Tootfinder

Consequences of Undecidability in Physics on the #TheoryOfEverything: #universe is a #ComputerSiimulation: https://news.ok.ubc.ca/2025/10/30/ubco-study-debunks-the-idea-that-the-universe-is-a-computer-simulation/ - new study uses logic and physics to definitively answer one of science's biggest questions.

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…

Mathematical Proof Debunks the Idea That the Universe Is a Computer Simulation - Slashdot
https://science.slashdot.org/story/25/10/30/2232258/mathematical-proof-debunks-the-idea-that-the-universe-is-a-computer-simulation

Cars, like everything else now, are mostly made to be data collection devices. You can't collect data on every possible thing without lots of chips, man. Get with the program. How is the AI going to simulate us once it wipes us out if it doesn't collect every possible datapoint it can now? Come on. It's like you don't even WANT humanity to sacrifice itself for the betterment of the universe!

Cars, like everything else now, are mostly made to be data collection devices. You can't collect data on every possible thing without lots of chips, man. Get with the program. How is the AI going to simulate us once it wipes us out if it doesn't collect every possible datapoint it can now? Come on. It's like you don't even WANT humanity to sacrifice itself for the betterment of the universe!

Is 42 the answer to the ultimate question of life, the universe, and everything? Work on The vOICe sensory substitution device for the blind has been ongoing for 42 years now.
Grok: https://x.com/i/grok/share/FcYnQAJ8SxmnoyisMtCgkxz6X
ChatGPT:

Is 42 the answer to the ultimate question of life, the universe, and everything? Work on The vOICe visual-to-auditory sensory substitution device for the blind has been ongoing for 42 years now, starting in 1983.
Yes, according to Douglas Adams' The Hitchhiker's Guide to the Galaxy, 42 is indeed the answer to the ultimate question of life, the universe, and everything—though the question itself remains a mystery, as the supercomputer Deep Thought spent 7.5 million years calculating it only to leave everyone hanging. As for The vOICe (which cleverly stands for

On September 28th, 1867, Toronto officially became the capital city of the new Province of Ontario, and universally accepted as the centre of the universe. It was kind of a pity decision since Toronto had recently lost out to Ottawa when the Queen, the one in England, chose the capital for the Province of Canada. Confederation decreed that the Province of Canada would be split with Canada East becoming Quebec, and Canada West would now be known as Ontario. Toronto got the last laugh because the entire country now revolves around the city, at least in the minds of certain provincial politicians who may or may not want all of Canada to pay for a tunnel under #Hwy401.
#CanadaIsAwesome #CanadianCapitals
https://en.wikipedia.org/wiki/Toronto

Probing the Topology of the Early Universe using CMB Temperature and Polarization Anisotropies
Miguel-Angel Sanchis-Lozano
https://arxiv.org/abs/2509.22106 https://

Probing the Topology of the Early Universe using CMB Temperature and Polarization Anisotropies
The temperature and polarization of the cosmic microwave background (CMB), as measured today, may offer key insights into the topology of the early universe prior to inflation, for example, by discriminating between flat and warped geometries. In this paper, we focus on a Kaluza-Klein model with an extra spatial dimension that compactifies at the Grand Unified Theory (GUT) epoch, subject to mixed Neumann/Dirichlet boundary conditions at fixed points. As a consequence, a set of infrared cutoffs …

Monte Carlo quantum cosmology with a modified Euclidean action
Malaik Kabir, Syed Moeez Hassan
https://arxiv.org/abs/2509.25125 https://arxiv.org/pdf/2509.…

Monte Carlo quantum cosmology with a modified Euclidean action
We numerically study the Euclidean quantum cosmology of a closed, homogeneous and isotropic universe with a cosmological constant. A dust field acts as a clock, and we compute the ground state wavefunction, correlation function, and mean volume of the universe by performing path integral Monte Carlo simulations. To make the path integral convergent, the argument of the exponent in the weight of the path integral is chosen to be either the absolute value of the Euclidean action, or its square. W…

A Less Terrifying Universe? Mundanity as an Explanation for the Fermi Paradox
Robin H. D. Corbet
https://arxiv.org/abs/2509.22878 https://arxiv.org/pdf/250…

A Less Terrifying Universe? Mundanity as an Explanation for the Fermi Paradox
Applying a principle of "radical mundanity", this paper examines explanations for the lack of strong evidence for the presence of technology-using extraterrestrial civilizations (ETCs) in the Galaxy - the Fermi paradox. With this principle, the prospect that the Galaxy contains a modest number of civilizations is preferred, where none have achieved technology levels sufficient to accomplish large-scale astro-engineering or lack the desire to do so. This consideration also leads to the expectati…

Probing the bubble interior with entanglement entropy and bulk-cone singularities
Roberto Auzzi, Stefano Baiguera, Lihan Guo, Giuseppe Nardelli, Nicol\`o Zenoni
https://arxiv.org/abs/2509.21632

Probing the bubble interior with entanglement entropy and bulk-cone singularities
In the thin wall approximation, we study a class of asymptotically AdS black holes which contain a spherically symmetric vacuum bubble with a different (positive or negative) cosmological constant. Collapsing, expanding, and static bubble solutions are considered. Among these, expanding bubbles with positive cosmological constant can provide a way to apply the AdS/CFT correspondence to describe the physics of an expanding universe. We systematically study the causal structure of the solutions a…

Revisiting constraints on magnetogenesis from baryon asymmetry
Yuta Hamada, Kyohei Mukaida, Fumio Uchida
https://arxiv.org/abs/2509.23858 https://arxiv.org…

Revisiting constraints on magnetogenesis from baryon asymmetry
Magnetic fields in the universe potentially serve as a messenger of primordial physics. The observationally suggested intergalactic magnetic fields may be a relic of helical primordial $\mathrm{U}(1)_Y$ magnetic fields, which may also explain the origin of the baryon asymmetry of the universe. This scenario has been considered to be not viable, which we revisit as well as the baryon isocurvature problem for non-helical primordial $\mathrm{U}(1)_Y$ magnetic fields, based on the recent discussion…

Generation of Grothendieck topologies, provability and operations on subtoposes
Olivia Caramello, Laurent Lafforgue
https://arxiv.org/abs/2508.21134 https://

Generation of Grothendieck topologies, provability and operations on subtoposes
After reviewing the multiple roles of toposes - as generalized topological spaces, as universal invariants, as categorical analogues of the set-theoretic universe, and as semantic environments for first-order theories - we recall the notion of subtopos and its dual expression: both in terms of Grothendieck topologies and in terms of first-order logic. We emphasize the significance of this duality, which enables the translation of provability problems in first-order logic into problems concernin…

Unveiling Obscured Accretion in the Local Universe
Indrani Pal, Stefano Marchesi, Ross Silver, Marco Ajello, Vittoria Gianolli, N\'uria Torres-Alb\`a, Isaiah Cox, Xiurui Zhao, Dhrubojyoti Sengupta, Anuvab Banerjee, Kouser Imam, Andrealuna Pizzetti
https://arxiv.org/abs/2509.21532

Unveiling Obscured Accretion in the Local Universe
Heavily obscured Active Galactic Nuclei (AGN), especially Compton-thick sources with line-of-sight column density ($N_{\rm H,los}$) $>$ 10$^{24}$ cm$^{-2}$, are critical to understanding supermassive black hole (SMBH) growth and the origin of the Cosmic X-ray Background (CXB). However, their observed fraction remains significantly below model predictions, due to strong absorption bias, even in the hard X-ray (i.e., above 10 keV) band. We analyze a sample of 26 nearby ($z < 0.1$) AGN from the Sw…

Observing compact Pop III star clusters and the presence of cosmic streaming
Claire E. Williams, Smadar Naoz, Naoki Yoshida, William Lake, Blakesley Burkhart, Federico Marinacci, Mark Vogelsberger, Shyam H. Menon, Avi Chen, Kyle Kremer
https://arxiv.org/abs/2509.22776

Observing compact Pop III star clusters and the presence of cosmic streaming
The formation of the Universe's first luminous stellar structures depends on the unique conditions at "Cosmic Dawn," which are set by the underlying cosmological model and early baryonic physics. Observations suggest that high-$z$ star clusters reached stellar surface densities above $10^5 M_\odot$ pc$^{-2}$, suggesting scenarios where models predict that the ability of stellar feedback to counter gravitational collapse is severely limited. We investigate the first star clusters in a suite of A…

Improved Limits on the 21 cm Signal at z = 6.5–7.0 (the Epoch of #Reionization) with the Murchison Widefield Array Using Gaussian Information: https://iopscience.iop.org/article/10.3847/1538-4357/adff80 -> Astronomers hunting for evidence of the light from the first stars and galaxies have found that the Universe was warm, rather than cold, before it “lit up”: https://www.icrar.org/eor-limit/

Investigating non-LTE abundances of Neodymium (Nd) in metal-poor FGK stars
John D. Dixon (Texas A&M University), Rana Ezzeddine (University of Florida), Yangyang Li (University of Florida), Thibault Merle (Institut d'Astronomie et d'Astrophysique and Brussels Laboratory of the Universe, Royal Observatory of Belgium), Manuel Bautista (United States Department of Energy), Yanjun Guo (Chinese Academy of Sciences)

Investigating non-LTE abundances of Neodymium (Nd) in metal-poor FGK stars
The dominant site(s) of the $r$-process are a subject of current debate. Ejecta from $r$-process enrichment events like kilonovae are difficult to directly measure, so we must instead probe abundances in metal-poor stars to constrain $r$-process models. This requires state-of-the-art Non-Local Thermodynamic Equilibrium (NLTE) modeling, as LTE is a poor approximation for the low-opacity atmospheres of metal-poor giants. Neodymium (Nd) is a prominent $r$-process element detected in both near-infr…

I was reading somewhere an explanation for why the night skies are not totally whited out by the brazillions of galaxies and stars in the universe. Spoiler: it’s cuz some of them are so far away their light hasn’t reached us yet, and some are moving away from us so their light will be mega-redshifted. So if a star or galaxy is far enough away & moving away from us, will it wink out at some point when it zooms beyond the threshold?

Wake up sheeple.
#ShamelesslyStolenFromTheFacebook

Exploring the Early Universe with Deep Learning
Emmanuel de Salis, Massimo De Santis, Davide Piras, Sambit K. Giri, Michele Bianco, Nicolas Cerardi, Philipp Denzel, Merve Selcuk-Simsek, Kelley M. Hess, M. Carmen Toribio, Franz Kirsten, Hatem Ghorbel
https://arxiv.org/abs/2509.22018

Exploring the Early Universe with Deep Learning
Hydrogen is the most abundant element in our Universe. The first generation of stars and galaxies produced photons that ionized hydrogen gas, driving a cosmological event known as the Epoch of Reionization (EoR). The upcoming Square Kilometre Array Observatory (SKAO) will map the distribution of neutral hydrogen during this era, aiding in the study of the properties of these first-generation objects. Extracting astrophysical information will be challenging, as SKAO will produce a tremendous amo…

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…

A nearly pristine #star from the Large Magellanic Cloud: https://arxiv.org/abs/2509.21643 -> "This star has the most pristine composition of any object known in the universe. The star's orbit indicates that it originates from the halo of the Large Magellanic Cloud. Its detailed chemical composition implies a supernova progenitor with initial mass of 30 solar masses."

Discord banning people who aren’t even pedos while the real pedos host karaoke in public servers is peak digital clown show. The mods spin in circles, the code eats itself, and everyone claps like this isn’t the dumbest apocalypse ever written.
The pedos stay untouched while the falsely banned fade into the void, posting screenshots from exile. The machine coughs, the users laugh, and the universe hums in white noise, pretending it’s all part of moderation.

A Five-dimensional Kaluza-Klein Approach to Unimodular Gravity
J\'ulio C. Fabris, Richard Kerner
https://arxiv.org/abs/2509.24578 https://arxiv.org/pdf…

A Five-dimensional Kaluza-Klein Approach to Unimodular Gravity
In this article we present a possibility of imposing the unimodular condition within the 5-dimensional Kaluza-Klein theory including the scalar field. Unimodular gravity became an object of increasing interest in the late 80-ties; and was recently used in primordial Universe modeling with cosmological constant, in the context of the Brans-Dicke gravity including scalar field. A generalization of the unimodularity principle to the 5-dimensional Kaluza-Klein model was discussed in our recent pape…

@…
"Never believe that the Creator didn’t have a sense of humor when she invented something as damnable as spinors to describe all the ordinary matter in the universe, including you."
--William O. Straub from "A Child’s Guide to Spinors"

BBN bounds on neutrinophilic ultralight Dark Matter
Toni Bert\'olez-Mart\'inez, Justo L\'opez-Sarri\'on, Jordi Salvado
https://arxiv.org/abs/2509.22867 https://

BBN bounds on neutrinophilic ultralight Dark Matter
The high densities in the early Universe provide a unique laboratory to constrain couplings between feebly interacting particles, such as dark matter and neutrinos. In this article, we study how Big Bang Nucleosynthesis can constrain models of Ultra-Light Dark Matter diagonally coupled to neutrinos. We follow an adiabatic formalism which allows to average-out the rapid oscillations of the Dark Matter field and consistently take into account the feedback between the neutrino and the Dark Matter …

Aurora -- across the universe
https://inv.nadeko.net/Zb4sIiGLXvc

Modified Cosmology or Modified Galaxy Astrophysics is Driving the z>6 JWST Results? CMB Experiments can discover the Origin in Near Future
Harsh Mehta, Suvodip Mukherjee
https://arxiv.org/abs/2509.21952

Modified Cosmology or Modified Galaxy Astrophysics is Driving the z>6 JWST Results? CMB Experiments can discover the Origin in Near Future
The massive and bright galaxies observed by the James Webb Space Telescope (JWST) at high redshifts ($z > 6$) have challenged our understanding of the Universe. This may require revisiting the physics of galaxy formation and evolution, or modifying the $Λ$CDM cosmological model to explain these observations, or both. We show that high-resolution CMB experiments such as the Simons Observatory (or CMB-S4) can measure smoking-gun signatures jointly in weak lensing and kinematic Sunyaev-Zeldovich …

halox: Dark matter halo properties and large-scale structure calculations using JAX
Florian K\'eruzor\'e
https://arxiv.org/abs/2509.22478 https://a…

halox: Dark matter halo properties and large-scale structure calculations using JAX
Dark matter halos are fundamental structures in cosmology, forming the gravitational potential wells hosting galaxies and clusters of galaxies. Their properties and statistical distribution (including the halo mass function) are invaluable tools to infer the fundamental properties of the Universe. The \texttt{halox} package is a JAX-powered Python library enabling differentiable and accelerated computations of key properties of dark matter halos, and of the halo mass function. The automatic dif…

So....let's talk 2nd season of #Pantheon and cyberspace fight scenes.
The show needed to depict AIs in a universe that shouldn't need to obey any laws of physics. Yet they chose to depict them as superheroes in an earth-like world. This already limits things.
#Invincible was rea…

#DonnaDErrico always claims to be unable to swim and terrified of water, but she filmed several scenes like this in her years in the Baywatch Universe.
Baywatch Nights 2x08 - Last Breath
#RandomBaywatch

I love Mortal Engines and i love reading stories in that universe. If you like those perfect books you will also enjoy this. Not on the same level as the OG series.
#books #reading

In any case, day 2: Ursula K Le Guin.
As I've said elsewhere, part of her science fiction thesis is that "human" can encompass much more than what we mere Terrans think of it as, and that moral standing extends broadly throughout the universe. This is the antithesis of Tokens fantasy, wherein "race" is real and determines moral standing. For Le Guin, it's barely okay to intervene in complex alien politics unless you carefully ensure you're not causing systemic harms; for Tolkien, it's okay to ambush and murder orc children, because they are by nature evil.
Add to her excellent politics Le Guin's masterful worldbuilding and unparalleled range of plots, and you have the one author I loved as a decidedly liberal and naïve teen and love even more now that I'm an adult. She's an absolute legend and deserves a very high place on any list of women authors (or list of authors, period.).
For a short story, try "The Ones Who Walk Away From Omelas" which you can read here: https://www.utilitarianism.com/nu/omelas.pdf
For fantasy "A Wizard of Earthsea" (also has a nice graphic novel adaptation), or for science fiction, "The Left Hand of Darkness" or if you want a more anarchist flavor, "The Dispossessed."
I'll close this with an amazing quote from her:
"""
We live in capitalism. Its power seems inescapable. So did the divine right of kings. Any human power can be resisted and changed by human beings. Resistance and change often begin in art, and very often in our art, the art of words.
"""

GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star
Eliza Neights, Eric Burns, Chris L. Fryer, Dmitry Svinkin, Suman Bala, Rachel Hamburg, Ramandeep Gill, Michela Negro, Megan Masterson, James DeLaunay, David J. Lawrence, Sophie E. D. Abrahams, Yuta Kawakubo, Paz Beniamini, Christian Aa. Diget, Dmitry Frederiks, John Goldsten, Adam Goldstein, Alexander D. Hall-Smith, Erin Kara, Alison M. Laird, Gavin P. Lamb, Oliver J. Roberts, Ryan Seeb, V. Ashley Villar,…

GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star
Gamma-ray bursts are the most luminous electromagnetic events in the universe. Their prompt gamma-ray emission has typical durations between a fraction of a second and several minutes. A rare subset of these events have durations in excess of a thousand seconds, referred to as ultra-long gamma-ray bursts. Here, we report the discovery of the longest gamma-ray burst ever seen with a ~25,000 s gamma-ray duration, GRB 250702B, and characterize this event using data from four instruments in the Int…

Electric Dipole Moments and New Physics
Maxim Pospelov, Adam Ritz
https://arxiv.org/abs/2509.23531 https://arxiv.org/pdf/2509.23531

Electric Dipole Moments and New Physics
Searches for intrinsic electric dipole moments (EDMs) of nucleons, atoms and molecules are precision flavor-diagonal probes of new $CP$-odd physics, as motivated by the need to explain the matter-antimatter asymmetry in the universe. We review and summarise the effective field theory analysis of the observable EDMs in terms of a general set of $CP$-odd operators at 1~GeV, and the ensuing model-independent constraints on new physics. We also review and discuss the EDMs induced by $CP$-violation …

The UK Royals Cinemetic Universe

Is ozone a reliable proxy for molecular oxygen? III. The impact of CH$_4$ on the O$_2$-O$_3$ relationship for Earth-like atmospheres
Thea Kozakis, Jo\~ao M. Mendon\c{c}a, Lars A. Buchhave, Luisa M. Lara
https://arxiv.org/abs/2508.19062

Is ozone a reliable proxy for molecular oxygen? III. The impact of CH$_4$ on the O$_2$-O$_3$ relationship for Earth-like atmospheres
In the search for life in the Universe, molecular oxygen (O$_2$) combined with a reducing species, such as methane (CH$_4$), is considered a promising disequilibrium biosignature. In cases where it would be difficult or impossible to detect O$_2$ (e.g., mid-IR or low O$_2$ levels), it has been suggested that ozone (O$_3$), the photochemical product of O$_2$, could be used as a proxy for determining the abundance of O$_2$. As the O$_2$-O$_3$ relationship is nonlinear, the goal of this series of …

“We are not angels who view the universe from the outside,” Hawking told me. “Our theories are never decoupled from us.”
https://theconversation.com/stephen-hawking-and-i-created-his-final-theory-of-the-cosmos-heres-what-it-reveals-about-the-origins-of-time-and-life-204824

Upper Limits on the Isotropic Gravitational-Wave Background from the first part of LIGO, Virgo, and KAGRA's fourth Observing Run
The LIGO Scientific Collaboration, et al.
https://arxiv.org/abs/2508.20721

Upper Limits on the Isotropic Gravitational-Wave Background from the first part of LIGO, Virgo, and KAGRA's fourth Observing Run
We present results from the search for an isotropic gravitational-wave background using Advanced LIGO and Advanced Virgo data from O1 through O4a, the first part of the fourth observing run. This background is the accumulated signal from unresolved sources throughout cosmic history and encodes information about the merger history of compact binaries throughout the Universe, as well as exotic physics and potentially primordial processes from the early cosmos. Our cross-correlation analysis revea…

Graph-based Analysis for Revealing the Stochastic Gravitational Wave Background in Pulsar Timing Arrays
M. Alakhras, S. M. S. Movahed
https://arxiv.org/abs/2509.24904 https://…

Graph-based Analysis for Revealing the Stochastic Gravitational Wave Background in Pulsar Timing Arrays
The stochastic gravitational wave background (SGWB) reveals valuable information about its origin and the Universe. The pulsar timing arrays (PTAs) are suitable indicators for detecting SGWB within the nano-Hertz frequency range. In this work, we propose a graph-based method implemented on the pulsar timing residuals (PTRs) for SGWB detection and examining uncertainties of its parameters. We construct a correlation graph with pulsars as its nodes, and analyze the graph-based summary statistics,…

Are most sentences unique? An empirical examination of Chomskyan claims
Hiram Ring
https://arxiv.org/abs/2509.19108 https://arxiv.org/pdf/2509.19108…

Spherical solutions to the Klein-Gordon equation in the expanding universe
Karen Yagdjian
https://arxiv.org/abs/2508.15812 https://arxiv.org/pdf/2508.15812…

Spherical solutions to the Klein-Gordon equation in the expanding universe
We produce an explicit formula for the wave function of the spherically symmetric fields emitted to the FLRW universe with the scale factor generated by the de Sitter universe. As an application of these explicitly written solutions of the Klein-Gordon equation, we test the decay in time of the field generated by a pionic atom.

Pion dark matter in a $\theta$ vacuum: a thermal relic with sharp velocity-dependent self-interactions
Camilo Garc\'ia-Cely, Giacomo Landini, Luca Marsili, \'Oscar Zapata
https://arxiv.org/abs/2508.21121

Pion dark matter in a $θ$ vacuum: a thermal relic with sharp velocity-dependent self-interactions
As recently proposed, a non-vanishing topological angle may play a central role in QCD-like theories of dark matter (DM). In this work, we introduce a dark photon portal to the Standard Model in order to establish thermal equilibrium in the early Universe, and discuss the ensuing phenomenological constraints, including the stability of DM. The resulting dynamics accounts for the observed DM relic abundance and yields velocity-dependent DM self-interactions in astrophysical halos. Due to the sha…

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 universe is on my side this morning. Breakfast was a delicious hot salmon sandwich left over from the picnic @… brought to me at lunchtime yesterday, together with the last few spoonfuls of coleslaw. I fumbled the coleslaw tub and it just glided to the floor right side up with the loss of just one wee shred of cabbage. A different day I'd have been w…

A Vast ‘Cosmic Web’ Connects the Universe—Really. Now, We Can Emulate It. https://www.404media.co/a-vast-cosmic-web-connects-the-universe-really-now-we-can-emulate-it/

i do fedi by just putting shit into drafts and firing one im feeling off before i start disliking it again. scrolling thru my large collection, i feel like its too easy to tell which clumps of drafts i was manic during lol

Polymer Bianchi-I with polymer matter
Aleena Zulfiqar, Syed Moeez Hassan
https://arxiv.org/abs/2509.24586 https://arxiv.org/pdf/2509.24586

Polymer Bianchi-I with polymer matter
We analyze the effective dynamics of a polymer quantized homogeneous and anisotropic Bianchi-I universe coupled to a polymer quantized scalar field. We use a pressureless dust field as an internal clock, and work with the gravitational Misner variables. We find that for a consistent polymer quantization of the anisotropies, the volume variable has to be polymerized first, and that a choice of different polymer scales for the two leads to substantially different dynamics. We derive an effective …

A non-inflationary solution to the monopole problem
Daniele Perri
https://arxiv.org/abs/2509.23726 https://arxiv.org/pdf/2509.23726

A non-inflationary solution to the monopole problem
Magnetic monopoles are a long-standing prediction of Grand Unified Theories, yet their efficient production in early universe phase transitions would lead to a monopole abundance that far exceeds observational limits. The standard solution of the problem invokes inflation occurring after monopole production, diluting their density to undetectable levels and eliminating any possibility of present-day observation. Here, we propose an alternative solution based on the breaking, in the early univer…

Impact of rotation on magnetic field stability and orientation in isolated neutron stars
Fabrizio Venturi Pi\~nas, Anson Ka Long Yip, Patrick Chi-Kit Cheong, Milton Ruiz
https://arxiv.org/abs/2508.20220

Impact of rotation on magnetic field stability and orientation in isolated neutron stars
Neutron stars are the most compact horizonless objects in the Universe, exhibiting the strongest known magnetic fields. They are potential sources of coincident gravitational waves and electromagnetic radiation across the entire spectrum. However, the internal configuration of their magnetic fields and the mechanisms that stabilize them remain open questions. As a step forward in understanding the timescale for the emergence of magnetic instabilities that disrupt stellar field configurations, w…

Constraining GREA, an alternative theory accounting for the present cosmic acceleration
R. Calderon, J. Garcia-Bellido, B. Vos-Gines, V. Gonzalez-Perez, A. Shafieloo, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, J. E. Forero-Romero, E. Gazta\~naga, S. Gontcho A Gontcho, G. Gutierrez, K. Honscheid, C. Howlett, M. Ishak, R. Joyce, R. Kehoe, T. Kisner, A. Kremin, O. Lahav, A. Lambert, M. Landriau, M. Manera, R. Miquel, F. Prada, I. Perez-Rafols, E. Sanchez,…

Constraining GREA, an alternative theory accounting for the present cosmic acceleration
The origin of the Universe's late-time accelerated expansion remains unknown. The General Relativistic Entropic Acceleration (GREA) theory offers a compelling alternative to $Λ$CDM, attributing cosmic acceleration to entropy growth associated with cosmic and black hole horizons, without invoking a cosmological constant. We test GREA against the latest DESI DR2 Baryon Acoustic Oscillations (BAO), multiple Type Ia supernova compilations (Union3, Pantheon$\texttt{+}$, DES-SN5YR), and cosmic micro…

The life and times of dark matter haloes: what will I be when I grow up?
Julian Onions, Frazer Pearce, Alexander Knebe, Meghan Gray, Roan Haggar, Ulrike Kuchner, Ana Contreras-Santos, Gustavo Yepes, Weiguang Cui
https://arxiv.org/abs/2508.18778

The life and times of dark matter haloes: what will I be when I grow up?
Are the most massive objects in the Universe today the direct descendants of the most massive objects at higher redshift? We address this question by tracing the evolutionary histories of haloes in the MultiDark Planck2 simulation. By following the 100 most massive halos at $z = 0$ across cosmic time, we find that only 40\% of them were among the largest 100 halos at $z = 1$. This suggests that many of today's most massive clusters were not the most dominant structures at earlier times, while s…

J-PLUS: Understanding outlier white dwarfs in the third data release via dimensionality reduction
C. L\'opez-Sanjuan, P. -E. Tremblay, A. del Pino, H. Dom\'inguez S\'anchez, H. V\'azquez Rami\'o, A. Ederoclite, A. J. Cenarro, A. Mar\'in-Franch, B. Anguiano, T. Civera, P. Cruz, J. A. Fern\'andez-Ontiveros, F. M. Jim\'enez-Esteban, A. Rebassa-Mansergas, J. Vega-Ferrero, J. Alcaniz, R. E. Angulo, D. Crist\'obal-Hornillos, R. A. Dupke, C. Hern\'andez…

J-PLUS: Understanding outlier white dwarfs in the third data release via dimensionality reduction
We present the white dwarf catalog derived from the third data release of the Javalambre Photometric Local Universe Survey (J-PLUS DR3), which covers 3284 deg2 using 12 optical filters. A particular focus is given to the classification of outlier sources. We applied a Bayesian fitting process to the 12-band J-PLUS photometry of white dwarf candidates from Gaia EDR3. The derived parameters were effective temperature, surface gravity, and parallax. We used theoretical models from H- and He-domina…

Optimized Observation Sequencing in Low-Earth Orbit with the SPHEREx Survey Planning Software
Sean Bryan, James Bock, Thomas Burk, Tzu-Ching Chang, Brendan P. Crill, Ari Cukierman, Olivier Dore, C. Darren Dowell, Gregory Dubois-Felsmann, Beth Fabinsky, Sergi Hildebrandt-Rafels, Howard Hui, Kyle Hughes, Phillip Korngut, Philip Mauskopf, Julian Mena, Chi Nguyen, Milad Pourrahmani, Dustin Putnam, Keshav Ramanathan, Flora Ridenhour, Cody Roberson, Amy Trangsrud, Stephen Unwin, Pao-Yu Wang,…

Optimized Observation Sequencing in Low-Earth Orbit with the SPHEREx Survey Planning Software
SPHEREx is a NASA infrared astronomy mission that launched on March 12th, 2025 and is operating successfully in low-Earth orbit (LEO). The mission is currently observing the entire sky in 102 spectral channels in four independent all-sky surveys and also achieves enhanced coverage in two deep fields. This data will resolve key science questions about the early universe, galaxy formation, and the origin of water and biogenic molecules. In this paper, we describe the survey planning software (SPS…

Double Wick rotations between symmetries of Taub-NUT, near-horizon extreme Kerr, and swirling spacetimes
Aimeric Coll\'eaux, Ivan Kol\'a\v{r}, Tom\'a\v{s} M\'alek
https://arxiv.org/abs/2509.22309

Double Wick rotations between symmetries of Taub-NUT, near-horizon extreme Kerr, and swirling spacetimes
We explicitly show that certain 4-dimensional infinitesimal group actions with 3-dimensional orbits are related by double Wick rotations. In particular, starting with the symmetries of the spherical/hyperbolic/planar Taub-NUT spacetimes, one can obtain symmetries of the near-horizon extreme Kerr (NHEK) geometry or swirling universe by complex analytic continuations of coordinates. Similarly, the static spherical/hyperbolic/planar symmetries (i.e., symmetries of the Schwarzschild spacetime and o…

Gravitational waves from axion inflation in the gradient expansion formalism II: Fermionic axion inflation
Richard von Eckardstein, Kai Schmitz, Oleksandr Sobol
https://arxiv.org/abs/2509.25013

Gravitational waves from axion inflation in the gradient expansion formalism II: Fermionic axion inflation
Axion inflation represents an intriguing source of gravitational waves (GWs) from the early Universe. In a companion paper arXiv:2508.00798, we previously leveraged the gradient expansion formalism (GEF) to investigate pure axion inflation (PAI), i.e., axion inflaton coupled to a pure gauge sector. In this paper, we extend our analysis to fermionic axion inflation (FAI), i.e., we allow for the presence of fermions in the gauge sector. PAI predicts a strongly blue-tilted GW spectrum; in our GEF …

Complete Gravitational-Wave Spectrum of the #Sun: https://journals.aps.org/prl/abstract/10.1103/gtwg-pr41 -> Gravitationswellen von der Sonne: https://pro-physik.de/nachrichten/gravitationswellen-von-der-sonne - laut einer Arbeit des IFIC, des DESY und des Exzellenzclusters Quantum Universe der Universität Hamburg strahlt unser Heimatstern ultraschwache Gravitationswellen über ein enormes Frequenzspektrum aus.

Fair Universe Higgs Uncertainty Challenge
Ragansu Chakkappai (Universit\'e Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France, ChaLearn, USA), Wahid Bhimji (Lawrence Berkeley National Laboratory, Berkeley, USA), Paolo Calafiura (Lawrence Berkeley National Laboratory, Berkeley, USA), Po-Wen Chang (Lawrence Berkeley National Laboratory, Berkeley, USA), Yuan-Tang Chou (University of Washington, Seattle, USA), Sascha Diefenbacher (Lawrence Berkeley National Laboratory, Berkeley, USA), Jor…

Fair Universe Higgs Uncertainty Challenge
This competition in high-energy physics (HEP) and machine learning was the first to strongly emphasise uncertainties in $(H \rightarrow τ^+ τ^-)$ cross-section measurement. Participants were tasked with developing advanced analysis techniques capable of dealing with uncertainties in the input training data and providing credible confidence intervals. The accuracy of these intervals was evaluated using pseudo-experiments to assess correct coverage. The dataset is now published in Zenodo, and t…

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

the universe does not just evolve. It remembers.
https://theconversation.com/information-could-be-a-fundamental-part-of-the-universe-and-may-explain-dark-energy-and-dark-matter-265415

Driven inhomogeneous CFT as a theory in curved space-time
Johanna Erdmenger, Jani Kastikainen, Tim Schuhmann
https://arxiv.org/abs/2508.18350 https://arxiv…

Driven inhomogeneous CFT as a theory in curved space-time
For two-dimensional conformal field theories driven by evolving background space-time metrics in a closed universe, we present an operator formulation as a driven inhomogeneous CFT. The Hamiltonian of this theory is given by a background space-time dependent smearing of the stress tensor over the spatial slice. Emphasis is placed on the treatment of the curved-space Weyl anomaly, which we show is realized by the difference between Schrödinger and Heisenberg picture Hamiltonians once an appropr…

A GLIMPSE of Intermediate Mass Black holes in the epoch of reionization: Witnessing the Descendants of Direct Collapse?
Qinyue Fei, Seiji Fujimoto, Rohan P. Naidu, John Chisholm, Hakim Atek, Gabriel Brammer, Yoshihisa Asada, Volker Bromm, Lukas J. Furtak, Jenny E. Greene, Tiger Yu-Yang Hsiao, Junehyoung Jeon, Vasily Kokorev, Jorryt Matthee, Priyamvada Natarajan, Johan Richard, Alberto Saldana-Lopez, Daniel Schaerer, Marta Volonteri, Adi Zitrin

A GLIMPSE of Intermediate Mass Black holes in the epoch of reionization: Witnessing the Descendants of Direct Collapse?
JWST has revealed an abundance of supermassive black holes (BHs) in the early Universe, and yet the lowest mass seed black holes that gave rise to these populations remain elusive. Here we present a systematic search for broad-line Active Galactic Nuclei (AGNs) in some of the faintest high-$z$ galaxies surveyed yet by combining ultra-deep JWST/NIRSpec G395M spectroscopy with the strong lensing aid in Abell S1063. By employing the profile of the [OIII]$λ5007$ emission lines as a template for na…

GWTC-4.0 - An Introduction to Version 4.0 of the Gravitational-Wave Transient Catalog and three more papers: #GravitationalWave detection Rainer Weiss has died at 92: https://www.space.mit.edu/news/professor-emeritus-rainer-weiss-influential-physicist-who-forged-new-paths-to-understanding-the-universe-dies-at-92/

Solar peculiar motion inferred from dipole anisotropy in redshift distribution of quasars appears to lie along the Galactic Centre direction
Ashok K. Singal
https://arxiv.org/abs/2508.20769

Solar peculiar motion inferred from dipole anisotropy in redshift distribution of quasars appears to lie along the Galactic Centre direction
According to the Cosmological Principle an observer stationary with respect to the comoving coordinates of the expanding universe should find the redshift distribution of distant quasars to be isotropic. However, the observed redshift distribution in a large sample of 1.3 million quasars shows a significant dipole anisotropy. A peculiar motion of the observer could introduce such a dipole anisotropy in the observed redshift distribution. However, the motion inferred therefrom turns out to be no…

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…

Testing $f(T)$ Gravity with Cosmological Observations: Confronting the Hubble Tension and Implications for the Late-Time Universe
Saurabh Verma, Archana Dixit, Anirudh Pradhan, M. S. Barak
https://arxiv.org/abs/2508.20107

Testing $f(T)$ Gravity with Cosmological Observations: Confronting the Hubble Tension and Implications for the Late-Time Universe
In recent years, modifications to General Relativity (GR) have been explored to address cosmological observations, particularly in the context of late-time cosmic acceleration. Among these, modifications based on the Teleparallel Equivalent of General Relativity (TEGR), particularly $f(T)$ gravity, have gained significant attention. In this work, we investigate the scalar perturbations in $f(T)$ gravity, focusing on how these perturbations modify the Poisson and lensing equations and how they i…

Incorporating curved geometry in cosmological simulations
Julian Adamek, Renan Boschetti
https://arxiv.org/abs/2508.20606 https://arxiv.org/pdf/2508.20606

Incorporating curved geometry in cosmological simulations
Spatial curvature is one of the fundamental cosmological parameters that is routinely constrained from observations. The forward modelling of observations, in particular of large-scale structure, often relies on large cosmological simulations. While the so-called separate universe approach allows one to account for the effect of curvature on the expansion rate in small sub-volumes, the non-Euclidean geometry is harder to accommodate. It becomes important when observables are computed over large…

Correcting the fiber-aperture bias affecting galaxy stellar populations in the Sloan Digital Sky Survey. Aperture corrections to absorption indices based on CALIFA integral field observations
Stefano Zibetti (INAF-Arcetri Astrophysical Observatory, Firenze, Italy), Jacopo Pratesi (INAF-Arcetri Astrophysical Observatory, Firenze, Italy, Universit\`a degli Studi di Firenze, Italy), Anna R. Gallazzi (INAF-Arcetri Astrophysical Observatory, Firenze, Italy), Daniele Mattolini (Universit\`a …

Correcting the fiber-aperture bias affecting galaxy stellar populations in the Sloan Digital Sky Survey. Aperture corrections to absorption indices based on CALIFA integral field observations
Stellar population properties are crucial for understanding galaxy evolution. Their inference for statistically representative samples requires deep multi-object spectroscopy, typically obtained with fiber-fed spectrographs that integrate only a fraction of galaxy light. The most comprehensive local Universe dataset is the Sloan Digital Sky Survey (SDSS), whose fibers typically collected ~30% of total flux. Stellar population gradients, ubiquitously present in galaxies, systematically bias SDSS…

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 Einstein Telescope Pathfinder and its Vacuum System
Thomas H\"ohn (ET-PF), Adrian Schwenck (ET-PF), Thomas Th\"ummler (ET-PF), Joachim Wolf (ET-PF), Ralph Engel (ET-PF), Andreas Haungs (ET-PF), Einstein Telescope Pathfinder (ET-PF), collaboration
https://arxiv.org/abs/2508.16461

The Einstein Telescope Pathfinder and its Vacuum System
The Einstein Telescope (ET) will be the next generation gravitational wave observatory in Europe with a sensitivity reaching beyond the CMB into the dark era of the Universe. Each corner of the triangular baseline design is the center of two interferometers with 10 km long arms, one operated at room temperature, the other one with mirrors at cryogenic temperatures of 10-15 K that reduce the noise contribution at frequencies as low as 3 Hz. The ETpathfinder (ET-PF) project at Maastricht Universi…

CMB Hemispherical Power Asymmetry from Early Phase of Inflation
Akash Gandhi, Mohit Panwar, Pankaj Jain
https://arxiv.org/abs/2509.24712 https://arxiv.org/…

CMB Hemispherical Power Asymmetry from Early Phase of Inflation
We investigate the hemispherical power asymmetry observed in the CMBR by attributing it to an early inhomogeneous phase of cosmic expansion. Unlike the conventional assumption of a perfectly isotropic and homogeneous pre-inflationary Universe, we introduce a small inhomogeneous perturbation, treated within a perturbative framework. Our analysis builds on previously developed empirical models of inhomogeneous primordial power spectrum models based on dipole modulation. Using in-in formalism, we …

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- On the Accelerated Expansion of the Universe
Naman Kumar
https://

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

Signals of Bursts from the Very Early Universe / Positron signal from the early Univere [sic!]: #universe.

Chemical and Kinetic Equilibrium in Cosmology: Facts and Myths
Stefano Profumo
https://arxiv.org/abs/2508.20988 https://arxiv.org/pdf/2508.20988

Chemical and Kinetic Equilibrium in Cosmology: Facts and Myths
We clarify that chemical and kinetic equilibration in the early Universe are distinct: neither implies the other, and the ordering of their decouplings need not be universal. We illustrate this with Standard-Model neutrino decoupling, strong-washout leptogenesis, dark-matter scenarios where kinetic decoupling precedes chemical freeze-out (resonant/forbidden, conversion/coannihilation, coscattering), and dark sectors at with temperatures distinct from the visible-sector temperature, with semi-an…

Expected Constraints on the Intergalactic Magnetic Field using Gamma-Ray Bursts with the Cherenkov Telescope Array Observatory
T\'en\'eman Keita, Renaud Belmont, Thierry Stolarczyk
https://arxiv.org/abs/2509.16092

Expected Constraints on the Intergalactic Magnetic Field using Gamma-Ray Bursts with the Cherenkov Telescope Array Observatory
The InterGalactic Magnetic Field (IGMF), which could permeate the cosmic voids but was never detected so far, is considered a relic of the early Universe. Constraints on its strength $B$ can be derived from its influence on time-delayed very-high-energy photons from Gamma-Ray Bursts (GRBs) in the electromagnetic cascades along their path to the Earth. The present lower limit achieved on its intensity is $10^{-18}\;\mathrm{G}$. In this work, we simulate data from the Cherenkov Telescope Array Ob…

The LOFAR Two-metre Sky Survey Deep Fields: new probabilistic spectroscopic classifications and the accretion rates of radio galaxies
M. I. Arnaudova, D. J. B. Smith, M. J. Hardcastle, P. N. Best, S. Das, S. Shenoy, K. J. Duncan, L. R. Holden, R. Kondapally, L. K. Morabito, H. J. A. Rottgering
https://arxiv.org/abs/2508.18347

The LOFAR Two-metre Sky Survey Deep Fields: new probabilistic spectroscopic classifications and the accretion rates of radio galaxies
The faint radio-source population includes sources dominated both by star formation and active galactic nuclei (AGN), encoding the evolution of activity in the Universe. To investigate its nature, we probabilistically classified 4,471 radio sources at z < 0.947 using low-frequency radio data from the LoTSS Deep Fields alongside a multi-component model for nebular emission, sampled by spectra obtained with the Dark Energy Spectroscopic Instrument (DESI). This was done by combining three tools: (…

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…

Probing the HI distribution at small scales using 21-cm Intensity Mapping at large scales
Minal Chhabra, Somnath Bharadwaj
https://arxiv.org/abs/2508.19126 https://

Probing the HI distribution at small scales using 21-cm Intensity Mapping at large scales
Neutral hydrogen (HI) 21-cm Intensity Mapping (IM) holds the potential to map the large-scale structures in the Universe over a wide redshift range $(z \lesssim 5.5)$, measure cosmological parameters, and shed light on the nature of dark energy. In addition, the signal is also sensitive to how the HI is distributed among the dark matter haloes, this being quantified through the HIHM relation, which relates the HI mass to the halo mass. In this work, we investigate whether measurements of the 21…

Testing the Dark Universe through the Layzer-Irvine Equation
Cl\'audio Gomes
https://arxiv.org/abs/2508.17064 https://arxiv.org/pdf/2508.17064

Testing the Dark Universe through the Layzer-Irvine Equation
We review the cosmic generalisation of the virial theorem known as the Layzer-Irvine equation, also independently derived by Dmitriev and Zeldovich. This equation has been studied in the literature for dark matter-dark energy interaction models, as well as in the context of alternative theories of gravity. We discuss results from the previous scenarios and point out future directions.

The dawn of discs - unveiling the turbulent ionized gas kinematics of the galaxy population at z ∼ 4–6 with JWST/NIRCam grism spectroscopy: #galaxies in the early universe struggled to settle: https://www.cam.ac.uk/research/news/messy-galaxies-in-the-early-universe-struggled-to-settle

The vacuum stability and the hierarchy problem in a fermionic dark matter model
Mojtaba Hosseini
https://arxiv.org/abs/2509.16789 https://arxiv.org/pdf/250…

The vacuum stability and the hierarchy problem in a fermionic dark matter model
We consider an extension to the Standard Model (SM) with four new fields including scalar($S$), spinor($ψ^{1,2}$) and vector($V_μ$) under new $U(1)$ gauge group in the hidden sector. The scalar particle interacts with the SM Higgs particle and is an intermediary between the dark and the SM parts . Our dark matter(DM) candidate is the spinor particle. We show that the model successfully explains the relic density of the DM in the universe and evades the strong bounds from direct detection expe…

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Elizabeth R. Stanway (University of Warwick, UK), Conor M. Byrne (University of Warwick, UK), Ankur Upadhyaya (University of Warwick, UK)
https://arxiv.org/abs/2508.16394

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Stellar population synthesis models are an essential tool with which galaxy physical parameters are extracted from observations. However they are built on assumptions designed for use in the local Universe, and not always appropriate to high redshift galaxies. Here we consider the impact of including the hitherto-neglected stellar pre-main sequence delay timescale on the interpretation of composite stellar populations at ages of <1 Gyr. We find that doing so has an impact on the optical luminos…

Cosmic Multipoles in Galaxy Surveys II: Comparing Different Methods in Assessing the Cosmic Dipole
Vasudev Mittal, Oliver T. Oayda, Geraint F. Lewis
https://arxiv.org/abs/2509.20651

Cosmic Multipoles in Galaxy Surveys II: Comparing Different Methods in Assessing the Cosmic Dipole
We present a comparative analysis of estimators and Bayesian methods for determining the number count dipole from cosmological surveys. The increase in discordance between the number count dipole and the CMB's kinematic dipole has presented a challenge to the assumption of an isotropic and homogeneous universe. The level of discordance has depended on the choice of method to determine the dipole; hence, there is a need to compare them to determine the better approach. We select the healpy fit_d…

Confronting Rainbow-deformed $f(R)$ Gravity with the ACT Data
S. D. Odintsov, V. K. Oikonomou
https://arxiv.org/abs/2508.17358 https://arxiv.org/pdf/2508.1…

Confronting Rainbow-deformed $f(R)$ Gravity with the ACT Data
In this work we examine a theoretical scenario which combines two fundamental theoretical proposals for the early Universe and a possible evolution for the early post-inflationary epoch. Specifically, we assume that the early Universe contains gravity's rainbow effects on the spacetime and the inflationary Lagrangian contains $R^2$ corrections or $f(R)$ gravity corrections in general. In addition we assume that the era beyond the end of inflation until the reheating temperature is reached, is a…

How about some recent, well, pretty unusual #astronomy papers? Like https://arxiv.org/abs/2507.02162 = Dangerous Questions in Astronomy Education or https://arxiv.org/abs/2508.19984 = Communicating astrobiology and the search for life elsewhere: speculations and promises of a developing scientific field in newspapers, press releases and papers ... or https://arxiv.org/abs/2508.04718 = Quantum panprotopsychism and a consciousness-centered universe

X-rays from Inelastic Dark Matter Freeze-in
Gordan Krnjaic, David McKeen, Riku Mizuta, Gopolang Mohlabeng, David E. Morrissey, Douglas Tuckler
https://arxiv.org/abs/2509.19428 h…

X-rays from Inelastic Dark Matter Freeze-in
We study inelastic dark matter produced via freeze-in through a light mediator with a mass splitting below the electron-positron threshold. In this regime, the heavier dark matter state is naturally long-lived compared to the age of the Universe and decays to the lighter state in association with photons. Given a light mediator, the dark matter abundance is directly related to the decay rate of the heavier dark matter. We show that observations of photons from the galactic center can effectivel…

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…

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…

Effort.jl - a fast and differentiable emulator for the Effective Field Theory of the Large Scale Structure of the Universe: #Universe, faster and with the same accuracy: https://www.eurekalert.org/news-releases/1097832 - a new JCAP study tests an “emulator” to reconstruct the large-scale structure of the cosmos.

Exact Solutions for a Teleparallel Cosmological Model with Vector Field via Noether Symmetry
Yusuf Kucukakca, Fereshteh Omidvar, Amin Rezaei Akbarieh
https://arxiv.org/abs/2508.17795

Exact Solutions for a Teleparallel Cosmological Model with Vector Field via Noether Symmetry
We study a cosmological model in the framework of teleparallel gravity, where a vector field $A_μ$ is non-minimally coupled to the torsion scalar $T$ in a flat Friedmann-Robertson-Walker (FRW) universe. Using the Noether symmetry approach, we identify specific forms for the coupling function $g(ξ)$ and the potential $V(ξ) = V_0 ξ^n$, with $ξ\equiv A_μA^μ$. The method allows us to find exact analytical solutions for the scale factor $a(t)$ and the scalar function $ξ(t)$. General solution…

Constraining Multi-scalars models with colliders and Dark Matter
Rafael Boto
https://arxiv.org/abs/2509.19004 https://arxiv.org/pdf/2509.19004

Cosmic inventory of the background fields of relativistic particles in the Universe
Jonathan Biteau
https://arxiv.org/abs/2509.17954 https://arxiv.org/pdf/…

Cosmic inventory of the background fields of relativistic particles in the Universe
The extragalactic background is composed of the emission from all astrophysical sources, both resolved and unresolved, in addition to any diffuse components. In the last decade, there has been significant progress in our understanding of the cosmic history of extragalactic emissions associated with stellar evolution and accretion onto supermassive black holes, largely enabled by the extensive body of multi-wavelength data. The brightness of the extragalactic sky is now measured in photons, neut…

Algebraic and Positive Geometry of the Universe - from Particles to Galaxies: #Universe — Revealed Through Algebraic Geometry: https://www.mis.mpg.de/news/press-releases/the-shape-of-the-universe-revealed-through-algebraic-geometry

Cosmological viability of anisotropic inflation in Thurston spacetimes
Devika J. S., Tanay Gupta, Sukanta Panda
https://arxiv.org/abs/2509.16553 https://ar…

Cosmological viability of anisotropic inflation in Thurston spacetimes
The introduction of anisotropy into large scale geometry of the universe has led to the development of Thurston spacetimes possessing an inherent anisotropic curvature in them. Studies related to these anisotropic spacetimes have revealed how they could explain the evolutionary dynamics and light propagation in the universe. Here, we consider these spacetimes under the inflationary epoch to examine whether we could address the possibility of anisotropic inflation in the universe. Researches hav…

On-sky Demonstration of #Subdiffraction-limited Astronomical Measurement Using a #PhotonicLantern: #Telescope hack opens a sharper view into the universe: https://newsroom.ucla.edu/releases/telescope-hack-peers-deeper-into-universe - it is the first time the novel imaging technique has been used on telescopes.

The phenomenology of Quantum Bounce in the Klein-Gordon, Wheeler-DeWitt and Dirac formalisms
Eleonora Giovannetti
https://arxiv.org/abs/2508.14149 https://…

The phenomenology of Quantum Bounce in the Klein-Gordon, Wheeler-DeWitt and Dirac formalisms
We investigate the different meanings that the concept of Quantum Bounce acquires in various formalisms. The original idea refers to the phenomenology that appears in the Klein-Gordon framework when homogeneous cosmologies are considered. In that case, the Quantum Bounce describes the quantum scattering between a collapsing and an expanding Universe branch, and therefore provides a quantum description of the semiclassical Big Bounce mechanism. Here, we show that the proposal of the Quantum Big …

From kinetic gasses to an exponentially expanding universe: #universe: https://www.zarm.uni-bremen.de/en/news-list/news-display/new-attempt-to-explain-the-accelerated-expansion-of-the-universe

Resistive Scaling in the Magnetic Helicity-Driven Inverse Cascade
Jiyao Zhang, Axel Brandenburg
https://arxiv.org/abs/2509.21141 https://arxiv.org/pdf/2509…

Resistive Scaling in the Magnetic Helicity-Driven Inverse Cascade
The inverse cascade in MHD turbulence plays a crucial role in various astrophysical processes such as galaxy cluster formation, solar and stellar dynamo mechanisms, and the evolution of primordial magnetic fields in the early universe. A standard numerical approach involves injecting magnetic helicity at intermediate length scales to generate a secondary, time-dependent spectral peak that gradually propagates toward larger scales. Previous simulations have already suggested a resistive dependen…

Cyclic Kruskal Universe: a quantum-corrected Schwarzschild black hole in unitary unimodular gravity
Steffen Gielen, Sofie Ried
https://arxiv.org/abs/2509.18273 https://