Tootfinder

The ALMA-CRISTAL survey - gas, dust, and stars in star-forming galaxies when the Universe was ~1 Gyr old -> Survey overview and case studies: #ALMA Reveals Stunning Details of Infant #Galaxies in the Early Universe: #Universe was just a toddler.

marvel_universe: Marvel Universe social network
The Marvel Universe collaboration network, where two Marvel characters are considered linked if they jointly appear in the same Marvel comic book.
This network has 19428 nodes and 95497 edges.
Tags: Social, Fictional, Unweighted
https://networks.skewed.de/ne…

Cascade Relaxation of the Gravitating Vacuum as a Generator of the Evolving Universe
V. N. Lukash (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences, Russia), E. V. Mikheeva (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences)
https://arxiv.org/abs/2506.03226

Cascade Relaxation of the Gravitating Vacuum as a Generator of the Evolving Universe
The cascade relaxation of a polarized vacuum in the expanding Universe is a chain of evolutionary epochs of decreasing its density with the exit of dominant fields (each in its own time) from the initial zero states to nonzero values, from the dominant scalar field in the early Universe to subsequent ones, including the $Λ$-term in the modern Universe. The cascade vacuum relaxation creates the entire observable cosmology from the Friedmann model with small perturbations of the metric with non-…

Scientists look to black holes to know exactly where we are in the Universe. But phones and wifi are blocking the view
In other news, the ancient Romans built their aquaducts out of lead.
https://theconversation.com/scientists-look-to-black-holes-to-know-exactly-where-we-are-in-the-universe-but-phones-and-wifi-are-blocking-the-view-259977

Siguiendo el especial de Pulp, presentamos «Master of the Universe», canción del 2do disco de la banda, Freaks, de 1987. Un šlbum notablemente mšs denso y oscuro que el debut y que no tuvo mucho éxito por esa época.
https://open.spotify.com/track/0GoYxBhAAApHrfGERig7Y9

TIPS FOR PERFORMERS:
Playing cards have the top half upside-down to help cheaters.
There are a finite number of jokes in the universe.
Singing is a trick to get people to listen to music longer than
they would ordinarily.
There is no music in space.
People will pay to watch people make sounds.
Everything on stage should be larger than in real life.

from my link log —
Dissolving the Fermi paradox.
https://arxiv.org/abs/1806.02404
saved 2025-04-18 https://dotat.at/:/U1H2Q.html

Dissolving the Fermi Paradox
The Fermi paradox is the conflict between an expectation of a high {\em ex ante} probability of intelligent life elsewhere in the universe and the apparently lifeless universe we in fact observe. The expectation that the universe should be teeming with intelligent life is linked to models like the Drake equation, which suggest that even if the probability of intelligent life developing at a given site is small, the sheer multitude of possible sites should nonetheless yield a large number of pot…

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/2501.01860 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Constraining eV-scale axion-like particle dark matter: insights from the M87 Galaxy
Axion-like particles (ALPs) can account for the observed dark matter (DM) of the Universe and if their masses are at the eV scale, they can decay into infrared, optical and ultraviolet photons with a decay lifetime larger than the age of the Universe.We analyze multi-wavelength data obtained from the central region of Messier 87 (M87) galaxy by several telescopes, such as, Swift, Astrosat, Kanata, Spitzer and International Ultraviolet Explorer in the infrared to ultraviolet frequencies ($\sim 2…

All the different species in the #StarTrek universe have different requirements for (bodily) comfort. An aspect only sometimes mentioned in the different series and movies. But we will look at this aspect for today's #TrekTriviaTuesday question.
As always no googling and no spoiling t…

This https://arxiv.org/abs/2505.24586 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

All-sky search for individual Primordial Black Hole bursts with LHAASO
Primordial Black Holes~(PBHs) are hypothetical black holes with a wide range of masses that formed in the early universe. As a result, they may play an important cosmological role and provide a unique probe of the early universe. A PBH with an initial mass of approximately $10^{15}$~g is expected to explode today in a final burst of Hawking radiation. In this work, we conduct an all-sky search for individual PBH burst events using the data collected from March 2021 to July 2024 by the Water Che…

Nearby dwarf galaxies with extreme star formation rates: a window into dwarf-galaxy evolution in the early Universe
S. Kaviraj, B. Bichang'a, I. Lazar, A. E. Watkins, G. Martin, R. A. Jackson
https://arxiv.org/abs/2506.03265

Nearby dwarf galaxies with extreme star formation rates: a window into dwarf-galaxy evolution in the early Universe
We study a sample of nearby (z~0.2) low-luminosity dwarf (10^7 MSun < M* < 10^8 MSun) galaxies which have extreme (0.1 - 3 MSun/yr) star formation rates (SFRs) for this mass regime, making them plausible analogues of dwarfs at z~5.5. We compare the properties of these analogues to control samples of 'normal' dwarfs, which reside on the star formation main sequence (SFMS) at z~0.2 and are matched in their stellar mass and redshift distributions to the analogue population. The analogue and normal…

Now settled into low-Earth orbit, #SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) has begun delivering its sky survey data to a public archive on a weekly basis, allowing anyone to use the data to probe the secrets of the cosmos: https://science.nasa.gov/open-science/spherex-universe-map/

🇺🇦 #NowPlaying on KEXP's #AfternoonShow
Khruangbin:
🎵 Time (You and I)
#Khruangbin
https://khruangbin.bandcamp.com/album/the-universe-smiles-upon-you
https://open.spotify.com/track/0S3BtG3i5tkQmehJhIhHF3

Reconstruction of the observable universe from the integrated Sachs-Wolfe effect
Julianne Chung, Yiran Wang
https://arxiv.org/abs/2507.01399 https://

Reconstruction of the observable universe from the integrated Sachs-Wolfe effect
The integrated Sachs-Wolfe (ISW) effect is a property of the Cosmic Microwave Background (CMB), in which photons from the CMB are gravitationally redshifted, causing the anisotropies in the CMB. An intriguing question is whether one can infer the gravitational perturbations from the ISW effect observed near the Earth. In this work, we address the question using a tomographic reconstruction approach, similar to X-ray CT reconstruction in medical imaging. We develop the mathematical analysis for …

VLTI observations of the Orion Belt stars: I. eps Orionis
Al\v{z}b\v{e}ta Opli\v{s}tilov\'a, Miroslav Bro\v{z}, Christian A. Hummel, Petr Harmanec, Brad Barlow
https://arxiv.org/abs/2507.02276

VLTI observations of the Orion Belt stars: I. eps Orionis
Massive stars play a decisive role in the evolution of the Universe. In order to constrain their current state and structure, we need sufficiently complex models, constrained by astrometric, interferometric, and spectroscopic observations. However, they are not available for distant stars. Instead, we focused on the nearest massive stars in the Orion Belt. We obtained VLTI interferometric observations of Orion Belt stars and calibrated visibility data from the GRAVITY and PIONIER instruments. A…

This https://arxiv.org/abs/1910.10819 has been replaced.
link: https://scholar.google.com/scholar?q=a

Universe in a rotating black hole and preferred axis
If our universe was born as a baby universe on the other side of the event horizon of a black hole existing in a parent universe, then the corresponding white hole at rest provides the absolute frame of reference in the universe. In this frame, the cosmic microwave background radiation is isotropic on large scales. If the parent black hole is rotating, then its axis of rotation becomes a preferred axis in the universe. Accordingly, the absolute frame is non-inertial, although the non-inertial f…

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Nicolas Grimbaum Yamamoto, Thomas Hambye
https://arxiv.org/abs/2507.02063

Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
Among the few ways that allow or could allow us to probe the early Universe from the observation of a flux of primordial particles, there is one possibility which has been little studied: the observation today of high energy neutrinos which could have been emitted shortly after the Big Bang, from the decay or annihilation of early universe relics. We perform a general study of such a possibility. To this end we first emphasise that these neutrinos could display various kinds of sharp spectral f…

Fluid dynamics of a liquid mirror space telescope
Israel Gabay, Omer Luria, Edward Balaban, Amir D. Gat, Moran Bercovici
https://arxiv.org/abs/2507.02812 h…

Fluid dynamics of a liquid mirror space telescope
Large aperture telescopes are pivotal for exploring the universe, yet even with state-of-the-art manufacturing and launch technology, their size is limited to several meters. As we aim to build larger telescopes - extending tens of meters - designs in which the main mirror is based on liquid deployment in space are emerging as promising candidates. However, alongside their enormous potential advantages, liquid-based surfaces present new challenges in material science, mechanics, and fluid dynam…

#TerryPratchett

A Universe with a $\Delta^1_n$-definable well-order of the reals, $\mathsf{CH}$ and $\Pi^1_n$-Uniformization
Stefan Hoffelner
https://arxiv.org/abs/2506.21778

A Universe with a $Δ^1_n$-definable well-order of the reals, $\mathsf{CH}$ and $Π^1_n$-Uniformization
This paper details the construction of a universe where $Π^1_3$-uniformization is true, the Continuum Hypothesis holds yet it possesses a $Δ^1_3$-definable well-order of its reals. The method can be lifted to canonical inner models with finitely many Woodin cardinals to produce universes of $\mathsf{CH}$, $Π^1_n$-uniformization and where additionally a $Δ^1_n$-definable well-order of the reals exist.

Is $\omega_0 \omega_a$CDM a good model for the clumpy Universe?
Fernanda Oliveira, Felipe Avila, Camila Franco, Armando Bernui
https://arxiv.org/abs/2507.00779

Is $ω_0 ω_a$CDM a good model for the clumpy Universe?
The DESI collaboration just obtained a set of precise BAO measurements, that combined with CMB and SNIa datasets show that the $ω_0 ω_a$CDM model is preferred over $Λ$CDM, at more than $4\,σ$, to describe the dynamics of the expanding Universe. This raises the question whether this model also suitably describes the clumpy Universe. Also lately, detailed analyses of diverse cosmic tracers resulted in a new dataset of measurements of an observable from the clumpy Universe: $σ_8(z)$, spanning…

Development of new ultra-low-background particle detectors based on Micromegas technology for the search of Dark Matter at the low-mass frontier
Oscar Perez
https://arxiv.org/abs/2507.02172

Development of new ultra-low-background particle detectors based on Micromegas technology for the search of Dark Matter at the low-mass frontier
Weakly Interacting Massive Particles (WIMPs) are one of the best motivated candidates to compose the Dark Matter of the Universe. The lack of experimental confirmation by direct detection experiments or collider searches has ruled out canonical WIMP scenarios (masses $\sim$ GeV-TeV), making a case for the largely unexplored sub-GeV frontier. This PhD thesis is focused on the evolution and latest developments of TREX-DM, a gaseous Time Projection Chamber (TPC) designed to detect low-mass WIMPs t…

The most energetic transients - tidal disruptions of high-mass stars: #ExtremeNuclearTransients (ENTs) are the most energetic transients yet observed.

Kinematic Distortions of the High-Redshift Universe as Seen from Quasar Proper Motions
Valeri V. Makarov
https://arxiv.org/abs/2507.01798 https://

Kinematic Distortions of the High-Redshift Universe as Seen from Quasar Proper Motions
Advances in optical astrometry allow us to infer the non-radial kinematic structure of the Universe directly from observations. Here I use a supervised machine learning neural network method to predict 1.57 million redshifts based on several photometric and metadata classifier parameters from the unWISE mid-infrared database and from Gaia. These estimates are used to divide the sample into three redshift bins: 1-2, 2-3, and $>3$. For each subset, all available Gaia proper motions are used in a …

this was a plot point in vernor vinge's "rainbow's end" (2006), retroactively part of the expanded "torment nexus" universe apparently. https://code4lib.social/@dltj/114774949197817082

Entanglement on a Sphere
Konstantinos Boutivas, Dimitrios Katsinis, Georgios Pastras, Nikolaos Prountzos, Nikolaos Tetradis
https://arxiv.org/abs/2507.01174

Entanglement on a Sphere
We study the entanglement entropy of a massive scalar field in the background of the Einstein universe. We determine numerically the structure of the UV-divergent terms. We study analytically the IR term that originates in the long-range correlations arising from the field zero mode on the sphere. We compare with previous results for a scalar field in a dS or AdS background.

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 …

This https://arxiv.org/abs/2503.07718 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Deciphering the Sources of Cosmic Neutrinos
More than a decade ago, the IceCube Neutrino Observatory discovered a diffuse flux of 10 TeV-10 PeV neutrinos from our Universe. This flux of unknown origin most likely emanates from an extragalactic population of neutrino sources, which are individually too faint to appear as bright emitters. We review constraints on extragalactic neutrino source populations based on the non-detection of the brightest neutrino source. Extending previous work, we discuss limitations of source populations based …

The universe is like a bagel.
A donut is like a bagel.
Everything is like a bagel.
- the wisdom of the gummy

marvel_universe: Marvel Universe social network
The Marvel Universe collaboration network, where two Marvel characters are considered linked if they jointly appear in the same Marvel comic book.
This network has 19428 nodes and 95497 edges.
Tags: Social, Fictional, Unweighted
https://networks.skewed.de/ne…

Existence Theorem for Cumulative Universe Towers and Its Applications
Higuchi Joaquim Reizi
https://arxiv.org/abs/2506.21653 https://…

Existence Theorem for Cumulative Universe Towers and Its Applications
This paper builds a cumulative tower of Grothendieck universes that provides a precise size discipline for higher type theory. Starting from an increasing sequence of inaccessible cardinals, we give an inductive-recursive definition of universe codes, their decoding functor, and a rank that controls the growth of each code. For every level of the tower we prove closure under dependent products, dependent sums, identity types, and all finite limits and colimits; the colimit part is obtained with…

@… Not directly a Nestflix, but not a million km away either... https://mastodon.oysta.au/@oysta/114588644020339419

The Lifespan of our Universe
Hoang Nhan Luu, Yu-Cheng Qiu, S. -H. Henry Tye
https://arxiv.org/abs/2506.24011 https://arxiv.org/pdf/25…

The Lifespan of our Universe
The Dark Energy Survey (DES) and the Dark Energy Spectroscopic Instrument (DESI) measurements claim that the dark energy equation of state $w \ne -1$. This observation can be explained by the axion Dark Energy (aDE) model of an ultralight axion plus a cosmological constant $Λ$. Despite a relatively large degeneracy, there is a high probability that $Λ<0$. This negative $Λ$ leads the universe to end in a big crunch. Using the best-fit values of the model as a benchmark, we find the lifespan o…

Testing Realism in Quantum Mechanics Through Charge Conservation
Victor Atanasov
https://arxiv.org/abs/2507.01965 https://arxiv.org/p…

Testing Realism in Quantum Mechanics Through Charge Conservation
The universe is not locally realistic. Abandoning causality often appears more palatable than giving up on realism. This paper proposes two novel experimental setups to test realism's failure using the conservation of electric charge. The first employs weak measurements of charge density in a double-slit interference setup. The second uses entangled charged particles in a Bell-type experiment, measuring electric field correlations to detect non-local charge distribution. Both leverage charge co…

This https://arxiv.org/abs/2310.07661 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Constraints on Bianchi-I type universe with SH0ES anchored Pantheon+ SNIa data
We study the Bianchi-I cosmological model motivated by signals of statistical isotropy violation seen in cosmic microwave background (CMB) observations and others. To that end, we consider various kinds of anisotropic matter that source anisotropy in our model, specifically Cosmic strings, Magnetic fields, Domain walls and Lorentz violation generated magnetic fields. These anisotropic matter sources, taking one at a time, are studied for their co-evolution with standard model (isotropic) source…

🔊 #NowPlaying on #BBCRadio3:
#MusicMap
- A journey to Beethoven's Moonlight Sonata
Sara Mohr-Pietsch maps a musical universe around Beethoven’s Moonlight Sonata, exploring the sound worlds of Mozart, Holst and Saint-Saëns along the way.
Relisten now 👇
https://www.bbc.co.uk/programmes/m002754l

Primordial black hole formation in k-inflation models
Neven Bili\'c, Dragoljub D. Dimitrijevi\'c, Goran S. Djordjevi\'c, Milan Milo\v{s}evi\'c, Marko Stojanovi\'c
https://arxiv.org/abs/2507.02490

Primordial black hole formation in k-inflation models
The local primordial density fluctuations caused by quantum vacuum fluctuations during inflation grow into stars and galaxies in the late universe and, if they are large enough, also produce primordial black holes. We study the formation of the primordial black holes in $k$-essence inflation models with a potential characterized by an inflection point. The background and perturbation equations are integrated numerically for two specific models. Using the critical collapse and peaks formalism, w…

This could be great!
Cartoon Network Studios is expanding the beloved “Steven Universe” franchise with a brand-new series, “Steven Universe: Lars of the Stars,” now in development for Prime Video.
https://variety.com/2025/tv/global/ste

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…

A look at YouTube's changes to become viewers' preferred TV service and to appeal more to advertisers, and at creators' push into sitcoms, like Alan's Universe (Lucas Shaw/Bloomberg)
https://www.bloomberg.com/news/features/20

Hot take about #StarWars #Andor:
1️⃣ It requires the viewer to pay attn to, remember & think about the story's subplots & not be an ADHD idiot
2️⃣ It makes the narrative familiar but also takes it very seriously
3️⃣ It uses the SW universe exclusively to tell a story, not t…

Evolutionary Map of the Universe: Detection and Analysis of the Shell Surrounding the Runaway Wolf-Rayet Star WR16
A. C. Bradley, M. D. Filipovi\'c, Z. J. Smeaton, H. Sano, Y. Fukui, C. Bordiu, S. Cichowolski, N. F. H. Tothill, R. Z. E. Alsaberi, F. Bufano, S. Dai, Y. A. Gordon, A. M. Hopkins, T. H. Jarrett, B. S. Koribalski, S. Lazarevi\'c, C. J. Riseley, G. Rowell, M. Sasaki, D. Uro\v{s}evi\'c, T. Vernstrom

Evolutionary Map of the Universe: Detection and Analysis of the Shell Surrounding the Runaway Wolf-Rayet Star WR16
We present the first radio--continuum detection of the circumstellar shell around the well-known WN8 type Wolf-Rayet star WR16 at 943.5\,MHz using the \ac{ASKAP} \ac{EMU} survey. At this frequency, the shell has a measured flux density of 72.2$\pm$7.2\,mJy. Using previous \ac{ATCA} measurements at 2.4, 4.8, and 8.64~GHz, as well as the \ac{EMU} observations of the star itself, we determine a spectral index of $α\,=\,+0.74\pm0.02$, indicating thermal emission. We propose that the shell and star…

This https://arxiv.org/abs/2503.14460 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Low-Metallicity Star Formation Survey in Sh2-284 (LZ-STAR). I. Ordered massive star formation in the outer Galaxy
Star formation is a fundamental, yet poorly understood, process of the Universe. It is important to study how star formation occurs in different galactic environments. Thus, here, in the first of a series of papers, we introduce the Low-Metallicity Star Formation (LZ-STAR) survey of the Sh2-284 (hereafter S284) region, which, at $Z\sim 0.3-0.5Z_\odot$, is one of the lowest-metallicity star-forming regions of our Galaxy. LZ-STAR is a multi-facility survey, including observations with {\it JWST},…

The Exact and Approximate Tales of Boost-Breaking Cosmological Correlators
Zhehan Qin, S\'ebastien Renaux-Petel, Xi Tong, Denis Werth, Yuhang Zhu
https://arxiv.org/abs/2506.01555

The Exact and Approximate Tales of Boost-Breaking Cosmological Correlators
Cosmological correlators offer a remarkable window into the high-energy physics governing Universe's earliest moments, with the tantalising prospect of discovering new particles. However, extracting new physics from these observables requires both precise theoretical predictions of inflationary theories and accurate, analytical templates suitable for data analysis throughout parameter and kinematic spaces. In this paper, we extend the current analytical results by computing the most general boo…

Dark photon dark matter constraints and a tentative signal at the TASEH experiment
Yuan-Hann Chang, Cheng-Wei Chiang, Hien Thi Doan, Nick Houston, Jinmian Li, Tianjun Li, Lina Wu, Xin Zhang
https://arxiv.org/abs/2507.00784

Dark photon dark matter constraints and a tentative signal at the TASEH experiment
The dark photon is a well motivated candidate for the dark matter which comprises most of the mass of our visible Universe, leading to worldwide experimental and observational efforts towards its discovery. A primary tool in this search is the cavity haloscope, which facilitates resonantly enhanced conversion to photons from both dark photons and axions. In this context, limits from axion search experiments are often directly converted into dark photon constraints, without re-analyzing the orig…

@… @… I’m still hoping that the Questionable Content universe is our future, so I wouldn’t want to introduce terminology that will become outdated once I’m hanging out with robots in the coffee shop.

Revisiting Isocurvature Bounds on the Minimal QCD Axion
Peter W. Graham, Davide Racco
https://arxiv.org/abs/2506.03348 https://arxiv.…

Revisiting Isocurvature Bounds on the Minimal QCD Axion
The QCD axion has important connections to early universe cosmology. For example, it is often said that isocurvature limits rule out a combination of high axion decay constant, $f_a$, and high inflationary Hubble scale, $H_I$. High scales are theoretically motivated, so it is important to ask how robust this constraint is. We demonstrate that this constraint is naturally evaded when the quartic coupling of the complex $U(1)_\mathrm{PQ}$-breaking field is small. In this case, $f_a$ changes from …

This https://arxiv.org/abs/2408.09964 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Extended $δN$ formalism: Nonspatially Flat Separate Universe Approach
The $δN$ formalism is a powerful approach to compute non-linearly the large-scale evolution of the comoving curvature perturbation $ζ$. It assumes a set of FLRW patches that evolve independently, but in doing so, all the gradient terms are discarded, which are not negligibly small in models beyond slow-roll. In this Letter, we extend the formalism to capture these gradient corrections by encoding them in a homogeneous-spatial-curvature contribution assigned to each FLRW patch. For a concrete …

Cosmological Dynamics of Accelerating Model in $f(T)$ Gravity with Special Form of Deceleration Parameter
Shivank Pal, Romanshu Garg, Gyan Prakash Singh, Gauree Shanker
https://arxiv.org/abs/2506.03756

Cosmological Dynamics of Accelerating Model in $f(T)$ Gravity with Special Form of Deceleration Parameter
In this paper, the dynamical behavior of the accelerated expansion of the universe is discussed within the framework of $f(T)$ gravity for a particular form of $ f(T)=α(-T)^{n}$. Considering a redshift-dependent parameterization of the deceleration parameter as $q(z)=q_{0}+ q_{1}\left(\frac{ \ln(N+z)}{z+1}-\ln N \right)$. We have derived the Hubble parameter in terms of redshift and discussed its effect on other cosmological parameters. Using Bayesian statistical analysis and $χ^2$-minimizati…

This https://arxiv.org/abs/2412.09699 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Neutrinos from explosive transients at the dawn of multi-messenger astronomy
With the advent of time-domain astronomy and the game-changing next generation of telescopes, we have unprecedented opportunities to explore the most energetic events in our Universe through electromagnetic radiation, gravitational waves, and neutrinos. These are elementary particles, which exist in three different flavors and change the latter as they propagate in the dense core of astrophysical sources as well as en route to Earth. To capitalize on existing and upcoming multi-messenger opport…

marvel_universe: Marvel Universe social network
The Marvel Universe collaboration network, where two Marvel characters are considered linked if they jointly appear in the same Marvel comic book.
This network has 19428 nodes and 95497 edges.
Tags: Social, Fictional, Unweighted
https://networks.skewed.de/ne…

The galaxy-AGN scaling relations over 13 billion years in SHARK v2.0 (I): SMBH masses
Mat\'ias Bravo, Claudia del P. Lagos, Katy L. Proctor, \'Angel Chandro-G\'omez, Chris Power
https://arxiv.org/abs/2506.03354

The galaxy-AGN scaling relations over 13 billion years in SHARK v2.0 (I): SMBH masses
The presence of strong correlations between super-massive black hole (SMBH) masses and galaxy properties like stellar mass have been well-established in the local Universe, but how these scaling relations evolve with cosmic time is yet to be settled in both observations and theoretical models. Recent works have also highlighted the role of galaxy morphology on the scatter of the SMBH-galaxy mass scaling relations, while the impact of other galaxy properties remains poorly studied, like the role…

Ground calibration plan for the Athena/X-IFU microcalorimeter spectrometer
Alexe\"i Molin, Fran\c{c}ois Pajot, Marc Audard, Marco Barbera, Sophie Beaumont, Edoardo Cucchetti, Matteo D'Andrea, Christophe Daniel, Roland den Hartog, Megan E. Eckart, Philippe Ferrando, Luciano Gottardi, Maurice Leutenegger, Simone Lotti, Lorenzo Natalucci, Philippe Peille, Jelle de Plaa, Etienne Pointecouteau, Scott Porter, Kosuke Sato, Joern Wilms, Vincent Albouys, Didier Barret, Massimo Cappi, J…

Ground calibration plan for the Athena/X-IFU microcalorimeter spectrometer
The X-ray Integral Field Unit is the X-ray imaging spectrometer on-board one of ESA's next large missions, Athena. Athena is set to investigate the theme of the Hot and Energetic Universe, with a launch planned in the late-2030s. Based on a high sensitivity Transition Edge Sensor (TES) detector array operated at very low temperature (50 mK), X-IFU will provide spatially resolved high resolution spectroscopy of the X-ray sky in the 0.2-12 keV energy band, with an energy resolution goal of 4 eV u…

This https://arxiv.org/abs/2310.18397 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Detectable and defect-free dark photon dark matter
Ultralight dark photons are compelling dark matter candidates, but their allowed kinetic mixing with the Standard Model photon is severely constrained by requiring that the dark photons do not collapse into a cosmic string network in the early Universe. Direct detection in minimal production scenarios for dark photon dark matter is strongly limited, if not entirely excluded; discovery of sub-meV dark photon dark matter would therefore point to a nonminimal dark sector. We describe a model that …

A Correlation Between FRB Dispersion Measure and Foreground Large-Scale Structure
Maryam Hussaini, Liam Connor, Ralf M. Konietzka, Vikram Ravi, Jakob Faber, Kritti Sharma, Myles Sherman
https://arxiv.org/abs/2506.04186

A Correlation Between FRB Dispersion Measure and Foreground Large-Scale Structure
The distribution of baryons in the Universe remains a fundamental open question in astronomy, and the dispersion measure (DM) of Fast Radio Bursts (FRBs) serves as a valuable tool for probing this cosmic gas. We investigate the impact of the foreground cosmic web on FRB DMs using 61 localized FRBs and public galaxy catalogs. We test for the large-scale structure's impact on cosmological DM using two methods. First, we searched for a correlation between galaxy number density along the line of si…

Expansion-contraction duality breaking in a Planck-scale sensitive cosmological quantum simulator
S. Mahesh Chandran, Uwe R. Fischer
https://arxiv.org/abs/2506.02719

Expansion-contraction duality breaking in a Planck-scale sensitive cosmological quantum simulator
We propose the experimental simulation of cosmological perturbations governed by a Planck-scale induced Lorentz violating dispersion, aimed at distinguishing between early-universe models with similar power spectra. Employing a novel variant of the scaling approach for the evolution of a Bose-Einstein condensate with both contact and dipolar interactions, we show that scale invariance, and in turn, the duality of the power spectrum is broken at large momenta for an inflating gas, and at small m…

Global Kinetic Simulations of Monster Shocks and Their Emission
Dominic Bernardi, Yajie Yuan, Alexander Y. Chen
https://arxiv.org/abs/2506.04175 https://…

Global Kinetic Simulations of Monster Shocks and Their Emission
Fast magnetosonic waves are one of the two low-frequency plasma modes that can exist in a neutron star magnetosphere. It was recently realized that these waves may become nonlinear within the magnetosphere and steepen into some of the strongest shocks in the universe. These shocks, when in the appropriate parameter regime, may emit GHz radiation in the form of precursor waves. We present the first global Particle-in-Cell simulations of the nonlinear steepening of fast magnetosonic waves in a di…

CHemical Evolution in MassIve star-forming COres (CHEMICO). I. Evolution of the temperature structure
F. Fontani (INAF-Osservatorio Astrofisico di Arcetri, Florence, Laboratory for the study of the Universe and eXtreme phenomena, Max-Planck Institut for Extraterrestrial physics), V. M. Rivilla (Centro de Astrobiolog\'ia), E. Roueff (Laboratory for the study of the Universe and eXtreme phenomena), H. Mart\'in-Caballero (Centro de Astrobiolog\'ia), L. Bizzocchi (Dipartimento …

CHemical Evolution in MassIve star-forming COres (CHEMICO). I. Evolution of the temperature structure
Increasing evidence shows that most stars in the Milky Way, including the Sun, are born in star-forming regions containing also high-mass stars, but due to both observational and theoretical challenges, our comprehension of their chemical evolution is far less clear than that of their low-mass counterparts. We present the project "CHemical Evolution of MassIve star-froming COres" (CHEMICO). The project aims at investigating any aspect of the chemical evolution of high-mass star-forming cores by…

Revealing a transitional epoch of large-scale cosmic anisotropy in the quasar distribution
Amit Mondal, Biswajit Pandey, Krishna Ghosh
https://arxiv.org/abs/2507.02835

Revealing a transitional epoch of large-scale cosmic anisotropy in the quasar distribution
The Cosmological Principle posits that the Universe is isotropic on the largest scales. While widely supported, this foundational assumption remains testable. We analyse the angular distribution of over one million quasars from the Gaia-unWISE catalogue using Renyi entropy, a multiscale statistical measure sensitive to higher-order clustering. Dividing the sample into three redshift bins, we find that both the low- and high-redshift distributions are statistically consistent with isotropy. Howe…

Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
Panagiotis Dorlis, Nick E. Mavromatos, Sotirios-Neilos Vlachos, Makarios Vyros
https://arxiv.org/abs/2507.02746

Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
In this work, we study field theoretic systems of a single axion-like field with linear potentials modulated by cosine terms, allegedly induced by non-perturbative instanton configurations. These systems are considered in expanding-Universe spacetime backgrounds (of Friedman-Lema$\hat{\rm i}$tre-Robertson-Walker type). Using a dynamical-system approach, we classify the various de-Sitter like (inflationary) vacua from the point of view of their stability, which depend on the values of the model …

This https://arxiv.org/abs/2410.14774 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Experimental targets for dark photon dark matter
Ultralight dark photon dark matter features distinctive cosmological and astrophysical signatures and is also supported by a burgeoning direct-detection program searching for its kinetic mixing with the ordinary photon over a wide mass range. Dark photons, however, cannot necessarily constitute the dark matter in all of this parameter space. In minimal models where the dark photon mass arises from a dark Higgs mechanism, early-Universe dynamics can easily breach the regime of validity of the lo…

<JHM> AIX - the Unix from the universe where Spock has a beard.

This https://arxiv.org/abs/2404.07249 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

PolyBin3D: A Suite of Optimal and Efficient Power Spectrum and Bispectrum Estimators for Large-Scale Structure
By measuring, modeling and interpreting cosmological datasets, one can place strong constraints on models of the Universe. Central to this effort are summary statistics such as power spectra and bispectra, which condense the high-dimensional data into low-dimensional representations. In this work, we introduce a modern set of estimators for computing such statistics from three-dimensional clustering data, and provide a flexible Python/Cython implementation; PolyBin3D. Working in a maximum-likel…

Insights in $f(Q)$ cosmology: the relevance of the connection
Ismael Ayuso, Mariam Bouhmadi-L\'opez, Che-Yu Chen, Xiao Yan Chew, Konstantinos Dialektopoulos, Yen Chin Ong
https://arxiv.org/abs/2506.03506

Insights in $f(Q)$ cosmology: the relevance of the connection
We explore the role of the affine connection in $f(Q)$ gravity, a modified theory where gravity is governed by non-metricity within the symmetric teleparallel framework. Although the connection is constrained to be flat and torsionless, it is not uniquely determined by the metric, allowing for multiple physically distinct formulations. We analyze three such connections compatible with a homogeneous and isotropic universe to show that they yield markedly different cosmological dynamics, even und…

marvel_partnerships: Marvel character partnerships (2018)
A network of partnerships among characters in the Marvel comic book universe. Nodes are either heroes or villains, and edges represent partnerships between such characters. The partnership network was extracted from Wikipedia pages of these characters, which indicate partnership relations with other such pages.
This network has 350 nodes and 346 edges.
Tags: Social, Fictional, Unweighted

A theoretical prediction for the dipole in nearby distances using cosmography
Hayley J. Macpherson, Asta Heinesen
https://arxiv.org/abs/2507.01095 https://…

A theoretical prediction for the dipole in nearby distances using cosmography
Cosmography is a widely applied method to infer kinematics of the Universe at small cosmological scales while remaining agnostic about the theory of gravity at play. Usually cosmologists invoke the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric in cosmographic analyses, however generalised approaches allow for analyses outside of any assumed geometrical model. These methods have great promise to be able to model-independently map the cosmic neighborhood where the Universe has not yet converg…

All-sky search for individual Primordial Black Hole bursts with LHAASO
Cao, Aharonian, Bai, Bao, Bastieri, Bi, Bi, Bian, Bukevich, Cai, Cao, Cao, Chang, Chang, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Chen, Cheng, Cheng, Chu, Cui, Cui, Cui, Cui, Dai, Dai, Dai, , Diao, Dong, Duan, Fan, Fan, Fang, Fang, Fang, Feng, Feng, Feng, Feng, Feng, Feng, Feng, Gabici, Gao, Gao, Gao, Gao, Gao, Ge, Ge, Geng, Giacinti, Gong, Gou, Gu, Guo, Guo, Guo, Guo…

All-sky search for individual Primordial Black Hole bursts with LHAASO
Primordial Black Holes~(PBHs) are hypothetical black holes with a wide range of masses that formed in the early universe. As a result, they may play an important cosmological role and provide a unique probe of the early universe. A PBH with an initial mass of approximately $10^{15}$~g is expected to explode today in a final burst of Hawking radiation. In this work, we conduct an all-sky search for individual PBH burst events using the data collected from March 2021 to July 2024 by the Water Che…

An independent estimate of H(z) at z = 0.5 from the stellar ages of brightest cluster galaxies
S. Ilani Loubser, Adebusola B. Alabi, Matt Hilton, Yin-Zhe Ma, Xin Tang, Narges Hatamkhani, Catherine Cress, Rosalind E. Skelton, S. Andile Nkosi
https://arxiv.org/abs/2506.03836

An independent estimate of H(z) at z = 0.5 from the stellar ages of brightest cluster galaxies
Several cosmological observations (e.g., Cosmic Microwave Background (CMB), Supernovae Type Ia, and local distance ladder measurements such as Cepheids) have been used to measure the global expansion rate of the Universe, i.e., the Hubble constant, $H_{0}$. However, these precision measurements have revealed tensions between different probes that are proving difficult to solve. Independent, robust techniques must be exploited to validate results or mitigate systematic effects. We use the Cosmic…

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…

marvel_partnerships: Marvel character partnerships (2018)
A network of partnerships among characters in the Marvel comic book universe. Nodes are either heroes or villains, and edges represent partnerships between such characters. The partnership network was extracted from Wikipedia pages of these characters, which indicate partnership relations with other such pages.
This network has 350 nodes and 346 edges.
Tags: Social, Fictional, Unweighted

"In order to make an apple pie from scratch, you must first create the
universe."
-- Carl Sagan, Cosmos

Nonminimal infrared gravitational reheating in light of ACT
Ayan Chakraborty, Debaprasad Maity, Rajesh Mondal
https://arxiv.org/abs/2506.02141 https://

Nonminimal infrared gravitational reheating in light of ACT
Inflation is known to produce large infrared scalar fluctuations. Further, if a scalar field $(χ)$ is non-minimally coupled with gravity through $ξχ^2 R$, those infrared modes experience \textit{tachyonic instability} during and after inflation. Those large non-perturbative infrared modes can collectively produce hot Big Bang universe upon their horizon entry during the post-inflationary period. We indeed find that for reheating equation of state (EoS), $w_ϕ > 1/3$, and coupling strength, $…

This https://arxiv.org/abs/2503.21368 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Jiutian simulations for the CSST extra-galactic surveys
We provide an overview of the Jiutian simulations, a hybrid simulation suite for the China Space Survey Telescope (CSST) extragalactic surveys. It consists of four complementary modules: the primary runs with high resolutions with the fiducial concordance cosmology, the emulator runs exploring the parameter uncertainties around the fiducial cosmology, the reconstruction runs intended for recovering the observed Universe position by position, and the extension runs employing extended cosmologies…

Parity solves the Strong CP problem
Ravi Kuchimanchi
https://arxiv.org/abs/2506.01911 https://arxiv.org/pdf/2506.01911

Parity solves the Strong CP problem
A recent paper "What can solve the strong CP problem?" goes counter to conventional wisdom by arguing that the universe was in an initial state that combines different eigenstates of $θ$ (of the theta vacuum of QCD), and asserts that for such an initial state, axionless solutions to the Strong CP Problem based on P and CP symmetries will not work. We discuss the nature of the theta vacuum in light of this work, and find that the conventional framing and solutions based on P and CP symmetries a…

Prospects for probing dark matter particles and primordial black holes with the Square Kilometre Array using the 21 cm power spectrum at cosmic dawn
Meng-Lin Zhao, Yue Shao, Sai Wang, Xin Zhang
https://arxiv.org/abs/2507.02651

Prospects for probing dark matter particles and primordial black holes with the Square Kilometre Array using the 21 cm power spectrum at cosmic dawn
Probing the nature of dark matter (DM) remains an outstanding problem in modern cosmology. The 21 cm signal, as a sensitive tracer of neutral hydrogen during cosmic dawn, provides a unique means to investigate DM nature during this critical epoch. Annihilation and decay of DM particles, as well as Hawking radiation of primordial black holes (PBHs), can modify the thermal and ionization histories of the early universe, leaving distinctive imprints on the 21 cm power spectrum. Therefore, the reds…

Resolving Individual Stars in Nearby Large Galaxies with the Habitable Worlds Observatory
Adam Smercina, Tara Fetherolf, Eric W. Koch, Silvia Martocchia, Chris Mihos, Benjamin F. Williams
https://arxiv.org/abs/2507.01960

Resolving Individual Stars in Nearby Large Galaxies with the Habitable Worlds Observatory
The varied and dynamic evolutionary histories of galaxies give rise to the stunning diversity in their properties that we observe in the present-day universe. HST, and now JWST, have pioneered the study of resolved individual stars in the Milky Way and other members of the Local Group, uncovering the drivers of their morphological, star formation, and chemical evolution. HWO will constitute a paradigm shift: introducing the ability to panchromatically resolve the main bodies of every galaxy in …

Symmetries of Hot SM, Magnetic Flux & Baryogenesis from Helicity Decay
Yuta Hamada, Kyohei Mukaida, Fumio Uchida
https://arxiv.org/abs/2507.01576 https…

Symmetries of Hot SM, Magnetic Flux & Baryogenesis from Helicity Decay
We revisit the electroweak crossover of the Standard Model (SM) in the early Universe, focusing on the interplay between generalized global symmetries, magnetic flux dynamics, and baryogenesis. Employing the dimensionally reduced 3d effective field theory of the SM at high temperature, we identify the symmetry structure -- including higher-form and magnetic symmetries -- and analyze their spontaneous breaking patterns across the crossover. We further define a gauge-invariant mixing angle that i…

Interacting Barrow holographic dark energy model in the presence of radiation and matter
Gopinath Guin, Souvik Paul, Sunandan Gangopadhyay
https://arxiv.org/abs/2507.01070

Interacting Barrow holographic dark energy model in the presence of radiation and matter
We have studied the effect of radiation in the interacting barrow holographic dark energy model for a non-flat universe. For both open and closed universes, we have obtained the evolution equation for the density parameters for dark energy, dark matter and radiation for a specific kind of interaction among the seven possible linear interactions; the analysis with the remaining six interactions will be updated soon in this manuscript. We have then numerically solved those coupled differential eq…

New clues on the extended HeII ionization in IZw18 from GTC/MEGARA and JWST/MIRI
A. Arroyo-Polonio, C. Kehrig, J. M. V\'ilchez, J. Iglesias-P\'aramo, E. Perez-Montero, S. Duarte Puertas, J. Gallego, D. Reverte
https://arxiv.org/abs/2507.01742

New clues on the extended HeII ionization in IZw18 from GTC/MEGARA and JWST/MIRI
IZw18 is one of the lowest-metallicity star-forming galaxies known at z$\sim$0, considered a unique local analogue of the first galaxies. The origin of its hard ionizing continuum, expected to be a common feature in the early Universe and traced by He\textsc{ii} emission lines, remains intensely debated and challenging to explain. Here we combine optical (GTC/MEGARA) and mid-infrared (JWST/MIRI) integral field spectroscopic observations for IZw18 to shed new light on the high-ionization phenome…

Gravitational waves from a dilaton-induced, first-order QCD phase transition
Aleksandr Chatrchyan, M. C. David Marsh, Charalampos Nikolis
https://arxiv.org/abs/2507.01191

Gravitational waves from a dilaton-induced, first-order QCD phase transition
We show that a `QCD dilaton' field, whose vacuum expectation value sets the strong coupling, can render the Quantum Chromodynamic (QCD) confinement transition first-order. The QCD dilaton is cosmologically attracted to a false vacuum at weak coupling in the early universe. Quantum tunnelling towards the true vacuum triggers prompt chiral symmetry breaking and confinement of QCD, leading to detonating bubbles of the hadronic phase. We find that plasma sound waves produced by this dilaton-induced…

marvel_partnerships: Marvel character partnerships (2018)
A network of partnerships among characters in the Marvel comic book universe. Nodes are either heroes or villains, and edges represent partnerships between such characters. The partnership network was extracted from Wikipedia pages of these characters, which indicate partnership relations with other such pages.
This network has 350 nodes and 346 edges.
Tags: Social, Fictional, Unweighted

Low-Luminosity Type IIP Supernovae from the Zwicky Transient Facility Census of the Local Universe. II: Lightcurve Analysis
Kaustav K. Das, Mansi M. Kasliwal, Jesper Sollerman, Christoffer Fremling, Takashi J. Moriya, K-Ryan Hinds, Daniel A. Perley, Eric C. Bellm, Tracy X. Chen, Evan P. O'Connor, Michael W. Coughlin, W. V. Jacobson-Galan, Anjasha Gangopadhyay, Matthew Graham, S. R. Kulkarni, Josiah Purdum, Nikhil Sarin, Steve Schulze, Avinash Singh, Daichi Tsuna, Avery Wold

Low-Luminosity Type IIP Supernovae from the Zwicky Transient Facility Census of the Local Universe. II: Lightcurve Analysis
The Zwicky Transient Facility Census of the Local Universe survey yielded a sample of 330 Type IIP supernovae (SNe) with well-constrained peak luminosities. In paper I (arXiv:2502.19493), we measured their luminosity function and volumetric rate. Here (paper II), we present the largest systematic study of lightcurve properties for Type IIP SNe from a volume-limited survey, analyzing a selected subset of 129 events, including 16 low-luminosity Type IIP (LLIIP) SNe with M${r,peak} \geq -16$ mag. …

Chicago-Carnegie Hubble Program (CCHP) A Multi-Wavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. Part II: Theoretical Models and Synthetic Spectra
Barry F. Madore, Wendy L. Freedman, Kayla Owens
https://arxiv.org/abs/2506.01188

Chicago-Carnegie Hubble Program (CCHP) A Multi-Wavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. Part II: Theoretical Models and Synthetic Spectra
This is the second of two papers exploring the effects of metallicity on the multi-wavelength properties of Cepheids in terms of their multi-wavelength period-luminosity (PL) relations, impacting their use as extragalactic distance indicators, underpinning one of the most popular paths to estimating of the expansion rate of the Universe, Ho. In Paper I (Madore & Freedman 2024) we presented five tests for the influence of metallicity on galactic and extragalactic Cepheid PL relations, spanning n…

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…

marvel_partnerships: Marvel character partnerships (2018)
A network of partnerships among characters in the Marvel comic book universe. Nodes are either heroes or villains, and edges represent partnerships between such characters. The partnership network was extracted from Wikipedia pages of these characters, which indicate partnership relations with other such pages.
This network has 350 nodes and 346 edges.
Tags: Social, Fictional, Unweighted

Probing Cosmic Curvature with Fast Radio Bursts and DESI DR2
J\'eferson A. S. Fortunato, Wiliam S. Hip\'olito-Ricaldi, Gustavo E. Romero
https://arxiv.org/abs/2506.01504

Probing Cosmic Curvature with Fast Radio Bursts and DESI DR2
The spatial curvature of the Universe remains a central question in modern cosmology. In this work, we explore the potential of localized Fast Radio Bursts (FRBs) as a novel tool to constrain the cosmic curvature parameter $Ω_k$ in a cosmological model-independent way. Using a sample of 80 FRBs with known redshifts and dispersion measures, we reconstruct the Hubble parameter $H(z)$ via artificial neural networks, which is then used to obtain angular diameter distances $D_A(z)$ through two comp…

A White Paper on The Multi-Messenger Science Landscape in India
Samsuzzaman Afroz, Sanjib Kumar Agarwalla, Dipankar Bhattacharya, Soumya Bhattacharya, Subir Bhattacharyya, Varun Bhalerao, Debanjan Bose, Chinmay Borwanker, Ishwara Chandra C. H., Aniruddha Chakraborty, Indranil Chakraborty, Sovan Chakraborty, Debarati Chatterjee, Varsha Chitnis, Moon Moon Devi, Sanjeev Dhurandhar, Amol Dighe, Bitan Ghosal, Sourendu Gupta, Arpan Hait, Md Emanuel Hoque, Pratik Majumdar, Nilmani Mathur, Har…

A White Paper on The Multi-Messenger Science Landscape in India
The multi-messenger science using different observational windows to the Universe such as Gravitational Waves (GWs), Electromagnetic Waves (EMs), Cosmic Rays (CRs), and Neutrinos offer an opportunity to study from the scale of a neutron star to cosmological scales over a large cosmic time. At the smallest scales, we can explore the structure of the neutron star and the different energetics involved in the transition of a pre-merger neutron star to a post-merger neutron star. This will open up a…

This https://arxiv.org/abs/2505.16380 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

On the Identification of Exotic Compact Binaries with Gravitational Waves: a Phenomenological approach
Gravitational wave (GW) astronomy has been hailed as a gateway to discovering unexpected phenomena in the universe. Over the last decade there have been close to one hundred GW observations of compact-binary mergers. While these signals are largely consistent with mergers of binary black holes, binary neutron stars, or black hole-neutron star systems, some events suggest the intriguing possibility of binaries involving exotic compact objects (ECOs). Identifying and characterising an ECO merger …

Where are all the dark galaxies? Predicting galaxy/halo locations from their bright neighbors
Alice Chen, Niayesh Afshordi
https://arxiv.org/abs/2507.01814

Where are all the dark galaxies? Predicting galaxy/halo locations from their bright neighbors
Astronomical objects in our universe that are too faint to be directly detectable exist and are important - an obvious example being dark matter. The same can also apply to very faint baryonic objects, such as low luminosity dwarf galaxies and gravitationally compact objects (e.g., rogue planets, white dwarfs, neutron stars, black holes, dark sirens). While they are very difficult to observe directly, they have locations that are highly important when studying astrophysical phenomena. Here, we …

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ \alpha $ Profiles Following Delayed Supernova Feedback
James Nianias, Jeremy Lim, Yik Lok Wong, Gordon Wong
https://arxiv.org/abs/2506.20422

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ α$ Profiles Following Delayed Supernova Feedback
Lyman-$ α$ emission, which owing to its resonant nature strongly couples the emergent line profile to gas kinematics, has become a key observable for probing outflows from star-forming galaxies in the early universe. Typically, Lyman-$ α$ profiles are explained in terms of idealised expanding shell models, while empirically-motivated interpretations of Lyman-$ α$ profiles that make use of comparisons with kinematics revealed by other spectral features (e.g. metal emission and absorption line…

The Cosmological analysis of X-ray cluster surveys VII. Bypassing scaling relations with Lagrangian Deep Learning and Simulation-based inference
Nicolas Cerardi, Marguerite Pierre, Fran\c{c}ois Lanusse, Xavier Corap
https://arxiv.org/abs/2507.01820

The Cosmological analysis of X-ray cluster surveys VII. Bypassing scaling relations with Lagrangian Deep Learning and Simulation-based inference
Galaxy clusters, the pinnacle of structure formation in our universe, are a powerful cosmological probe. Several approaches have been proposed to express cluster number counts, but all these methods rely on empirical explicit scaling relations that link observed properties to the total cluster mass. These scaling relations are over-parametrised, inducing some degeneracy with cosmology. Moreover, they do not provide a direct handle on the numerous non-gravitational phenomena that affect the phys…

Discovery of the Hybrid Response of Photoionized Gases
Zhicheng He, Tinggui Wang, Gary J. Ferland
https://arxiv.org/abs/2505.24242 https://

Discovery of the Hybrid Response of Photoionized Gases
Photoionized gases are prevalent throughout the universe. In such gases, the ion concentration typically exhibits two response modes to radiation: a positive response in the low-ionization state and a negative response in the high-ionization state. Here, we report the discovery of a widespread misalignment at the boundary between the above two response modes, and identify a third mode-the hybrid response-through time-dependent photoionization simulations. This phenomenon arises from the asynchr…

Inflationary magnetogenesis beyond slow-roll and its induced gravitational waves
Bill Atkins, Debika Chowdhury, Alisha Marriott-Best, Gianmassimo Tasinato
https://arxiv.org/abs/2507.01772

Inflationary magnetogenesis beyond slow-roll and its induced gravitational waves
The origin of magnetic fields observed on both astrophysical and cosmological scales is a compelling problem that has the potential to shed light on the early Universe. We analytically investigate inflationary magnetogenesis in scenarios where a brief departure from slow-roll inflation - akin to mechanisms proposed for primordial black hole formation - leads to enhanced magnetic field generation with a growing power spectrum. Focusing on the Ratra model, we derive an analytic bound on the growt…

Constraining the magnetic field in the galaxy cluster Abell 2142 using MeerKAT L-band polarisation data
A. Pagliotta, C. J. Riseley, A. Bonafede, C. Stuardi, F. Loi
https://arxiv.org/abs/2507.00114

Constraining the magnetic field in the galaxy cluster Abell 2142 using MeerKAT L-band polarisation data
Magnetic fields permeate the Universe, including galaxy clusters, and affect the thermodynamical properties of the intra-cluster medium (ICM). Cosmological simulations predict that seed magnetic fields are amplified up to the $μ$G-level in the ICM, but the magnetic field strength and structure have been studied in only a few clusters. Abell 2142 is a local massive cluster that shows evidence of a post-merger dynamical state. In this work, we aim to constrain the magnetic field intensity, radia…

Lya2pcf: an efficient pipeline to estimate two- and three-point correlation functions of the Lyman-$\alpha$ forest
Josue De-Santiago, Rafael Guti\'errez-Balboa, Gustavo Niz, Alma X. Gonz\'alez-Morales
https://arxiv.org/abs/2507.00129

Lya2pcf: an efficient pipeline to estimate two- and three-point correlation functions of the Lyman-$α$ forest
Studying the matter distribution in the universe through the Lyman-$α$ forest allows us to constrain small-scale physics in the high-redshift regime. Spectroscopic quasar surveys are generating increasingly large datasets that require efficient algorithms to compute correlation functions. Moreover, cosmological analyses based on Lyman-$α$ forests can significantly benefit from incorporating higher-order statistics alongside traditional two-point correlations. In this work, we present Lya2pcf,…

New Agegraphic Dark Energy Driven Reconstruction of \boldmath{$f(Q)$} Gravity and its Cosmological Implications
Rajdeep Mazumdar, Kalyan Malakar, Mrinnoy M. Gohain, Kalyan Bhuyan
https://arxiv.org/abs/2507.00878

New Agegraphic Dark Energy Driven Reconstruction of \boldmath{$f(Q)$} Gravity and its Cosmological Implications
In this work, we perform reconstruction of \( f(Q) \) gravity inspired by the New Agegraphic Dark Energy (NADE) model, aiming to account for the Universe's late time acceleration without invoking a cosmological constant. Utilizing a power law scale factor \( a(t) = a_0 t^h \), we derive an analytic form for \( f(Q) \) based on a correspondence with NADE, where the conformal time serves as the infrared cutoff. The resulting model naturally recovers General Relativity in the limit and exhibits a …

Flash Ionization of the Early Universe by Pop III.1 Supermassive Stars
Jonathan C. Tan (Chalmers Univ.,Univ. of Virginia)
https://arxiv.org/abs/2506.18490 …

Flash Ionization of the Early Universe by Pop III.1 Supermassive Stars
The Pop III.1 theory for supermassive black hole (SMBH) formation predicts that a substantial fraction of the early universe was ionized by supermassive stars at redshifts $z\sim20-30$, an era we refer to as ``The Flash''. This is followed by recombination to a mainly neutral state within a few tens of Myr. Here we discuss the implication of this ionization for the scattering optical depth of the cosmic microwave background (CMB), $τ$. We find a fiducial contribution of $τ_{\rm PopIII.1}\sim0…

Hints of noncold dark matter? Observational constraints on barotropic dark matter with a constant equation of state parameter
Yan-Hong Yao, Jian-Qi Liu
https://arxiv.org/abs/2507.00478

Hints of noncold dark matter? Observational constraints on barotropic dark matter with a constant equation of state parameter
This study investigates the potential of a cosmological model termed $Λw$DM, in which a cosmological constant play the role of dark energy and dark matter is barotropic and has a constant equation of state parameter ($w_{\rm dm}$), to address the $S_8$ tension between early- and late- universe observations. By incorporating the latest cosmological datasets -- including Planck Cosmic Microwave Background (CMB), Baryon Acoustic Oscillation (BAO), Ia supernovae (SNe Ia), Redshift Space Distortion…