv:2307.13588], and derive their generalized form with dyonic charges using Harrison transformations. For specific parameter values, this class of metrics includes the charged Fisher Janis Newman Winicour (FJNW) and gamma metrics. We then investigate the motion of neutral particles in the background of these metrics and derive the corresponding effecti…

Gamma-convergence of nonlocal energies for partitions
Thomas Gabard, Vincent Millot
https://arxiv.org/abs/2506.20215 https://arxiv.or…

Gamma-convergence of nonlocal energies for partitions
We prove that certain nonlocal functionals defined on partitions made of measurable sets Gamma-converge to a local functional modeled on the perimeter in the sense of De Giorgi. Those nonlocal functionals involve generalized surface tension coefficients, and are lower semicontinuous even if the coefficients do not satisfy the triangular inequality. It implies a relaxation process in the limit, and provides a novel effect compare to the known gamma-convergence of the fractional perimeter towards…

Replaced article(s) found for astro-ph.HE. https://arxiv.org/list/astro-ph.HE/new
[1/1]:
The possibility of multi-TeV secondary gamma rays from GRB221009A

Effectiveness of the DEJAMPS purification protocol in noisy entangled photon systems, a Monte Carlo simulation
Vasilis Skarlatos, Nikos Konofaos
https://arxiv.org/abs/2506.22830

Effectiveness of the DEJAMPS purification protocol in noisy entangled photon systems, a Monte Carlo simulation
Entanglement purification is a critical enabling technology for quantum communication, allowing high-fidelity entangled pairs to be distilled from noisy resources. We present a comprehensive Monte Carlo study of the DEJMPS purification protocol applied to polarization-entangled photon pairs subject to both amplitude-damping noise (gamma) and dephasing noise (p). By sweeping (gamma, p) over a two-dimensional grid and performing repeated stochastic trials, we map out the average fidelity and aver…

Unbiased estimation in new Gini index extensions under gamma distributions
Roberto Vila, Helton Saulo
https://arxiv.org/abs/2506.00666 https://

Unbiased estimation in new Gini index extensions under gamma distributions
In this paper, we propose two new flexible Gini indices (extended lower and upper) defined via differences between the $i$-th observation, the smallest order statistic, and the largest order statistic, for any $1 \leqslant i \leqslant m$. For gamma-distributed data, we obtain exact expectations of the estimators and establish their unbiasedness, generalizing prior works by [Deltas, G. 2003. The small-sample bias of the gini coefficient: Results and implications for empirical research. Review of…

Study of Higgs boson pair production in the $HH \rightarrow b \overline{b} \gamma \gamma$ final state with 308 fb$^{-1}$ of data collected at $\sqrt{s} = 13$ TeV and 13.6 TeV by the ATLAS experiment
ATLAS Collaboration
https://arxiv.org/abs/2507.03495

Study of Higgs boson pair production in the $HH \rightarrow b \overline{b} γγ$ final state with 308 fb$^{-1}$ of data collected at $\sqrt{s} = 13$ TeV and 13.6 TeV by the ATLAS experiment
A search for Higgs boson pair production in the $b \overline{b} γγ$ final state is performed. The proton-proton collision dataset in this analysis corresponds to an integrated luminosity of 308 fb$^{-1}$, consisting of two samples, 140 fb$^{-1}$ at a centre-of-mass energy of 13 TeV and 168 fb$^{-1}$ at 13.6 TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same fi…

A realistic photon spectra in polarized {\gamma}{\gamma} processes in SANCphot
Sergey G. Bondarenko, Aidos Issadykov, Lidia V. Kalinovskaya, Andrey A. Sapronov
https://arxiv.org/abs/2507.06791

A realistic photon spectra in polarized γγ processes in SANCphot
This work presents an approach to improve the precision of polarized photon-photon collisions simulation implemented in the SANCphot package. The basic linear Compton approximation of the incoming photon spectrum is extended to a general energy distribution and a realistic description of circular or linear polarizations as expected to be seen at photon-photon colliders.

LHAASO Protons versus LHAASO Diffuse Gamma Rays: A Consistency Check
Luis Enrique Espinosa Castro, Francesco Lorenzo Villante, Vittoria Vecchiotti, Carmelo Evoli, Giulia Pagliaroli
https://arxiv.org/abs/2506.06593

LHAASO Protons versus LHAASO Diffuse Gamma Rays: A Consistency Check
We perform the first direct consistency check between the recently measured proton spectrum at the knee by LHAASO and the collaboration's own high-precision mapping of Galactic diffuse gamma-ray emission. By modeling the hadronic gamma-ray production using the updated cosmic-ray spectra, gas templates and cross-section models, we show that the predicted gamma-ray flux robustly overshoots the LHAASO data in both inner and lateral Galactic regions. This persistent mismatch in both normalization a…

Fifty Years of CAK
Jorick S. Vink (Armagh Observatory,Planetarium)
https://arxiv.org/abs/2506.06421 https://arxiv.org/pdf/2506.06421

Fifty Years of CAK
We present a new framework for massive star evolution that is no longer driven by Dutch or other mass-loss rate Recipes, but which take the physics of Gamma or L/M dependent mass loss consistently into account. We first discuss the hot-star mass-loss kink and the transition mass loss rate between optically thin and thick winds, before discussing vertical stellar evolution, mass evaporation, and the maximum black hole (BH) mass. We end with a suggestion that a recently uncovered red supergiant (…

Efficient Gibbs Sampling in Cox Regression Models Using Composite Partial Likelihood and P\'olya-Gamma Augmentation
Shu Tamano, Yui Tomo
https://arxiv.org/abs/2506.04675

Efficient Gibbs Sampling in Cox Regression Models Using Composite Partial Likelihood and Pólya-Gamma Augmentation
The Cox regression model and its Bayesian extensions are widely used in survival analysis. However, standard Bayesian approaches require modeling of the baseline hazard, and their full conditional distributions lack closed-form expressions. Therefore, the Metropolis-Hastings sampling algorithm is typically employed, whose efficiency is highly sensitive to the choice of proposal distribution. To address these issues, we propose the GS4Cox, an efficient Gibbs sampling algorithm for the Cox regres…

Multi-Instrument Search for Gamma-Ray Counterpart of X-ray Transients detected by EP/WXT
Yan-Qiu Zhang, Wang-Chen Xue, Jin-Peng Zhang, Ce Cai, Shao-Lin Xiong, Cheng-Kui Li, Yuan Liu, Chen-Wei Wang, Hao-Xuan Guo, Shuo Xiao, Wen-Jun Tan, Chao Zheng, Jia-Cong Liu, Sheng-Lun Xie, Peng Zhang, Wen-Long Zhang, Yue Wang, Zheng-Hang Yu, Yang-Zhao Ren, Ping Wang, Yue Huang, Xiao-Bo Li, Xiao-Yun Zhao, Shi-Jie Zheng, Zhen Zhang, Shu-Xu Yi, Li-Ming Song, Shuang-Nan Zhang

Multi-Instrument Search for Gamma-Ray Counterpart of X-ray Transients detected by EP/WXT
As a soft X-ray imager with unprecedentedly large field of view, EP/WXT has detected many (fast) X-ray transients, whose nature is very intriguing. Whether there is gamma-ray counterpart for the X-ray transient provides important implications for its origin. Some of them have been reported to be associated with GRB, however, a systematic study on the gamma-ray emission of these X-ray transients is lacking. In this work, we implemented a comprehensive targeted search for gamma-ray counterparts t…

Observation of $t\bar{t}\gamma\gamma$ production at $\sqrt{s}=$13 TeV with the ATLAS detector
ATLAS Collaboration
https://arxiv.org/abs/2506.05018 https://…

Observation of $t\bar{t}γγ$ production at $\sqrt{s}=$13 TeV with the ATLAS detector
This paper presents the first observation of top-quark pair production in association with two photons ($t\bar{t}γγ$). The measurement is performed in the single-lepton decay channel using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. The data correspond to an integrated luminosity of 140 fb$^{-1}$ recorded during Run 2 at a centre-of-mass energy of 13 TeV. The $t\bar{t}γγ$ production cross section, measured in a fiducial phase space based on par…

Identifying Merger-Driven Long Gamma-Ray Bursts based on Machine Learning
Si-Yuan Zhu, Hui-Ying Deng, Fu-Wen Zhang, Qian-Zi Mo, Pak-Hin Thomas Tam
https://arxiv.org/abs/2506.08675

Identifying Merger-Driven Long Gamma-Ray Bursts based on Machine Learning
Gamma-ray bursts (GRBs) are classified as Type I GRBs originated from compact binary mergers and Type II GRBs originated from massive collapsars. While Type I GRBs are typically shorter than 2 seconds, recent observations suggest that some extend to tens of seconds, forming a potential subclass, Type IL GRBs. However, apart from their association with kilonovae, so far no rapid identification is possible. Given the uncertainties and limitations of optical and infrared afterglow observations, an…

Baryon-antibaryon generalized distribution amplitudes and $e^ e^- \to B \bar{B} \gamma$
Jing Han, Bernard Pire, Qin-Tao Song
https://arxiv.org/abs/2506.09854

Baryon-antibaryon generalized distribution amplitudes and $e^+ e^- \to B \bar{B} γ$
Baryon-antibaryon generalized distribution amplitudes (GDAs) give an access to timelike gravitational form factors (GFFs) which are complementary to the spacelike ones which can be deduced from the hadronic generalized parton distributions (GPDs) measured in deep exclusive electroproduction processes. They allow to probe the GFFs of unstable baryons in the baryon octet, since the second moments of hadronic generalized distribution amplitudes (GDAs) lead to the timelike GFFs. These GDAs can be m…

Improved Gamma-Hadron Separation for PeV Photon Searches with IceCube (ICRC 2025)
Frank G. Schr\"oder (for the IceCube Collaboration), Federico Bontempo (for the IceCube Collaboration)
https://arxiv.org/abs/2507.05833

Improved Gamma-Hadron Separation for PeV Photon Searches with IceCube (ICRC 2025)
IceTop, the km$^2$ surface array of the IceCube Neutrino Observatory at the South Pole, is sensitive to air showers of all primary particles, including gamma rays. In particular, in the PeV energy range, the combination of IceTop and IceCube's deep optical detector provides excellent gamma-hadron separation. Almost all air showers induced by cosmic-ray protons and heavier nuclei in this energy range contain high-energy muons detectable by the deep detector, while most photon-induced air showers…

Replaced article(s) found for hep-ex. https://arxiv.org/list/hep-ex/new/
[1/1]:
Search for excited tau leptons in the $\tau\tau\gamma$ final state in proton-proton collisions at...

A New Search Pipeline for Short Gamma Ray Bursts in Fermi/GBM Data -- A 50% Increase in the Number of Detections
Ariel Perera, Barak Zackay, Tejaswi Venumadhav
https://arxiv.org/abs/2507.05739

A New Search Pipeline for Short Gamma Ray Bursts in Fermi/GBM Data -- A 50% Increase in the Number of Detections
In this paper, we present the development and the results of a new search pipeline for short gamma-ray bursts (sGRBs) in the publicly available data from the Gamma-Ray Burst Monitor (GBM) on board the Fermi satellite. This pipeline uses rigorous statistical methods that are designed to maximize the information extracted from the Fermi/GBM detectors. Our approach differs substantially from existing search efforts in several aspects: The pipeline includes the construction of template banks, Poiss…

Inclusive open charm photoproduction in ultraperipheral collisions at the LHC with G$\gamma$A-FONLL
Matteo Cacciari, Gian Michele Innocenti, Anna M. Sta\'sto
https://arxiv.org/abs/2506.09893

Inclusive open charm photoproduction in ultraperipheral collisions at the LHC with G$γ$A-FONLL
We compute the inclusive $D^{0}$ production cross section in ultraperipheral Pb-Pb collisions at the LHC as a function of the $D^{0}$ transverse momentum and rapidity. These calculations are carried out within the new G$γ$A-FONLL (Generalized Photon-Nucleus FONLL) framework, which can predict photonuclear cross sections for charm and beauty hadrons in electron-proton, electron-nucleus, and ultraperipheral heavy-ion collisions. The framework relies on FONLL (Fixed-Order Next-to-Leading Logarith…

The GROND GRB sample: II. Fireball parameters for four GRB afterglows
Karla Varela, Jochen Greiner, Patricia Schady, Hendrik van Eerten
https://arxiv.org/abs/2507.09002

The GROND GRB sample: II. Fireball parameters for four GRB afterglows
Afterglows of GRBs are, in general, well described by the fireball model. Yet, deducing the full set of model parameters from observations without prior assumptions has been possible for only a handful of GRBs. With GROND, a 7-channel simultaneous optical and near-infrared imager at the 2.2m telescope of the Max-Planck Society at ESO/La Silla, a dedicated gamma-ray burst (GRB) afterglow observing program was performed between 2007 and 2016. Here, we combine GROND observations of four particul…

Could an axion-like particle be hidden in $\eta_c\to\gamma\gamma$?
Zhi-Jun Li, Zheng-Yun You, Xiao-Rui Lyu
https://arxiv.org/abs/2506.04144 https://…

Could an axion-like particle be hidden in $η_c\toγγ$?
We discuss the possibility of an axion-like particle being merged in the recent observation of $η_c \to γγ$ at BESIII and find that it cannot be excluded in the current experimental data. The mass, width, and coupling strengths of the axion-like particle are extracted, and several other channels to confirm or exclude the existence of such an axion-like particle are also discussed.

Prospects for the Detection of High-Redshift Gamma-Ray Bursts in the Era of EP and SVOM
Jun-Jie Wei, Xue-Feng Wu
https://arxiv.org/abs/2506.04709 https://

Prospects for the Detection of High-Redshift Gamma-Ray Bursts in the Era of EP and SVOM
Gamma-ray bursts (GRBs) are a promising probe of the high-redshift Universe, but their detection remains observationally challenging. In this work, we explore the detectability of high-$z$ GRBs by the Wide-field X-ray Telescope (WXT) aboard the Einstein Probe (\emph{EP}) and the coded-mask gamma-ray imager (ECLAIRs) aboard the Space-based multi-band astronomical Variable Objects Monitor (\emph{SVOM}). Using a population synthesis model calibrated to $Swift$ GRB observations, we develop a tool t…

Galactic Science -- Rapporteur Talk of the 8th Heidelberg International Symposium on High Energy Gamma Ray Astronomy
Sandro Mereghetti (INAF, IASF-Milano)
https://arxiv.org/abs/2506.04729

Galactic Science -- Rapporteur Talk of the 8th Heidelberg International Symposium on High Energy Gamma Ray Astronomy
The most recent observational and theoretical results in the rapidly expanding field of high-energy gamma-ray astrophysics were discussed at the international conference ``Gamma-2024'' that took place in Milano in September 2024. This contribution summarises the 'rapporteur talk' relative to the Galactic science given at the end of the conference.

Gamma/hadron discriminant variables in application to high-energy cosmic-ray air showers
Nataliia Borodai
https://arxiv.org/abs/2507.04546 https://

Gamma/hadron discriminant variables in application to high-energy cosmic-ray air showers
Identification of primary cosmic rays on an event-by-event basis is a much-desired capability of cosmic-ray observatories. Several cosmic-ray air-shower experiments use so-called photon tags for gamma hadron primary particle discrimination. These photon tag variables are derived from the total signals measured by an array of detectors and are correlated with the total number of muons in the air shower. In this work, variables based on time distribution of signals in detectors (trace-based discr…

First Constraint on Axion-Photon Coupling $g_{\gamma}$ from Neutron Star Observations
Jun-Chen Wang, Shunshun Cao, Jinchen Jiang, Yandong Liu, Qing-Hong Cao, Lijing Shao
https://arxiv.org/abs/2506.07546

First Constraint on Axion-Photon Coupling $g_γ$ from Neutron Star Observations
We propose a novel method to detect axions which uniquely depends on the dimensionless axion-photon coupling $g_γ$, independent of the suppressive axion decay constant $f_a$. Using neutron star PSR B1919+21 data from the Five-hundred-meter Aperture Spherical Telescope, we derive the first constraint $|g_γ|<0.93$ at $1σ$ confidence level for ultra-light axions ($m_a < 10^{-11}$ eV).

Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
S. Abe, J. Abhir, A. Abhishek, V. A. Acciari, A. Aguasca-Cabot, I. Agudo, T. Aniello, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, C. Arcaro, T. T. H. Arnesen, K. Asano, A. Babic, C. Bakshi, U. Barres de Almeida, J. A. Barrio, L. Barrios-Jimenez, I. Batkovic, J. Baxter, J. Becerra Gonzalez, W. Bednarek, E. Bernardini, J. Bernete, A. Berti, J. Besenrieder, C. Bigongiari, A. Biland…

Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
Gamma-ray bursts (GRBs) are the most powerful transient objects in the Universe, and they are a primary target for the MAGIC Collaboration. Recognizing the challenges of observing these elusive objects with Imaging Atmospheric Cherenkov Telescopes (IACTs), we implemented a dedicated observational strategy that included an automated procedure for rapid re-pointing to transient sources. Since 2013, this automated procedure has enabled MAGIC to observe GRBs at a rate of approximately ten per year,…

Anisotropic Diffusion of $e^\pm$ in Pulsar Halos over Multiple Coherence of Magnetic Field
Kai Yan, Sha Wu, Ruo-Yu Liu
https://arxiv.org/abs/2507.08526 htt…

Anisotropic Diffusion of $e^\pm$ in Pulsar Halos over Multiple Coherence of Magnetic Field
The slow particle diffusion in pulsar halos, inferred from TeV gamma-ray surface brightness profiles, is attributed to cross-field diffusion under the anisotropic diffusion model. This model assumes sub-Alfvénic interstellar turbulence in the surrounding medium of the pulsar and a rough alignment of the line-of-sight of observers towards the pulsars with the local mean magnetic field direction in the halo. In this model, the expected morphology of a pulsar halo is highly dependent on the prope…

This https://arxiv.org/abs/2408.07352 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Polarization Measurements as a Probe of Axion-Photon Coupling: a Study of GRB 221009A
Axion Like Particles (ALPs) can be produced in Gamma Ray Bursts, altering the polarization of the electromagnetic emission in these events. For the first time, we derive bounds on the axion-photon coupling from polarization measurements of GRB 221009A, performing a full calculation of the Stokes parameters, as it is typically done in the astrophysics community. Within astrophysical uncertainties, our limits on the axion-photon coupling are competitive with complementary probes in the axion mass…

A systematic study of binary neutron star merger rate density history using simulated gravitational wave and short gamma-ray burst observations
Yun-Fei Du, Emre Seyit Yorgancioglu, Shu-Xu Yi, Tian-Yong Cao, Shuang-Nan Zhang
https://arxiv.org/abs/2507.04019

A systematic study of binary neutron star merger rate density history using simulated gravitational wave and short gamma-ray burst observations
Measuring the merger rate density history of binary neutron stars (BNS) can greatly aid in understanding the history of heavy element formation in the Universe. Currently, second-generation Gravitational Wave (GW) detectors can only measure the BNS merger rate density history at low redshifts ($z$ $\sim$ 0.1). Short gamma-ray bursts (sGRBs) may trace the BNS merger to higher redshifts ($z$ $\sim$ 3). However, not all BNS mergers result in sGRBs, and it is not certain that all sGRBs originate fr…

20 GeV halo-like excess of the Galactic diffuse emission and implications for dark matter annihilation
Tomonori Totani
https://arxiv.org/abs/2507.07209 htt…

20 GeV halo-like excess of the Galactic diffuse emission and implications for dark matter annihilation
Fifteen years of the Fermi Large Area Telescope (LAT) data in the halo region of the Milky Way (MW) are analyzed to search for gamma rays from dark matter annihilation. Gamma-ray maps within the region of interest ($|l| \le 60$ deg, $10 \le |b| \le 60$ deg) are modeled using point sources, the GALPROP models of cosmic-ray interactions, isotropic background, and templates of Loop I and the Fermi bubbles, and then the presence of a halo-like component is further examined. A st…

Replaced article(s) found for astro-ph.HE. https://arxiv.org/list/astro-ph.HE/new
[1/1]:
- Gamma-ray burst pulse structures and emission mechanisms
A Gowri, A. Pe'er, F. Ryde, H. Dereli-B\'egu\'e

Hadronic origin of the very high-energy gamma-ray emission from the low-luminosity AGN in NGC 4278
Asahi Shoji, Yutaka Fujita, Norita Kawanaka, Susumu Inoue, Kosuke Nishiwaki
https://arxiv.org/abs/2507.02326

Hadronic origin of the very high-energy gamma-ray emission from the low-luminosity AGN in NGC 4278
The Large High Altitude Air Shower Observatory has detected very high-energy (VHE) gamma rays from NGC 4278, which is known to host a low-luminosity active galactic nucleus (AGN). Having only very weak radio jets, the origin of its VHE gamma rays is unclear. In this paper we first show that NGC 4278 has a massive molecular cloud surrounding the nucleus by analyzing data taken with the Atacama Large Millimeter/submillimeter Array. We then assume that cosmic ray protons are accelerated in a radia…

Catalog of very-high-energy emitting active galactic nuclei at high Galactic latitudes
A. Neronov, D. Semikoz
https://arxiv.org/abs/2506.08497 https://

Catalog of very-high-energy emitting active galactic nuclei at high Galactic latitudes
Large number of Active Galactic Nuclei (AGN) producing Very-High-Energy (VHE) gamma-rays (energies above 100~GeV) has been revealed using observations with Imaging Atmospheric Cherenkov Telescopes (IACTs). However, our knowledge of the VHE emitting AGN population is limited in the absence of an unbiased sky survey. We use long exposure of Fermi Large Area Telescope (LAT) to perform a survey of VHE emitting AGN at Galactic latitudes |b|>10 degrees. We consider clustering of gamma-ray e…

The role of dissipation distance on reconnection-driven multi-messenger signals from blazar jets
Stamatios Ilias Stathopoulos, Maria Petropoulou
https://arxiv.org/abs/2507.08680

The role of dissipation distance on reconnection-driven multi-messenger signals from blazar jets
Blazars are characterized by relativistic jets that are closely aligned with our line of sight. This results in relativistic beaming, making blazars among the most luminous extragalactic sources across the electromagnetic spectrum, from radio waves to gamma-rays and, potentially, in high-energy neutrinos. We present a comprehensive study of multi-messenger emission from blazar jets powered by magnetic reconnection occurring at varying distances from the supermassive black hole (SMBH). By genera…

The cosmic-ray sea explains the Galactic $\gamma$-ray and $\nu$ diffuse emissions from GeV to PeV
Pedro De La Torre Luque, Daniele Gaggero, Dario Grasso, Antonio Marinelli, Manuel Rocamora
https://arxiv.org/abs/2507.07083

The cosmic-ray sea explains the Galactic $γ$-ray and $ν$ diffuse emissions from GeV to PeV
The LHAASO collaboration has recently released the spectrum and the angular distribution of the gamma-ray Galactic diffuse emission from 1 TeV to 1 PeV measured with the Kilometer-2 Array (KM2A) and the Water Cherenkov Detector Array (WCDA). We show that those data are in remarkably good agreement with a set of pre-existing models that assume the emission to be produced by the Galactic population of cosmic rays if its spectral shape traces that measured by CALET, DAMPE as well as KASCADE at hig…

Measuring the Astrophysical Galactic Plane Neutrino Flux and Searching for Galactic PeVatrons using the IceCube Multi-Flavor Astrophysical Neutrino Sample
Matthias Thiesmeyer (for the IceCube Collaboration), Tianlu Yuan (for the IceCube Collaboration), Leo Seen (for the IceCube Collaboration), Lu Lu (for the IceCube Collaboration), Albrecht Karle (for the IceCube Collaboration)

Measuring the Astrophysical Galactic Plane Neutrino Flux and Searching for Galactic PeVatrons using the IceCube Multi-Flavor Astrophysical Neutrino Sample
The IceCube Neutrino Observatory has provided new insights into the high-energy universe, in particular, unveiling neutrinos from the galactic plane. However, galactic neutrino sources are still unresolved. The recent detection of multi-PeV photons by LHAASO from the Cygnus region highlights its potential as a galactic neutrino source. Additionally, LHAASO, HAWC, and HESS have reported over forty galactic gamma-ray sources with energies above 100 TeV. Detecting neutrinos correlated with high-en…

IceCube population constraints on neutrino emission by Fermi-LAT detected active galactic nuclei
Sam Hori (for the IceCube Collaboration), Abhishek Desai (for the IceCube Collaboration), Justin Vandenbroucke (for the IceCube Collaboration)
https://arxiv.org/abs/2507.07098

IceCube population constraints on neutrino emission by Fermi-LAT detected active galactic nuclei
Gamma-ray-bright active galactic nuclei (AGN) have been one of the most promising source classes of high-energy astrophysical neutrinos detected by IceCube. The first evidence of an IceCube point source was a blazar detected by the Fermi Large Area Telescope (LAT), TXS ~0506+056. Previous analyses have ruled out GeV-bright blazars as the predominant contributor to the high-energy astrophysical neutrino flux under simple correlation assumptions about the relationship between the fluxes of gamma …

Probing the sensitivity of CTAO-N LSTs observations at large zenith angles to the multi-TeV gamma-ray emission from the inner 10 parsecs of the Galactic Center
Shotaro Abe, Tomohiro Inada, Emmanuel Moulin
https://arxiv.org/abs/2506.04074

Probing the sensitivity of CTAO-N LSTs observations at large zenith angles to the multi-TeV gamma-ray emission from the inner 10 parsecs of the Galactic Center
Observations of the Galactic Center using Imaging Atmospheric Cherenkov Telescopes (IACTs), such as H.E.S.S., MAGIC, and VERITAS, have revealed a very-high-energy (VHE, $\gtrsim 100$ GeV) gamma-ray source, HESS J1745$-$290, aligned with the dynamical center of the Milky Way. This source shows point-like emission ($\lesssim 0.1^\circ$) and a strong suppression in its energy-differential spectrum in the ten TeV energy regime, modeled well by a power-law with an exponential cutoff. The origin of t…

A Leptonic Interpretation of the UHE Gamma-ray Emission from V4641 Sgr
Su-Yu Wan, Jie-shuang Wang, Ruo-Yu Liu
https://arxiv.org/abs/2507.02763 https://

A Leptonic Interpretation of the UHE Gamma-ray Emission from V4641 Sgr
Recently, the microquasar V4641 Sgr and its surrounding is detected at TeV-PeV gamma-ray band. Interestingly, the spectrum follows a power-law function continuing up to 0.8 PeV as reported by LHAASO, and the morphology of the emission appears a puzzling elongated structure. In this work, we propose that the elongated UHE emission from V4641 Sgr could originate from the inverse Compton radiation of electrons with a very hard spectrum, which may result from shear acceleration mechanism in the jet…

Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
SWGO Collaboration, et al.
https://arxiv.org/abs/2506.01786 https://

Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
Ground-based gamma-ray astronomy is now well established as a key observational approach to address critical topics at the frontiers of astroparticle physics and high-energy astrophysics. Whilst the field of TeV astronomy was once dominated by arrays of atmospheric Cherenkov Telescopes, ground-level particle detection has now been demonstrated to be an equally viable and strongly complementary approach. Ground-level particle detection provides continuous monitoring of the overhead sky, critical…

Exploring Year-timescale Gamma-ray Quasi-Periodic Oscillations in Blazars: Evidence for Supermassive Binary Black Holes Scenario
Ajay Sharma, Sakshi Chaudhary, Aishwarya Sarath, Debanjan Bose
https://arxiv.org/abs/2505.23697

Exploring Year-timescale Gamma-ray Quasi-Periodic Oscillations in Blazars: Evidence for Supermassive Binary Black Holes Scenario
A comprehensive analysis of quasi-periodic oscillations (QPOs) in the gamma-ray emissions of blazars. Utilizing 15 years of Fermi-LAT observations of seven blazars in our sample, we identify both long-term and transient quasi-periodic oscillations in the gamma-ray light curves, with timescales ranging from a few months to years. These periodicities were detected using the Lomb-Scargle periodogram and REDFIT techniques. To robustly evaluate the statistical significance of the quasi-periodic sign…

A period-increasing oscillation signal in a long gamma-ray burst
Tian-Ci Zheng, Stefano Covino, Yun Wang, Xiang-Dong Li, Da-Ming Wei, Zhi-Ping Jin
https://arxiv.org/abs/2507.00873

A period-increasing oscillation signal in a long gamma-ray burst
Gamma-ray bursts (GRBs), the brightest electromagnetic bursts in the universe, are believed to originate from ultra-relativistic jets launched by the rapidly rotating central engine, either a disk-surrounded newly formed black hole (BH) or a magnetar. Such a central engine potentially possesses rapidly evolving physical characteristics, as it is just born. The caught of time-increasing frequency in the gravitational wave signals is the evidence of upon opinion. Here we report a possible oscilla…

Resolving the origin of the unidentified TeV source HESS J1626-490 as a relic of the ancient cosmic-ray factory SNR G335.2 0.1
Tomohiko Oka, Wataru Ishizaki, Masaki Mori, Hidetoshi Sano, Hiromasa Suzuki, Takaaki Tanaka
https://arxiv.org/abs/2507.04407

Resolving the origin of the unidentified TeV source HESS J1626-490 as a relic of the ancient cosmic-ray factory SNR G335.2+0.1
While decades of observations in the TeV gamma-ray band have revealed more than 200~sources with radio or X-ray counterparts, there remain dozens of unidentified TeV sources, which may provide crucial information of cosmic ray (CR) accelerators. HESS J1626$-$490 is an unidentified TeV gamma-ray source but is expected to originate from CRs that escaped from the nearby supernova remnant (SNR) G335.2+0.1 and are interacting with dense interstellar clouds. To test this scenario, we scrutinize the p…

Search for spatial coincidences between galaxy mergers and Fermi-LAT 4FGL-DR4 sources
Siddhant Manna, Shantanu Desai
https://arxiv.org/abs/2507.03970 https…

Search for spatial coincidences between galaxy mergers and Fermi-LAT 4FGL-DR4 sources
We present a systematic search for spatial association between a high-confidence sample of 3,166 morphologically selected galaxy mergers detected through SDSS imaging and the 4FGL-DR4 catalog of gamma-ray sources detected by the Fermi Large Area Telescope (LAT). Using a conservative 4$σ$ positional uncertainty threshold and a Poisson-based statistical framework, we identify 21 statistically significant associations with match probabilities $p < 0.05$. Among these are known classes of gamma-ray…

Multi-Model Framework for Reconstructing Gamma-Ray Burst Light Curves
A. Kaushal, A. Manchanda, M. G. Dainotti, K. Gupta, Z. Nogala, A. Madhan, S. Naqi, Ritik Kumar, V. Oad, N. Indoriya, Krishnanjan Sil, D. H. Hartmann, M. Bogdan, A. Pollo, JX. Prochaska, N. Fraija
https://arxiv.org/abs/2506.23681

Multi-Model Framework for Reconstructing Gamma-Ray Burst Light Curves
Mitigating data gaps in Gamma-ray bursts (GRBs) light curves (LCs) holds immense value for its application in cosmological research because it provides more precise measurements of the parameter of interest of the two-dimensional Dainotti relation which is a relation among the end time of the plateau emission, Ta, its respective luminosity, La which is calculated from the fluxes at the end of the plateau, Fa. This study extends the work done by arXiv:2305.12126; arXiv:2412.20091v4 on the 545 GR…

Magnetic Burial in Millisecond Magnetars and Late GRB Afterglow Signatures
Nissim Fraija, Cristian Giovanni Bernal, Antonio Galv\'an, Boris Betancourt-Kamenetskaia, Maria Giovanna Dainotti
https://arxiv.org/abs/2506.09402

Magnetic Burial in Millisecond Magnetars and Late GRB Afterglow Signatures
Millisecond magnetars, one of the potential candidates for the central engine of Gamma-ray bursts (GRBs), can experience significant magnetic field enhancement shortly after their formation. In some cases, this evolution is further influenced by the accretion of stellar debris, which modifies the dipole magnetic field strength. During a hypercritical accretion phase that lasts seconds or longer after the progenitor explosion, a thin crust may form, submerging the magnetic field (the so-called m…

Jet precession in gamma-ray bursts: The roles of fallback accretion and disk dynamics
Yun-Peng Li, Da-Bin Lin, Guo-Yu Li, En-Wei Liang
https://arxiv.org/abs/2506.22043

Jet precession in gamma-ray bursts: The roles of fallback accretion and disk dynamics
The precession phenomenon of the jet in a gamma-ray burst (GRB) is a key probe of the physics of the central engine. Previous studies generally assumed a fixed precession period when analysing the temporal profiles in GRBs; however, the dynamic evolution of the fallback process and accretion disk can significantly affect the precession behaviour. In this work we present a jet precession model that incorporates the co-evolution of fallback accretion and the central black hole (BH). Our model dem…

This https://arxiv.org/abs/2502.00805 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Constraints on Lorentz Invariance Violation from Gamma-ray Burst rest-frame spectral lags using Profile Likelihood
We reanalyze the spectral lag data for 56 Gamma-Ray Bursts (GRBs) in the cosmological rest frame to search for Lorentz Invariance Violation (LIV) using frequentist inference. For this purpose, we use the technique of profile likelihood to deal with the nuisance parameters, corresponding to a constant time lag in the GRB rest frame and an unknown intrinsic scatter, while the parameter of interest is the energy scale for LIV ($E_{QG}$). With this method, we do not obtain a global minimum for $χ^…

Detailed Time Resolved Spectral and Temporal Investigations of SGR J1550-5418 Bursts Detected with Fermi/Gamma-ray Burst Monitor
Mustafa Demirer, Ersin G\"o\u{g}\"u\c{s}, Yuki Kaneko, \"Ozge Keskin, Sinem \c{S}a\c{s}maz, Shotaro Yamasaki
https://arxiv.org/abs/2506.04414

Detailed Time Resolved Spectral and Temporal Investigations of SGR J1550-5418 Bursts Detected with Fermi/Gamma-ray Burst Monitor
We have conducted a time-resolved spectral analysis of magnetar bursts originating from SGR J1550-5418. Our analysis utilizes a two-step methodology for temporal segmentation of the data. We first generated and fitted overlapping time segments. Subsequently, we obtained non-overlapping time segments with varying lengths based on their spectral evolution patterns, employing a machine learning algorithm called k-means clustering. For the fitting process, we employed three distinct models, namely …

Fast Luminous Extragalactic Transients in the VLA Sky Survey: Implications for the rates of Accretion-Induced Collapse Events, Fast Blue Optical Transients and Gamma Ray Burst Afterglows
Kritti Sharma, Vikram Ravi, Dillon Z. Dong, Gregg Hallinan, Casey Law, Delina Levine, Jean J. Somalwar, Jessie Miller, Nikita Kosogorov, Steven T. Myers
https://

Fast Luminous Extragalactic Transients in the VLA Sky Survey: Implications for the rates of Accretion-Induced Collapse Events, Fast Blue Optical Transients and Gamma Ray Burst Afterglows
Radio wavelengths offer a unique window into high-energy astrophysical phenomena that may be obscured or too rapidly evolving to be captured at other wavelengths. Leveraging data from the Very Large Array Sky Survey, we perform a systematic search for fast, luminous transients with characteristic timescales $\lesssim 3$ years in the nearby universe ($z \leq 0.3$). We report the discovery of five such transients, and classify them based on their synchrotron emission energetics and host galaxy pr…

Inferring Neutron Star Nuclear Properties from Gravitational-Wave and Gamma-Ray Burst Observations
Hsin-Yu Chen, Ore Gottlieb
https://arxiv.org/abs/2506.18151

Inferring Neutron Star Nuclear Properties from Gravitational-Wave and Gamma-Ray Burst Observations
Recent discoveries of long gamma-ray bursts accompanied by kilonova emission prompted interest in understanding their progenitors. If these long-duration bursts arise from neutron star mergers, similar to short gamma-ray bursts, it raises the question of which physical properties govern burst duration. The mass of the merger stands out as a key factor, strongly influencing the lifetime of the merger remnant, which in turn determines the burst duration: lighter mergers that form long-lived remna…

H.E.S.S. programme searching for VHE gamma rays associated with FRBs
F. Aharonian, A. Archaryya, J. Aschersleben, H. Ashkar, M. Backes, V. Barbosa. Martins, R. Batzofin, Y. Becherini, D. Berge, K. Bernl\"ohr, M. B\"ottcher, C. Boisson, J. Bolmont, M. de. Bony. de. Lavergne, J. Borowska, F. Bradascio, R. Brose, A. Brown, F. Brun, B. Bruno, C. Burger-Scheidlin, S. Casanova, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, J. Damascene. Mbarubucyeye…

H.E.S.S. programme searching for VHE gamma rays associated with FRBs
Fast Radio Bursts (FRBs) are highly energetic, extremely short-lived bursts of radio flashes. Despite extensive research, the exact cause of these outbursts remains speculative. The high luminosity, short duration, and high dispersion measure of these events suggest they result from extreme, high-energy extragalactic sources, such as highly magnetized and rapidly spinning neutron stars known as magnetars. The number of detected FRBs, including repeating ones, has grown rapidly in recent years. …

This https://arxiv.org/abs/2502.07888 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Gamma-ray emission from decays of boosted nuclei in protomagnetar jets
We examine the detectability of $γ$-ray emission originating from the radioactive decays of unstable nuclei that are synthesized in relativistic outflows launched in magnetorotational core-collapse supernovae. The observed lines have enhanced energies due to the Lorentz boosted nuclei and can also be seen until later times due to time dilation of the rest-frame half-lives. We find that instruments like \textit{e-ASTROGAM} and \textit{INTEGRAL/SPI} are sensitive to these boosted line emissions …

This https://arxiv.org/abs/2411.07035 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Inferring jet physics from neutron star - black hole mergers with gravitational waves
Neutron star - black hole (NSBH) mergers that undergo tidal disruption may launch jets that could power a gamma-ray burst. We use a population of simulated NSBH systems to measure jet parameters from the gravitational waves emitted by these systems. The conditions during the tidal disruption and merger phase required to power a gamma-ray burst are uncertain. It is likely that the system must achieve some minimum remnant baryonic mass after the merger before a jet can be launched to power a gamm…

This https://arxiv.org/abs/2412.20091 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Gamma-Ray Burst Light Curve Reconstruction: A Comparative Machine and Deep Learning Analysis
Gamma-Ray Bursts (GRBs), observed at large redshifts, are probes of the evolution of the Universe and can be used as cosmological tools. To this end, we need tight (with small dispersion) correlations among key parameters. To reduce such a dispersion, we will mitigate gaps in light curves (LCs), including the plateau region, key to building the two-dimensional Dainotti relation between the end time of plateau emission (Ta) to its luminosity (La). We reconstruct LCs using nine models: Multi-Laye…

The peak flux of long gamma-ray bursts in the E$_{\rm p,i}$--L$_{\rm iso}$ diagram and in the classification
Guangxuan Lan, Jean-Luc Atteia
https://arxiv.org/abs/2506.20374

The peak flux of long gamma-ray bursts in the E$_{\rm p,i}$--L$_{\rm iso}$ diagram and in the classification
The E$_{\rm p,i}$--L$_{\rm iso}$ correlation of long gamma-ray bursts (LGRBs) is regarded as a fundamental correlation for standardizing LGRBs to probe cosmology and constrain LGRB physics. However, this correlation may be affected by potential selection effects which are likely overlooked in the current small LGRB redshift sample. In this work, we simulate a large LGRB sample that reflects the observed situation, aiming to study the impact of peak flux $P$ on the observed LGRB E$_{\rm p,i}$--L…