Tootfinder

Extractivism comes back to Europe as mineral demands are set to rocket.
The only way is to use far less energy.
#degrowth
Europe’s lithium rush leaves mineral-rich communities in the dark

Europe’s lithium rush leaves mineral-rich communities in the dark
Some local residents say they haven't been adequately consulted before the rollout of Europe's lithium plans and fear for their incomes

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 …

Two coincidences are a clue: Probing a GeV-scale dark QCD sector
Yi Chung
https://arxiv.org/abs/2506.10928 https://arxiv.org/pdf/2506…

Two coincidences are a clue: Probing a GeV-scale dark QCD sector
The similarity between dark matter and baryon energy densities suggests the existence of a dark sector analogous to the visible QCD sector. In addition, small-scale structure issues can be addressed by dark matter self-interactions with a cross section comparable to that of QCD. Both observations point to a GeV-scale dark QCD sector. In this letter, guided by these two coincidences, we investigate how a chiral dark QCD model with a MeV-scale dark photon can resolve the core-cusp problem. A pote…

Goth attire is dark & has spiderwebs because it goes with everything & we haven't had the energy to go out in years and the spiders made a mess

The modern standard model of cosmology is a triumph of the scientific process.
On the other hand, it’s also kind of a kludge.
The modern standard model seems to glue together a bunch of disparate parts without any overarching theoretical structure.
Take inflation and dark energy.
In both cases, we have a form of pervasive energy that pushes space apart.
Inflation does it really fast and then dissipates.
Dark energy does it much slower and does not dissipate…

Our standard model of cosmology is both a triumph and a jumbled mess
The standard model of cosmology is very successful, but cosmologists are largely still in the dark about the forces that drive the Universe.

Computing Nonlinear Power Spectra Across Dynamical Dark Energy Model Space with Neural ODEs
Peter L. Taylor
https://arxiv.org/abs/2506.09128 https://

Computing Nonlinear Power Spectra Across Dynamical Dark Energy Model Space with Neural ODEs
I show how to compute the nonlinear power spectrum across the entire $w(z)$ dynamical dark energy model space. Using synthetic $Λ$CDM data, I train a neural ordinary differential equation (ODE) to infer the evolution of the nonlinear matter power spectrum as a function of the background expansion and mean matter density across $\sim$$9 {\rm \ Gyr}$ of cosmic evolution. After training, the model generalises to {\it any} dynamical dark energy model parameterised by $w(z)$. With little optimisati…

I think a tram is coming from behind.

Topological defects as effective dynamical dark energy
Haipeng An, Chengcheng Han, Borui Zhang
https://arxiv.org/abs/2506.10075 https://

Topological defects as effective dynamical dark energy
In this work, we consider the possibility that the dynamical dark energy hinted at by recent DESI data may be mimicked by the effects of additional components in the universe, potentially arising from topological defects. We find that the data does not show a particular preference for the existence of cosmic strings. However, a domain wall contribution at the percent level can improve the fit, yielding a $Δχ^2= -1.72$ compared to the $Λ\rm{CDM}$ model. The improvement indicates that topologi…

Dynamical Dark Energy from $F(R)$ Gravity Models Unifying Inflation with Dark Energy: Confronting the Latest Observational Data
S. D. Odintsov, V. K. Oikonomou, G. S. Sharov
https://arxiv.org/abs/2506.02245

Dynamical Dark Energy from $F(R)$ Gravity Models Unifying Inflation with Dark Energy: Confronting the Latest Observational Data
A class of viable $F(R)$ gravity models which can provide a unified description of inflation with the dark energy era is confronted with the latest observational data on the dark energy era. These models have the unique characteristic that the de Sitter scalaron mass in the Einstein frame counterpart theory is a monotonic function of the curvature, which renders them viable descriptions for both the inflationary and the late-time acceleration eras. We also compare these models with other well-k…

Observation of a low energy nuclear recoil peak in the neutron calibration data of an Al$_{2}$O$_{3}$ crystal in CRESST-III
CRESST Collaboration, G. Angloher, S. Banik, A. Bento, A. Bertolini, R. Breier, C. Bucci, L. Burmeister, F. Casadei, E. Cipelli, J. Burkhart, L. Canonica, J. Dohm, F. Dominsky, S. Di Lorenzo, L. Einfalt, A. Erb, E. Fascione, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, V. M. Ghete, P. Gorla, P. V. Guillaumon, D. Hauff, M. Je\v{s}kovsk\'y, J. Jochum, M. Kaznachee…

Observation of a low energy nuclear recoil peak in the neutron calibration data of an Al$_{2}$O$_{3}$ crystal in CRESST-III
The current generation of cryogenic solid state detectors used in direct dark matter and CE\textnu NS searches typically reach energy thresholds of $\mathcal{O}$(10)$\,$eV for nuclear recoils. For a reliable calibration in this energy regime a method has been proposed, providing mono-energetic nuclear recoils at low energies $\sim\,$100$\,$eV$\,$-$\,$1$\,$keV. In this work we report on the observation of a peak at (1113.6$^{+6.5}_{-6.5}$)$\,$eV in the data of an Al$_{2}$O$_{3}$ crystal in CRESS…

Is non-zero equation of state of dark matter favored by DESI DR2?
Tian-Nuo Li, Yi-Min Zhang, Yan-Hong Yao, Peng-Ju Wu, Jing-Fei Zhang, Xin Zhang
https://arxiv.org/abs/2506.09819

Is non-zero equation of state of dark matter favored by DESI DR2?
The nature of dark matter remains one of the most fundamental and unresolved questions in modern cosmology. In most cosmological models, dark matter is typically modeled as pressureless dust with an equation of state (EoS) parameter $w_{\rm dm} = 0$. However, there is no fundamental theoretical reason to exclude the possibility of a non-zero dark matter EoS parameter. In this work, we explore the possibility of a non-zero dark matter EoS within the phenomenologically emergent dark energy (PEDE)…

Is there a more perfect illustration of capitalism at work? https://www.theguardian.com/environment/2025/jun/01/dark-roof-lobby

Light Dark Matter Detection with Sub-eV Transition-Edge Sensors
Muping Chen, Volodymyr Takhistov, Kazunori Nakayama, Kaori Hattori
https://arxiv.org/abs/2506.10070

Light Dark Matter Detection with Sub-eV Transition-Edge Sensors
We present a comprehensive analysis of high-resolution transition-edge sensors (TESs) as a quantum sensing platform for detecting dark matter (DM). Operating near the thermodynamic noise limit with sub-eV energy resolution, TESs offer a powerful approach for probing light DM in the sub-GeV mass range. Optical TESs, realized on superconducting films with critical temperatures below 150 mK, achieve energy thresholds below 100 meV and enable precise calorimetric detection of individual energy depo…

The DECam Field of Streams: a deep view of the Milky Way halo
Peter Ferguson, Nora Shipp
https://arxiv.org/abs/2506.05469 https://arx…

The DECam Field of Streams: a deep view of the Milky Way halo
We present a Field of Streams visualizing stellar structures in the Milky Way halo as viewed by the Dark Energy Camera (DECam). We use $g$- and $r$-band imaging from the Dark Energy Survey and the DECam Legacy Survey, covering $18{,}700 °^2$ across the sky. Using an isochrone-based matched filter in $g$ vs. $g-r$, we select old and metal-poor stars in three distance bins, and generate a false-color RGB image of the number density of selected stars. The DECam Field of Streams shows a variety of…

The Highest-Energy Neutrino Event Constrains Dark Matter-Neutrino Interactions
Toni Bert\'olez-Mart\'inez, Gonzalo Herrera, Pablo Mart\'inez-Mirav\'e, Jorge Terol Calvo
https://arxiv.org/abs/2506.08993

The Highest-Energy Neutrino Event Constrains Dark Matter-Neutrino Interactions
Dark Matter-neutrino interactions affect the propagation of astrophysical neutrinos, attenuating the flux of neutrinos arriving at Earth. Using the highest-energy neutrino event detected to date by the KM3NeT collaboration as an example, and assuming an extragalactic origin, we derive limits on these interactions at $E_ν= 220^{+570}_{-110}\, \mathrm{PeV}$. Considering only the propagation on the Milky Way Dark Matter halo, we constrain the interaction cross section over the mass of the Dark Ma…

Integrated Galaxy Light from Stacking $10^5$ Random Pointings in the Dark Energy Survey Data
Jenna E. Moore, Seth H. Cohen, Philip Mauskopf, Evan Scannapieco
https://arxiv.org/abs/2506.08162

Integrated Galaxy Light from Stacking $10^5$ Random Pointings in the Dark Energy Survey Data
We present a new technique for measuring the integrated galaxy light (IGL) with stacked image data from the Dark Energy Survey (DES). We extract $1\times1$ arcminute cutouts from nearly 100,000 randomly selected positions in the g, r, i, z, and Y bands from the DES data release 2 (DR2) maps. We generate source catalogs and masks for each cutout and the images are subsequently stacked to generate deep images of the sky both with and without sources. The IGL is then calculated by taking the diffe…

Constraints on Barrow and Tsallis Holographic Dark Energy from DESI DR2 BAO data
Giuseppe Gaetano Luciano, Andronikos Paliathanasis, Emmanuel N. Saridakis
https://arxiv.org/abs/2506.03019

Constraints on Barrow and Tsallis Holographic Dark Energy from DESI DR2 BAO data
Barrow and Tsallis Holographic Dark Energy (HDE) are two recently proposed extensions of the standard HDE framework, incorporating generalized corrections to horizon entropy through the use of Barrow and Tsallis entropies. Tsallis entropy arises from non-extensive statistical phenomena which account for long-range correlations and deviations from additivity, while Barrow entropy emerges from quantum-gravitational effects on the horizon geometry, associated with fractal modifications and deforma…

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…

Constraints on cosmology and baryonic feedback with joint analysis of Dark Energy Survey Year 3 lensing data and ACT DR6 thermal Sunyaev-Zel'dovich effect observations
S. Pandey, J. C. Hill, A. Alarcon, O. Alves, A. Amon, D. Anbajagane, F. Andrade-Oliveira, N. Battaglia, E. Baxter, K. Bechtol, M. R. Becker, G. M. Bernstein, J. Blazek, S. L. Bridle, E. Calabrese, H. Camacho, A. Campos, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, C. Chang, R. Chen, P. Chintalapati, A. Choi, J. C…

Constraints on cosmology and baryonic feedback with joint analysis of Dark Energy Survey Year 3 lensing data and ACT DR6 thermal Sunyaev-Zel'dovich effect observations
We present a joint analysis of weak gravitational lensing (shear) data obtained from the first three years of observations by the Dark Energy Survey and thermal Sunyaev-Zel'dovich (tSZ) effect measurements from a combination of Atacama Cosmology Telescope (ACT) and Planck data. A combined analysis of shear (which traces the projected mass) with the tSZ effect (which traces the projected gas pressure) can jointly probe both the distribution of matter and the thermodynamic state of the gas, accou…

Photometric redshift estimation for emission line galaxies of DESI Legacy Imaging Surveys by CNN-MLP
Shirui Wei, Changhua Li, Yanxia Zhang, Chenzhou Cui, Chao Tang, Jingyi Zhang, Yongheng Zhao, Xuebing Wu, Yihan Tao, Dongwei Fan, Shanshan Li, Yunfei Xu, Maoyuan Huang, Xingyu Yang, Zihan Kang, Jinghang Shi
https://arxiv.org/abs/2…

Photometric redshift estimation for emission line galaxies of DESI Legacy Imaging Surveys by CNN-MLP
Emission Line Galaxies (ELGs) are crucial for cosmological studies, particularly in understanding the large-scale structure of the Universe and the role of dark energy. ELGs form an essential component of the target catalogue for the Dark Energy Spectroscopic Instrument (DESI), a major astronomical survey. However, the accurate selection of ELGs for such surveys is challenging due to the inherent uncertainties in determining their redshifts with photometric data. In order to improve the accurac…

This https://arxiv.org/abs/2502.04080 has been replaced.
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AT 2018dyk: tidal disruption event or active galactic nucleus? Follow-up observations of an extreme coronal line emitter with the Dark Energy Spectroscopic Instrument
We present fresh insights into the nature of the tidal disruption event (TDE) candidate AT 2018dyk. AT 2018dyk has sparked a debate in the literature around its classification as either a bona-fide TDE or as an active galactic nucleus (AGN) turn-on state change. A new follow-up spectrum taken with the Dark Energy Spectroscopic Instrument, in combination with host-galaxy analysis using archival SDSS-MaNGA data, supports the identification of AT 2018dyk as a TDE. Specifically, we classify this ob…

This https://arxiv.org/abs/2412.11569 has been replaced.
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The dark side of the forces: assessing non-conservative force models for atomistic machine learning
The use of machine learning to estimate the energy of a group of atoms, and the forces that drive them to more stable configurations, has revolutionized the fields of computational chemistry and materials discovery. In this domain, rigorous enforcement of symmetry and conservation laws has traditionally been considered essential. For this reason, interatomic forces are usually computed as the derivatives of the potential energy, ensuring energy conservation. Several recent works have questioned…

This https://arxiv.org/abs/2503.19428 has been replaced.
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S-dual Quintessence, the Swampland, and the DESI DR2 Results
We propose a dark energy model in which a quintessence field $ϕ$ rolls near the vicinity of a local maximum of its potential characterized by the simplest $S$ self-dual form $V(ϕ) = Λ\ {\rm sech}(\sqrt{2} \, ϕ/M_p)$, where $M_p$ is the reduced Planck mass and $Λ\sim 10^{-120} M_p^4$ is the cosmological constant. We confront the model with Swampland ideas and show that the $S$-dual potential is consistent with the distance conjecture, the de Sitter conjecture, and the trans-Planckian censor…

Gravothermal expansion of dwarf spheroidal galaxies heated by dark subhaloes
Jorge Pe\~narrubia, Rapha\"el Errani, Eduardo Vitral, Matthew G. Walker
https://arxiv.org/abs/2506.03904

Gravothermal expansion of dwarf spheroidal galaxies heated by dark subhaloes
We use analytical and $N$-body methods to study the evolution of dwarf spheroidal galaxies (dSphs) embedded in dark matter (DM) haloes that host a sizeable subhalo population. Dark subhaloes generate a fluctuating gravitational field that injects energy into stellar orbits, driving a gradual expansion of dSphs. Despite the overall expansion, the stellar density profile preserves its initial shape, suggesting that the evolution proceeds in a self-similar manner. Meanwhile, the velocity dispersio…

Challenging Spontaneous Quantum Collapse with XENONnT
E. Aprile, J. Aalbers, K. Abe, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, D. Ant\'on Martin, S. R. Armbruster, F. Arneodo, L. Baudis, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, K. Boese, A. Brown, G. Bruno, R. Budnik, C. Cai, C. Capelli, J. M. R. Cardoso, A. P. Cimental Ch\'avez, A. P. Colijn, J. Conrad, J. J. Cuenca-Garc\'ia, C. Curceanu, V. D'Andrea, L. C. Daniel Garcia, M. P. Decowski, A. Deist…

Challenging Spontaneous Quantum Collapse with XENONnT
We report on the search for X-ray radiation as predicted from dynamical quantum collapse with low-energy electronic recoil data in the energy range of 1-140 keV from the first science run of the XENONnT dark matter detector. Spontaneous radiation is an unavoidable effect of dynamical collapse models, which were introduced as a possible solution to the long-standing measurement problem in quantum mechanics. The analysis utilizes a model that for the first time accounts for cancellation effects i…

$w_{dm}$-$w_{de}$ cosmological model with new data samples of cosmological observations
Dorian Araya, Cristian Castillo, Genly Leon, Juan Maga\~na, Angie Barr Dom\'inguez, Miguel A. Garc\'ia-Aspeitia
https://arxiv.org/abs/2506.09281

$w_{dm}$-$w_{de}$ cosmological model with new data samples of cosmological observations
We revisit a cosmological model where dark matter (DM) and dark energy (DE) follow barotropic equations of state, allowing deviations from the standard $Λ$CDM framework (i.e. $w_{dm} \neq 0$, $w_{de} \neq -1$) considering both, flat and non-flat curvature. Using a dynamical system approach, we identify equilibrium states that govern stability, expansion, and contraction. Expansion occurs when $H>0$, while contraction is linked to $H < 0$. Accelerated expansion arises from DE dominance, whereas…

Quintessence dark energy model in non-linear $f(Q)$ theory with bulk-viscosity
Dinesh Chandra Maurya
https://arxiv.org/abs/2506.02543 https://

Quintessence dark energy model in non-linear $f(Q)$ theory with bulk-viscosity
In this study, we investigate a locally rotationally symmetric (LRS) Bianchi type-I cosmological model in non-linear form of $f(Q)$ gravity with observational constraints. We solved the modified Einstein's field equations with a viscous fluid source and got a hyperbolic solution. First, we apply MCMC analysis to the cosmic chronometer (CC) and Pantheon datasets to place observational constraints on model parameters. Using approximated model parameters, we study the cosmological parameters, such…

Search for dark matter produced in association with a Higgs boson decaying to a $\tau$ lepton pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2506.04431

Search for dark matter produced in association with a Higgs boson decaying to a $τ$ lepton pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for dark matter particles produced in association with a Higgs boson decaying into a pair of $τ$ leptons is performed using data collected in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector. The analysis is based on a data set corresponding to an integrated luminosity of 101 fb$^{-1}$ collected in 2017$-$2018. No significant excess over the expected standard model background is observed. This result is interpreted within the frameworks of the 2HDM+a…

The effective running Hubble constant in SNe Ia as a marker for the dark energy nature
E. Fazzari, M. G. Dainotti, G. Montani, A. Melchiorri
https://arxiv.org/abs/2506.04162

The effective running Hubble constant in SNe Ia as a marker for the dark energy nature
We propose a new method that reveal the nature of dark energy (DE) evolution. Specifically, the method consists of studying the evolving trend regarding the effective running Hubble constant: when it increases, it indicates a quintessence nature, and when it decreases, it reveals a phantom behavior. Within the framework of the dark energy models we analyze three parameterizations: the $w$CDM model, a reduced Chevallier-Polarski-Linder (CPL) model and a new theoretical model based on the possibl…

Diffuse astrophysical neutrinos from dark matter around blazars
Andrea Giovanni De Marchi, Alessandro Granelli, Jacopo Nava, Filippo Sala
https://arxiv.org/abs/2506.06416

Diffuse astrophysical neutrinos from dark matter around blazars
Neutrinos from blazars can originate from inelastic scatterings between protons within their jets and sub-GeV dark matter (DM) around them, explaining IceCube detections of neutrinos from TXS 0506+056 that are otherwise challenging for models of its jet. In this paper we calculate such DM-induced high-energy neutrinos, from TXS 0506+056 as well as from a stacked blazar sample, in the four cases where DM-quark interactions are mediated by a new massive vector, axial, scalar, and pseudoscalar par…

This https://arxiv.org/abs/2504.06290 has been replaced.
initial toot: https://mastoxiv.page/@arX…

A DESI universe with time-dependent dark energy is 119 Myr younger than a LambdaCDM universe
On the basis of their redshift and Lyman-alpha measurements, the Dark Energy Spectroscopic Instrument (DESI) collaboration suggest that dark energy varies with the scale factor $a$ as $ ρ_{de}(a)={} \, a^{-3(1 + w_0 + w_a)} e^{-3 w_a (1-a)}ρ_{de,0} $ in which $w_0 = - 0.752 \pm 0.057$ and $w_a ={} - 0.86^{+0.23}_{-0.20} $. Such a DESI universe is 119 Myr younger than the LambdaCDM universe.

This https://arxiv.org/abs/2501.08524 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Deep inference of simulated strong lenses in ground-based surveys
The large number of strong lenses discoverable in future astronomical surveys will likely enhance the value of strong gravitational lensing as a cosmic probe of dark energy and dark matter. However, leveraging the increased statistical power of such large samples will require further development of automated lens modeling techniques. We show that deep learning and simulation-based inference (SBI) methods produce informative and reliable estimates of parameter posteriors for strong lensing syste…

Observational Insights on DBI K-essence Models Using Machine Learning and Bayesian Analysis
Samit Ganguly, Arijit Panda, Eduardo Guendelman, Debashis Gangopadhyay, Abhijit Bhattacharyya, Goutam Manna
https://arxiv.org/abs/2506.05674

Observational Insights on DBI K-essence Models Using Machine Learning and Bayesian Analysis
We present a comparative observational data analysis of two DBI-type k-essence scalar field models for late-time cosmic acceleration: one treats dark energy with standard matter, while the other unifies dark energy and dark matter within a single scalar field, each governed by distinct non-canonical Lagrangians. The background dynamics are formulated via modified Friedmann and scalar field equations, constrained by Pantheon+ SNe Ia, Hubble, and BAO data, using Bayesian inference (NUTS in NumPyr…

This https://arxiv.org/abs/2506.01889 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

I-Love-Q relations for Neutron Stars with Dark Energy
We studied the effect of a dark energy fluid in the equation of state of neutron stars. For such models, we performed a detailed analysis, computing the moment of inertia, the quadrupole moment, and the tidal Love number. We then proved that these quantities are linked to each other with the well-known equation of state independent relations, the I-Love-Q relations. This study expands the range of validity of such relations to new models of neutron stars.

This https://arxiv.org/abs/2406.13638 has been replaced.
initial toot: https://mastoxiv.page/@ar…

XENONnT WIMP Search: Signal & Background Modeling and Statistical Inference
The XENONnT experiment searches for weakly-interacting massive particle (WIMP) dark matter scattering off a xenon nucleus. In particular, XENONnT uses a dual-phase time projection chamber with a 5.9-tonne liquid xenon target, detecting both scintillation and ionization signals to reconstruct the energy, position, and type of recoil. A blind search for nuclear recoil WIMPs with an exposure of 1.1 tonne-years (4.18 t fiducial mass) yielded no signal excess over background expectations, from which…

Constraining Dark Matter Parameters in the Lambda-CDM Framework: A Bayesian Comparison of Planck and DES Constraints
Manjeet Kunwar, Nabin Bhusal, Manil Khatiwada, Niraj Dhital
https://arxiv.org/abs/2506.07133

Constraining Dark Matter Parameters in the Lambda-CDM Framework: A Bayesian Comparison of Planck and DES Constraints
We present a Bayesian analysis of cosmological parameter constraints from early- and late-universe observations, focusing on the matter density parameter ($Ω_m$) and the amplitude of matter fluctuations ($σ_8$) within the $Λ$CDM framework. Using data from the Planck 2018 satellite mission and the Dark Energy Survey (DES) Year 3, we compute theoretical predictions for angular and matter power spectra via Boltzmann solvers and perform Markov Chain Monte Carlo (MCMC) sampling using the \texttt{…

Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
Denys Malyshev, Lidiia Zadorozhna, Yuriy Bidasyuk, Andrea Santangelo, Oleg Ruchayskiy
https://arxiv.org/abs/2506.02848

Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
Hypothetical axion-like particles (ALPs) are of interest because of their potential to act as dark matter or to reveal information about yet undiscovered fundamental constituents of matter. Such particles can be created when photons traverse regions of magnetic fields. The conversion probability depends on both the magnetic field parameters and photon energy, leading to multiple spectral absorption features as light passes through magnetized regions. Traditionally, astrophysical searches have…

This https://arxiv.org/abs/2502.13002 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Inverse Seesaw Mechanism and Axion Portal Fermionic Dark Matter
We propose a minimal extension of the Standard Model (SM) that addresses both the smallness of neutrino masses and the dark matter (DM) puzzle via the inverse seesaw mechanism and an axion portal fermionic DM. This model generates light neutrino masses without requiring high energy scales, enhancing its testability in future collider experiments. An axion-like particle (ALP) connects the SM and DM sectors, yielding a distinct phenomenology. Our analysis shows that the model is consistent with c…

This https://arxiv.org/abs/2408.08740 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Anisotropic universe with anisotropic dark energy
We investigate the anisotropic parameterization of the dark energy equation of state within the framework of an axisymmetric (planar) Bianchi-I universe. Using the latest Pantheon+ Type Ia Supernova dataset, augmented by SH0ES Cepheid distance calibrators, we constrain both the equation of state for anisotropic dark energy and other standard cosmological parameters. Additionally, we examine the presence of an underlying anisotropic axis. Our analysis yields a mean anisotropic dark energy equati…

This https://arxiv.org/abs/2503.18158 has been replaced.
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New constraints on cosmic ray-boosted dark matter from the LUX-ZEPLIN experiment
While dual-phase xenon time projection chambers (TPCs) have driven the sensitivity towards weakly interacting massive particles (WIMPs) at the GeV/c^2 to TeV/c^2 mass scale, the scope for sub-GeV/c^2 dark matter particles is hindered by a limited nuclear recoil energy detection threshold. One approach to probe for lighter candidates is to consider cases where they have been boosted by collisions with cosmic rays in the Milky Way, such that the additional kinetic energy lifts their induced signa…

This https://arxiv.org/abs/2408.11158 has been replaced.
initial toot: https://mastoxiv.page/@ar…

A Transition Edge Sensor Operated in Coincidence with a High Sensitivity Athermal Phonon Sensor for Photon Coupled Rare Event Searches
Experimental searches for axions or dark photons that couple to the standard model photon require photosensors with low noise, broadband sensitivity, and near zero backgrounds. Here, we introduce an experimental architecture, in which a small photon sensor, in our case a Transition Edge Sensor (TES) with a photon energy resolution $σ_γ= 368.4 \pm 0.4$ meV, is colocated on the same substrate as a large high sensitivity athermal phonon sensor (APS) with a phonon energy resolution $σ_\mathrm{ph…

Dynamical dark energy in the no-scale Brans-Dicke gravity
Muzi Hong, Kyohei Mukaida, Tsutomu T. Yanagida
https://arxiv.org/abs/2506.01543 https://

Dynamical dark energy in the no-scale Brans-Dicke gravity
We add a new scalar field in the no-scale Brans-Dicke gravity and require it to have a global O(2) symmetry with the original scalar field in the Brans-Dicke gravity. This gives us a new massless scalar field in the Einstein frame due to the SO(2) symmetry. We then explicitly break the O(2) symmetry to a $D_4$ symmetry, and this scalar field gains a periodic potential. This scalar field can serve as the quintessence field to explain dark energy. If we further add the $R^2$ term and the non-mini…

This https://arxiv.org/abs/2310.03697 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Onset of dark energy from cosmological scalarization and gravitational wave speed
This study investigates the emergence of dark energy during the matter-dominated era through spontaneous cosmological scalarization in the scalar-Ricci-Gauss-Bonnet model.Our model aligns with the conjecture that the speed of gravitational waves at low redshifts is nearly equal to the speed of light, implying that the Gauss-Bonnet invariant does not directly contribute to late-time acceleration and suggesting that scalarization begins in the radiation-dominated era. The Gauss-Bonnet coupl…

This https://arxiv.org/abs/2505.20358 has been replaced.
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Is GGAG:Ce@SiO$_2$-RB composite a prospective material for X-ray induced photodynamic therapy?
Nanocomposite material ($\mathrm{GGAG:Ce^{3+}@SiO_2-RB}$) for potential use in X-ray induced photodynamic therapy (X-PDT) was developed, thoroughly characterized, and evaluated. It consists of a scintillating $\mathrm{Gd_3(Ga_{1-x}Al_x)_5O_{12}:Ce^{3+}}$ core encapsulated in silica layer and functionalized with the photosensitizer Rose Bengal (RB). Radioluminescence measurements confirmed the energy transfer from the scintillating core to Rose Bengal. Dark toxicity and radiosensitisation effect…

Initial Characterization of Stellar Photometry of Roman images from the OpenUniverse Simulations
Lauren Aldoroty, Daniel Scolnic, Arun Kannawadi, Rob Knop, Benjamin Rose, Rebekah Hounsell, Michael Troxel
https://arxiv.org/abs/2506.04332

Initial Characterization of Stellar Photometry of Roman images from the OpenUniverse Simulations
NASA's Nancy Grace Roman Space Telescope (Roman) will provide an opportunity to study dark energy with unprecedented precision and accuracy using several techniques, including measurements of high-$z$ Type Ia Supernovae (SNe Ia, $z \lesssim 3.0$) via the High-Latitude Time Domain Survey (HLTDS). In this work, we do an initial "benchmark" characterization of the photometric repeatability of stellar fluxes, which must be below $1\%$ when sky noise is subdominant in order xto enable a number of ca…

A Bayesian PINN Framework for Barrow-Tsallis Holographic Dark Energy with Neutrinos: Toward a Resolution of the Hubble Tension
Muhammad Yarahmadi, Amin Salehi
https://arxiv.org/abs/2506.02235

A Bayesian PINN Framework for Barrow-Tsallis Holographic Dark Energy with Neutrinos: Toward a Resolution of the Hubble Tension
We investigate the Barrow-Tsallis Holographic Dark Energy (BTHDE) model using both traditional Markov Chain Monte Carlo (MCMC) methods and a Bayesian Physics-Informed Neural Network (PINN) framework, employing a range of cosmological observations. Our analysis incorporates data from Cosmic Microwave Background (CMB), Baryon Acoustic Oscillations (BAO), CMB lensing, Cosmic Chronometers (CC), and the Pantheon+ Type Ia supernova compilation. We focus on constraining the Hubble constant $ H_0 $, th…

This https://arxiv.org/abs/2502.04053 has been replaced.
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Proof of principle for a light dark matter search with low-energy positron beams at NA64
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. In this picture, a new feeble interaction acts as a "portal" between the Standard Model and LDM particles, allowing for the exploration of this paradigm at accelerator experiments. In the last years, the "missing energy" experiment NA64e at CERN SPS (Super Proton Synchrotron) has set world-leading constraints in th…

Uplifting, Depressing, and Tilting Dark Energy
Eric V. Linder
https://arxiv.org/abs/2506.02122 https://arxiv.org/pdf/2506.02122

Uplifting, Depressing, and Tilting Dark Energy
Current data in the form of baryon acoustic oscillation, supernova, and cosmic microwave background distances prefer a cosmology that accelerates more strongly than $Λ$CDM at $z\approx0.5-1.5$, and more weakly at $z\lesssim0.5$. We examine dark energy physics that can accommodate this, showing that interactions (decays, coupling to matter, nonminimal coupling to gravity) fairly generically tend not to give a satisfactory solution (in terms of fitting both distances and growth) even if they ena…

This https://arxiv.org/abs/2412.15383 has been replaced.
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DESI Mg II Absorbers: Extinction Characteristics & Quasar Redshift Accuracy
In this paper, we study how absorption-line systems affect the spectra and redshifts of quasars (QSOs), using catalogs of Mg II absorbers from the early data release (EDR) and first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI). We determine the reddening effect of an absorption system by fitting an un-reddened template spectrum to a sample of 50,674 QSO spectra that contain Mg II absorbers. We find that reddening caused by intervening absorbers (voff > 3500 km/s) has an…

Parity violation in photon quasinormal modes of black holes
Sugumi Kanno, Jiro Soda, Akira Taniguchi
https://arxiv.org/abs/2506.04149 https://

Parity violation in photon quasinormal modes of black holes
Given that black holes are ubiquitous in the universe and axion-like scalar fields are potential candidates for dark energy and/or dark matter, it is natural to consider cosmological black holes endowed with axion hair. We investigate the photon quasinormal modes of a Schwarzschild black hole with axion hair where the electromagnetic field is coupled to the axion field via a Chern-Simons interaction. We derive the master equations for the electromagnetic field as a set of coupled equations for …

The Galactic Pizza: Flat Rotation Curves in the Context of Cosmological Time-Energy Coupling
Artur Novais, Andr\'e L. B. Ribeiro
https://arxiv.org/abs/2506.02045

The Galactic Pizza: Flat Rotation Curves in the Context of Cosmological Time-Energy Coupling
The phenomenon of augmented gravity on the scale of galaxies, conventionally attributed to dark matter halos, is shown to possibly result from the incremental growth of galactic masses and radii over time. This approach elucidates the cosmological origins of the acceleration scale $a_0\approx cH_0/2π\approx10^{-10}$ms$^{-2}$ at which galaxy rotation curves deviate from Keplerian behavior, with no need for new particles or modifications to the laws of gravity, i.e., it constitutes a new explana…

This https://arxiv.org/abs/2503.09714 has been replaced.
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Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples
We present the first joint analysis of the power spectrum and bispectrum using the Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI), focusing on Luminous Red Galaxies (LRGs) and quasars (QSOs) across a redshift range of $0.4\leq z\leq2.1$. By combining the two- and three-point statistics, we are able to partially break the degeneracy between the logarithmic growth rate, $f(z)$, and the amplitude of dark matter fluctuations, $σ_\textrm{s8}(z)$, which cannot be measured se…

Search for a dark baryon in the $\Xi^-\rightarrow\pi^- {\rm invisible}$ decay
BESIII Collaboration, et al.
https://arxiv.org/abs/2505.22140 https://…

Search for a dark baryon in the $Ξ^-\rightarrowπ^-+{\rm invisible}$ decay
A search for a dark baryon is performed for the first time in the two-body decay $Ξ^-\rightarrowπ^-+{\rm invisible}$ using $(10.087\pm0.044)\times10^{9}$ $J/ψ$ events collected at a center-of-mass energy of $\sqrt{s}=3.097\,\mbox{GeV}$ with the BESIII detector at the BEPCII collider. No significant signal is observed, and the 90% (95%) confidence level upper limits on the branching fraction $B(Ξ^-\rightarrowπ^-+{\rm invisible})$ are determined to be $4.2\times10^{-5}$ ($5.2\times10^{-5}$),…

This https://arxiv.org/abs/2411.13637 has been replaced.
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Do Observations Prefer Thawing Quintessence?
In light of recent observations by the Dark Energy Spectroscopic Instrument (DESI), we study evidence for thawing quintessence over a cosmological constant as dark energy, with emphasis on the effect of the choice of priors. Working with a parametrization for the equation of state parameter motivated by the theory, we analyse the DESI BAO data jointly with Planck 2018 and Pantheon+ or Dark Energy Survey supernovae data, and find a preference for thawing quintessence compared to a bare cosmologi…

This https://arxiv.org/abs/2505.21630 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Quasar absorption outflows on galactic scales: Insights from DESI
Absorption outflows in quasars play an important role in understanding active galactic nuclei (AGN) feedback and their influence on galaxy evolution. The unprecedented spectral data provided by the Dark Energy Spectroscopic Instrument (DESI) opens new avenues to explore these outflows. We analyze five low-ionization absorption outflow systems in four intermediate-redshift quasars (2 < z < 3) using the data obtained by DESI in order to characterize their physical properties and energetics, and a…

This https://arxiv.org/abs/2505.01312 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Dynamical dark energy and gravitational coupling from moving geometries
We introduce the notion of moving Cartan geometries described by quotients of Lie groups and Lie algebras with spacetime dependant structure constants and construct associated deformed topological gauge action functionals for Lorentzian (including dS and AdS) and Lorentz$\times$Weyl moving geometries. The actions feature a generalization of the Nieh-Yan topological term for a varying coupling constant. We compute the equations of motion of the gauge $+$ matter actions and show that they dictate…

This https://arxiv.org/abs/2504.07679 has been replaced.
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Assessing cosmological evidence for non-minimal coupling
The recent observational evidence of deviations from the $Λ$-Cold Dark Matter ($Λ$CDM) model points towards the presence of evolving dark energy. The simplest possibility consists of a cosmological scalar field $φ$, dubbed quintessence, driving the accelerated expansion. We assess the evidence for the existence of such a scalar field. We find that, if the accelerated expansion is driven by quintessence, the data favour a potential energy $V(φ)$ that is concave, i.e., $m^2=d^2V/dφ^2<0$. Fur…

Is GGAG:Ce@SiO$_2$-RB composite a prospective material for X-ray induced photodynamic therapy?
Iveta Terezie Ho\v{s}nov\'a, Krist\'yna Havlinov\'a, Jan B\'arta, Karol\'ina Mocov\'a, Xenie Lytvynenko, Lenka Prouzov\'a Proch\'azkov\'a, Vojt\v{e}ch Kazda, Franti\v{s}ek H\'ajek, Viliam M\'u\v{c}ka, V\'aclav \v{C}uba

Is GGAG:Ce@SiO$_2$-RB composite a prospective material for X-ray induced photodynamic therapy?
Nanocomposite material ($\mathrm{GGAG:Ce^{3+}@SiO_2-RB}$) for potential use in X-ray induced photodynamic therapy (X-PDT) was developed, thoroughly characterized, and evaluated. It consists of a scintillating $\mathrm{Gd_3(Ga_{1-x}Al_x)_5O_{12}:Ce^{3+}}$ core encapsulated in silica layer and functionalized with the photosensitizer Rose Bengal (RB). Radioluminescence measurements confirmed the energy transfer from the scintillating core to Rose Bengal. Dark toxicity and radiosensitisation effect…

Splashback radius and the mass accretion rate of RASS MCMF galaxy clusters
Jitendra Joshi, Divya Rana, Surhud More, Matthias Klein
https://arxiv.org/abs/2506.08925

Splashback radius and the mass accretion rate of RASS MCMF galaxy clusters
We present measurements of the radial profile of mass and galaxy number density around X-ray selected ROSAT All Sky Survey-Multi-Component Matched Filter galaxy clusters using Year 3 data from the Dark Energy Survey. We measure the projected cross-correlation signal of the RedMaGiC "high density" galaxies around an approximately volume-limited sample of 255 galaxy clusters at a median redshift of $z=0.4$ and an X-ray luminosity $L_X > 10^{44} \,\text{ergs} \, \text{s}^{-1} \, \text{h}^{-2}$. Th…

This https://arxiv.org/abs/2503.03076 has been replaced.
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Non-Affine Extensions of the Raychaudhuri Equation in the K-essence Framework
We present a new avenue of the Raychaudhuri Equation (RE) by introducing a non-affine parametrization within the k-essence framework. This modification accounts for non-geodesic flow curves, leading to emergent repulsive effects in cosmic evolution. Using a DBI-type k-essence Lagrangian, we derive a modified RE and demonstrate its ability to address the Hubble tension while predicting a natural emergence of a dynamical dark energy equation of state. Our Bayesian analysis, constrained by cosmolo…

This https://arxiv.org/abs/2505.19052 has been replaced.
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Probing Time-Varying Dark Energy with DESI: The Crucial Role of Precision Matter Density ($Ω_{m0}$) Measurements
Accurate measurements of fundamental cosmological parameters, especially the Hubble constant ($H_0$) and present-day matter density ($Ω_{m0}$), are crucial for constraining dark energy (DE) evolution. We analyze the sensitivities of cosmological observables ($H(z)$, $D_L(z)$, $\EG$) to $Ω_{m0}$, $ω_0$, and $ω_a$ under different parametrizations. Our results show observables are far more sensitive to $Ω_{m0}$ than to DE equation of state parameters (e.g., at $z \sim 0.5$, $H(z)$'s $Ω_{m0}$…

Cosmology Constraints from Type Ia Supernova Simulations of the Nancy Grace Roman Space Telescope Strategy Recommended by the High Latitude Time Domain Survey Definition Committee
Richard Kessler, Rebekah Hounsell, Bhavin Joshi, David Rubin, Masao Sako, Rebecca Chen, Vivian Miranda, Benjamin. M. Rose
https://arxiv.org/abs/2506.0…

Cosmology Constraints from Type Ia Supernova Simulations of the Nancy Grace Roman Space Telescope Strategy Recommended by the High Latitude Time Domain Survey Definition Committee
Within the next few years, the upcoming Nancy Grace Roman Space Telescope will be gathering data for the High Latitude Time Domain Survey (HLTDS) that will be used to significantly improve the Type Ia supernova measurement of the dark energy equation of state parameters w0 and wa. Here we generate a catalog-level simulation of the in-guide strategy recommended by the HLTDS definition committee, and determine dark energy parameter constraints using a detailed analysis that includes light curve f…

This https://arxiv.org/abs/2505.20430 has been replaced.
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DESI Emission Line Galaxies: Clustering Dependence one Stellar Mass and [OII] Luminosity
We measure the projected two-point correlation functions of emission line galaxies (ELGs) from the Dark Energy Spectroscopic Instrument (DESI) One-Percent Survey and model their dependence on stellar mass and [OII] luminosity. We select $\sim$180,000 ELGs with redshifts of $0.8 < z < 1.6$ and define 27 samples according to cuts in redshift and both galaxy properties. Following a framework that describes the conditional [OII] luminosity-stellar mass distribution as a function of halo mass, we si…

This https://arxiv.org/abs/2505.09879 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

New cosmological constraints on the evolution of dark matter energy density
We constrain the evolution of dark matter energy density over time, specifically focusing on deviation from the standard model represented by the equation $ρ_{m}\propto(1+z)^{3-\varepsilon}$, where $\varepsilon$ is a constant parameter. Utilizing a diverse array of observational datasets, including baryon acoustic oscillations (BAO) data from the first release of the Dark Energy Spectroscopic Instrument (DESI), distance priors derived from cosmic microwave background (CMB) observations by the …

This https://arxiv.org/abs/2501.08161 has been replaced.
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Cosmological model with Gong-Zong Parametrization in $f(R,L_m)$ gravity
We present the cosmic expansion scenarios in the $f(R, L_m)$ gravity studied by using the dark energy equation of state (EoS) parameters. We proceed with the specific form of $f(R, L_m)$ gravity termed as $f(R, L_m)=\frac{R}{2}+L_{m}^α$. We derive the expansion rate in terms of the red-shift for two different forms of EoS parameter. In first model, EoS parameter varies inversely with the redshift and in second model, it involves the exponential form with the redshift. By using the Bayesian met…

This https://arxiv.org/abs/2502.07185 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Expansion-history preferences of DESI DR2 and external data
We explore the origin of the preference of DESI DR2 baryon acoustic oscillation (BAO) measurements and external data from cosmic microwave background (CMB) and type Ia supernovae (SNIa) that dark energy behavior departs from that expected in the standard cosmological model with vacuum energy ($Λ$CDM). In our analysis, we allow a flexible scaling of the expansion rate with redshift that nevertheless allows reasonably tight constraints on the quantities of interest, and adopt and validate a simp…

This https://arxiv.org/abs/2501.05683 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Dark Energy Survey Year 6 Results: Synthetic-source Injection Across the Full Survey Using Balrog
Synthetic source injection (SSI), the insertion of sources into pixel-level on-sky images, is a powerful method for characterizing object detection and measurement in wide-field, astronomical imaging surveys. Within the Dark Energy Survey (DES), SSI plays a critical role in characterizing all necessary algorithms used in converting images to catalogs, and in deriving quantities needed for the cosmology analysis, such as object detection rates, galaxy redshift estimation, galaxy magnification, s…

This https://arxiv.org/abs/2505.08467 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The matter with(in) CPL
We introduce a two-parameter phenomenological extension of the $Λ$CDM model in which the equation of state parameter of the ``dust'' fluid becomes different from zero for redshifts below a transition value $z_t$. Using data from DESI DR2 BAO, DESY5 Sn~Ia and CMB distance priors ($R,l_A,ω_b$) data, we compare our model with the standard CPL parameterization $w_0-w_a$ for dynamical dark energy. Using the Deviance Information Criteria (DIC), we find that the two models are essentially indistingu…

Analyzing Line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear
Xianzhe TZ Tang, Simon Birrer, Anowar J. Shajib, Narayan Khadka, the LSST Strong Gravitational Lensing Science Collaboration, the LSST Dark Energy Science Collaboration
https://arxiv.org/abs/2506.04201

Analyzing Line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear
The upcoming Vera Rubin Observatory Legacy Survey of Space and Time (LSST) will dramatically increase the number of strong gravitational lensing systems, requiring precise modeling of line-of-sight (LOS) effects to mitigate biases in lensing observations and cosmological inferences. We develop a method to construct joint distributions of external convergence ($κ_{\mathrm{ext}}$) and shear ($γ_{\mathrm{ext}}$) for strong lensing LOS by aggregating large-scale structure simulations with high-re…

This https://arxiv.org/abs/2501.11772 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A New Master Supernovae Ia sample and the investigation of the $H_0$ tension
Modern cosmological research still thoroughly debates the discrepancy between local probes and the Cosmic Microwave Background observations in the Hubble constant (\texorpdfstring{$H_0$}{H0}) measurements, ranging from 4 to 6$σ$. In the current study, we examine this tension using the Supernovae Ia (SNe Ia) data from the Pantheon, Pantheon+ (P+), Joint Lightcurve Analysis (JLA), and Dark Energy Survey, (DES) catalogs combined together into the so-called Master Sample. The sample contains 3714 …