Tootfinder

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…

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

Catte Cinematic Universe

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.

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…

Mid-Infrared diagnostics for identifying main sequence galaxies in the local Universe
C. Daoutis, A. Zezas, M. L. N. Ashby
https://arxiv.org/abs/2509.16964 https://

Mid-Infrared diagnostics for identifying main sequence galaxies in the local Universe
A galaxy's mid-IR spectrum encodes key information on its radiation field, star formation, and dust properties. Characterizing this spectrum therefore offers strong constraints on a galaxy's activity. This project describes a diagnostic tool for identifying main-sequence (MS) star-forming galaxies (SFGs) in the local Universe using IR dust emission features that are characteristic of galaxy activity. A physically-motivated sample of mock galaxy spectra has been generated to simulate the IR emis…

Multifield Cosmology and the Dark Universe
Lilia Anguelova
https://arxiv.org/abs/2509.17179 https://arxiv.org/pdf/2509.17179…

Multifield Cosmology and the Dark Universe
Multifield models, arising from multiple scalars interacting with gravity, provide a rich theoretical framework for addressing fundamental problems in modern cosmology. A key role in this regard is played by the so called rapid turn regime, which is characterized by background solutions with strongly non-geodesic field-space trajectories. We review the implications of this regime for a number of problems relevant for cosmological inflation, dark matter and dark energy. We focus, in more detail,…

It’s a pattern.
Nov 14, aboard Air Force One, Trump told Bloomberg reporter Catherine Lucey, “Quiet. Quiet, piggy.”
It’s not new. He called Miss Universe Alicia Machado “Miss Piggy” and “Miss Housekeeping.”
He’s called women “fat pigs,” “dogs,” “slobs,” and “disgusting animals.”
This from 2016…
https://

Christopher Webb (@cwebbonline.com)
It’s a pattern. Nov 14, aboard Air Force One, Trump told Bloomberg reporter Catherine Lucey, “Quiet. Quiet, piggy.” It’s not new. He called Miss Universe Alicia Machado “Miss Piggy” and “Miss Housekeeping.” He’s called women “fat pigs,” “dogs,” “slobs,” and “disgusting animals.” This from 2016…

Ever so fitting for our trying times, and a growing conflict for quite a few people (incl. myself), I imagine...
"Absurdism is the philosophical theory that the universe is irrational and meaningless. It states that trying to find meaning leads people into conflict with a seemingly meaningless world. This conflict can be between rational humanity and an irrational universe, between intention and outcome, or between subjective assessment and objective worth..."

Absurdism - Wikipedia

I hereby use my powers as prospective emperor of the universe (pro tem) to imbue a new white house ball room with an official name:
The Jeffry Epstein Memorial Bunga Bunga Ball(ing) Room.
Or the JEMBBBR.

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…

Analytic derivation of GW spectrum from bubble collisions in FLRW Universe
Masaki Yamada
https://arxiv.org/abs/2509.16073 https://arxiv.org/pdf/2509.16073

Analytic derivation of GW spectrum from bubble collisions in FLRW Universe
We generalize the analytic formula for the gravitational-wave spectrum from bubble collisions during a cosmological first-order phase transition, under the thin-wall and envelope approximations, by incorporating the effect of cosmic expansion in the FLRW metric. Along with presenting the complete analytic expression and corresponding numerical results, we also derive simplified formulas valid in the large- and small-$k$ limits, as well as in the flat-spacetime limit. The latter expansion reveal…

While most races in the #StarTrek universe have a homeplanet, there are a few nomadic species as well. And one is the subject of today's #TrekTriviaTuesday question.
As always no googling and no spoiling the answer for others. Please boost after voting! :BoostOK:
Vote will run …

Series B, Episode 02 - Shadow
BEK: So it was an alien life form that killed her?
CALLY: Yes. It was trying to use Orac as a bridge to cross from it's own universe into ours.
JENNA: That's why it needed so much power.
https://blake.torpidity.net/m/202/598 B7B4

🇺🇦 #NowPlaying on KEXP's #VarietyMix
Universe People:
🎵 Bus Route
#UniversePeople
https://universepeople-bonjour.bandcamp.com/track/bus-route
https://open.spotify.com/track/5ykmUt1konA76PVgg58SC7

A metal free galaxy doesn't sound like somewhere I'd wanna live. Glad our galaxy has lots of metal in it
https://www.sciencealert.com/strange-metal-free-galaxy-may-hide-the-universes-first-stars

Strange 'Metal-Free' Galaxy May Hide The Universe's First Stars
Over the course of billions of years, the Universe has steadily been evolving.

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…

Universe help us if someone invokes his name and claims a miracle occured...
Charlie Kirk Memorial Service Begins; Trump, JD Vance To Speak
https://deadline.com/2025/09/charlie-kirk-memorial-service-1236551834/

Thought: Philosophical arguments are like financial leverage. With them, you can bet on modest-seeming intuitive principles and come out with grand statements about the nature of the universe. But if your principles are even slightly wrong, your conclusions will be extremely wrong.

I am so sick of the universe being so fucking cruel to people I care about in ways I can't do anything about

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…

"Math Suggests We May Be the Only Intelligent Life in the Universe"
Meanwhile on Earth: cats ringing doorbells, chimps wearing leaf masks to conceal their identities while doing crime 😄 So much win for a pale blue dot 🥰

the president of columbia is currently giving relationship advice on x dot com

Search for cosmic-ray induced gamma-ray emission from local galaxy clusters using Fermi-LAT data
Judit P\'erez-Romero, Mattia di Mauro, R\'emi Adam, Miguel \'A. S\'anchez-Conde, Gabrijela Zaharijas
https://arxiv.org/abs/2509.15720

Search for cosmic-ray induced gamma-ray emission from local galaxy clusters using Fermi-LAT data
Galaxy clusters are the most massive gravitationally bound structures in the Universe. Even if clusters are nearly virialized structures, they undergo merging processes, creating merging shocks, and suffer from feedback from galaxies and Active Galactic Nuclei; causing complex turbulent motions and amplifying their magnetic fields. These processes act as acceleration mechanisms for the plasma of the intracluster medium (ICM), originating a population of cosmic rays (CRs). Leptonic CRs have long…

Deep Reinforcement Learning in Factor Investment
Junlin Liu
https://arxiv.org/abs/2509.16206 https://arxiv.org/pdf/2509.16206

Deep Reinforcement Learning in Factor Investment
Deep reinforcement learning has shown promise in trade execution, yet its use in low-frequency factor portfolio construction remains under-explored. A key obstacle is the high-dimensional, unbalanced state space created by stocks that enter and exit the investable universe. We introduce Conditional Auto-encoded Factor-based Portfolio Optimisation (CAFPO), which compresses stock-level returns into a small set of latent factors conditioned on 94 firm-specific characteristics. The factors feed a D…

A triumph of film art, creating on the screen a vast, awe-inspiring picture of the universe as it would appear to a voyager through space, this film was among the sources used by Stanley Kubrick in his 2001: A Space Odyssey.
Universe - #NFB
https://www.nfb.ca/film/universe/

Axions as Dark Matter, Dark Energy, and Dark Radiation
Luca Visinelli
https://arxiv.org/abs/2509.17059 https://arxiv.org/pdf/2509.17059

Axions as Dark Matter, Dark Energy, and Dark Radiation
Axions and axion-like particles are ubiquitous in extensions of the Standard Model and offer a unifying perspective on open problems in cosmology. Depending on their mass and interactions, axions can act as dark matter, drive cosmic acceleration as dark energy, or contribute to the relativistic background as dark radiation. Motivated by the plenary talk at TAUP 2025, this proceeding reviews the phenomenology of light bosons in the early and late Universe, with a focus on the theoretical foundat…

REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe
Hiddo Algera, Lucie Rowland, Renske Smit, Rebecca Fisher, Lise Ramambason, Nimisha Kumari, Livia Vallini, Hanae Inami, Themiya Nanayakkara, Mauro Stefanon, Manuel Aravena, Tom Bakx, Rychard Bouwens, Rebecca Bowler, Karin Cescon, Chian-Chou Chen, Pratika Dayal, Ilse De Looze, Andrea Ferrara, Yoshinobu Fudamoto, Lena Komarova, Ivana van Leeuwen, Katherine Ormerod, Sander Schouws, Laura Sommovigo, Aswin Vi…

REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe
We present new ALMA [OIII]$_{88}$ observations of eight previously [CII]$_{158}$-detected galaxies at $6.8 \lesssim z \lesssim 7.7$. Six of our targets -- the primary sample -- are massive, UV-luminous galaxies drawn from the REBELS survey, while the remaining two are UV-fainter galaxies that were previously serendipitously detected through their luminous [CII] lines in the REBELS fields. We detect [OIII]$_{88}$ emission in all eight galaxies at $6.2 - 17.7σ$ significance, and find them to be …

https://www.space.com/astronomy/dark-universe/dark-matter-obeys-gravity-after-all-could-that-rule-out-a-5th-fundamental-force-in-the-universe

Towards a Robust Machine-Learning Pipeline for 21-cm Cosmology Data Analysis I: A Roadmap for Development and Demonstration of Robustness Against PSF Modeling Errors
Madhurima Choudhury, Jonathan C. Pober
https://arxiv.org/abs/2509.16280

Towards a Robust Machine-Learning Pipeline for 21-cm Cosmology Data Analysis I: A Roadmap for Development and Demonstration of Robustness Against PSF Modeling Errors
The 21-cm signal from the Epoch of Reionization (EoR) is a powerful probe of the evolution of the Universe. However, accurate measurements of the EoR signal from radio interferometric observations are sensitive to efficient foreground removal, mitigating radio-frequency interference and accounting for instrumental systematics. This work represents the first in a series of papers, where we will be introducing a novel ML based pipeline, step-by-step, to directly infer reionization parameters from…

I don't think there's enough coffee in the universe. We need more!

heise | Github Universe 2025: Wie Github sich erneut beweisen will
Github setzt auf Copiloten und KI-Agenten – und rückt näher an Microsoft. In welche Zukunft steuert die selbst ernannte "Heimat für Softwareentwickler"?

🇺🇦 #NowPlaying on #BBC6Music's #LaurenLaverne
Khruangbin:
🎵 Time (You And I)
#Khruangbin
https://khruangbin.bandcamp.com/album/the-universe-smiles-upon-you
https://open.spotify.com/track/0S3BtG3i5tkQmehJhIhHF3

The Flagship galaxy mock catalogue - a comprehensive simulation for the #Euclid mission: https://www.aanda.org/articles/aa/full_html/2025/05/aa50853-24/aa50853-24.html -> A virtual Universe for Euclid: https://www.euclid-ec.org/public/press-releases/euclid-flagship-simulations/ - the largest cosmological simulations catalogue is now public.

🇺🇦 #NowPlaying on KEXP's #MorningShow
The Chemical Brothers:
🎵 The Universe Sent Me
#TheChemicalBrothers
https://maryag.bandcamp.com/track/the-chemical-brothers-the-universe-sent-me-maryag-remix
https://open.spotify.com/track/4u0fYkrfpqcFjsGVEk4ewM

🍇 The universe's secret harvest: Shedding light on 'the cosmic grapes'
#astronomy

The universe's secret harvest: Shedding light on 'the cosmic grapes'
Astronomers have discovered a remarkably clumpy rotating galaxy that existed just 900 million years after the Big Bang, shedding new light on how galaxies grew and evolved in the early universe. Nicknamed the "Cosmic Grapes," the galaxy appears to be composed of at least 15 massive star-forming clumps—far more than current theoretical models predict could exist within a single rotating disk at this early time.

Gravitational baryogenesis in $f(T,L_m)$ gravity
Daniel F. P. Cruz, David S. Pereira, Francisco S. N. Lobo
https://arxiv.org/abs/2509.17218 https://arxiv.o…

Gravitational baryogenesis in $f(T,L_m)$ gravity
The observed matter-antimatter asymmetry of the Universe remains a fundamental challenge in modern physics. In this work, we explore gravitational baryogenesis within the framework of $f(T,L_m)$ gravity, where the gravitational Lagrangian depends on both the torsion scalar $T$ and the matter Lagrangian $L_m$. We consider three representative models and examine their ability to generate the observed baryon-to-entropy ratio. Our analysis shows that couplings involving both torsion and the matter …

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…

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 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…

this is my favorite thing I've ever overheard of all time btw

Doctor Rashomon and the UNIVERSE of Madness: Variable Importance with Unobserved Confounding and the Rashomon Effect
Jon Donnelly, Srikar Katta, Emanuele Borgonovo, Cynthia Rudin
https://arxiv.org/abs/2510.12734

Doctor Rashomon and the UNIVERSE of Madness: Variable Importance with Unobserved Confounding and the Rashomon Effect
Variable importance (VI) methods are often used for hypothesis generation, feature selection, and scientific validation. In the standard VI pipeline, an analyst estimates VI for a single predictive model with only the observed features. However, the importance of a feature depends heavily on which other variables are included in the model, and essential variables are often omitted from observational datasets. Moreover, the VI estimated for one model is often not the same as the VI estimated for…

Invisible Languages of the LLM Universe
Saurabh Khanna, Xinxu Li
https://arxiv.org/abs/2510.11557 https://arxiv.org/pdf/2510.11557

Invisible Languages of the LLM Universe
Large Language Models are trained on massive multilingual corpora, yet this abundance masks a profound crisis: of the world's 7,613 living languages, approximately 2,000 languages with millions of speakers remain effectively invisible in digital ecosystems. We propose a critical framework connecting empirical measurements of language vitality (real world demographic strength) and digitality (online presence) with postcolonial theory and epistemic injustice to explain why linguistic inequality i…

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

A profile of Josh Wallace Kerrigan, also known as Neural Viz, an independent creator using Midjourney, Runway, and other AI tools to create a cinematic universe (Christopher Beam/Wired)
https://www.wired.com/story/the-future-of-ai-media-parody-of-t…

The Future of AI Isn't Just Slop
Behold Neural Viz, the first great cinematic universe of the AI era. It's from a guy named Josh.

RE: https://mastodon.social/@Wraithe/115567755795916134
Oh so it’s SEDATION sedation, aka knocking your ass (sorry) out.
So that’ll be a new experience.
Here’s hoping I wake up in a better universe. See ya, suckers!

CosmoGen: a cosmological model generator
D. Castel\~ao, I. Tereno
https://arxiv.org/abs/2509.15453 https://arxiv.org/pdf/2509.15453

CosmoGen: a cosmological model generator
The standard $Λ$CDM paradigm of the physical Universe suffers from well-known conceptual problems and is challenged by observational data. Alternative models exist in the literature, both phenomenological and physically motivated, many of them suffering from similar or new problems. We propose a method to mechanically generate alternative models in a procedure informed by data and tuned to mitigate specific problems. We implement a computational framework, dubbed CosmoGen, that integrates evol…

In an alternative universe, Sharkey is the biggest fedi service and toots are called noms

"The tech platforms that promised to transform our attention spans succeeded, but only superficially. They created a new, much worse way of creating culture. A universe of dumbasses talking to other dumbasses, measured by numbers that don’t make sense and don’t reflect anything other than passive screen time."
(Original title: The Great Dumbening)

The Great Dumbening
Read to the end for it’s Tronin’ time

Is the $\Lambda$CDM Model in Crisis?
Himanshu Chaudhary, Salvatore Capozziello, Subhrat Praharaj, Shibesh Kumar Jas Pacif, G. Mustafa
https://arxiv.org/abs/2509.17124 https://…

Is the $Λ$CDM Model in Crisis?
We present strong evidence for dynamical dark energy challenging the $Λ$CDM model. Several dark energy models are explored, including $ω_0ω_a$CDM, logarithmic, Exponential, JBP, and BA, along with non-flat cosmologies accounting for potential spatial curvature. Our analysis supports a flat Universe ($Ω_k \approx 0$). Using the Metropolis-Hastings MCMC algorithm, we analyze data from BAO of DESI DR2, Type Ia Supernovae, and CMB to constrain model parameters. We find strong evidence that $ω\…

Ultra-high-energy neutrino detection with radio antennas in the ground-based observatory
Baobiao Yue, Karl-Heinz Kampert, Julian Rautenberg
https://arxiv.org/abs/2509.17575 http…

Ultra-high-energy neutrino detection with radio antennas in the ground-based observatory
Ultra-high-energy (UHE) neutrinos are unique cosmic messengers that can traverse cosmological distances unattenuated, offering direct insight into the most energetic processes in the universe. Radio detection promises significant advantages for detecting highly inclined air showers induced by UHE neutrinos, including a larger exposure range compared to particle detectors, which is due to minimal atmospheric attenuation of radio signals combined with good reconstruction precision. Furthermore, t…

A profile of Josh Wallace Kerrigan, also known as Neural Viz, a filmmaker using AI tools from Midjourney to Runway to create a cinematic universe (Christopher Beam/Wired)
https://www.wired.com/story/the-future-of-ai-media-parody-of-the-apocalypse-g…

The Future of AI Isn't Just Slop
Behold Neural Viz, the first great cinematic universe of the AI era. It's from a guy named Josh.

🇺🇦 #NowPlaying on KEXP's #SundaySoul
Universe City:
🎵 Can You Get Down
#UniverseCity
https://universecitymusic.bandcamp.com/album/can-you-get-down-serious-2021-remaster
https://open.spotify.com/track/7ApnZM8mCOrdn1isKpcCVQ

On Geometric Structures in the Einstein Universe for $\mathrm{SO}_0(p,p 1)$-Hitchin Representations
Colin Davalo, Parker Evans
https://arxiv.org/abs/2510.12779 https://

On Geometric Structures in the Einstein Universe for $\mathrm{SO}_0(p,p+1)$-Hitchin Representations
Let $S$ be a closed surface of genus $g \geq 2$. We determine the topology of the fibers of the domain of discontinuity in $\mathrm{Ein}^{p-1,p}$ defined by Guichard-Wienhard and Kapovich-Leeb-Porti for $\mathrm{SO}_0(p,p+1)$-Hitchin representations for $p \geq 3$.

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

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

https://www.universetoday.com/articles/the-early-universe-helps-black-holes-grow-big-but-not-in-the-long-run

Exordia (2024) by Seth Dickinson is a fun romp on trolley problems if your idea of fun includes "nuke Kurdistan or else we nuke the world". Obama is president, and an alien appears in Central Park to drag some broken people into a battle over an artifact that can change the universe. These aliens have actual Original Sin, and visibly so. Humans freak out at the alien wrongness, a metaphysical brand that shows the entire alien race is doomed from birth to go to a literal hell when t…

The Most Important Device in the Universe - Blinking Tubes Without Function New Compilation (Part 1)
https://www.youtube.com/watch?v=phPp5oYnps0

Cosmographic Footprints of Dynamical Dark Energy
Elisa Fazzari, William Giar\`e, Eleonora Di Valentino
https://arxiv.org/abs/2509.16196 https://arxiv.org/p…

Cosmographic Footprints of Dynamical Dark Energy
We introduce a novel cosmographic framework to trace the late-time kinematics of the Universe without assuming any underlying dynamics. The method relies on generalized Padé-$(2,1)$ expansions around arbitrary pivot redshifts, which, compared to state-of-the-art calculations, reduce truncation errors by up to two orders of magnitude at high redshift and yield more precise constraints by defining cosmographic parameters exactly where the data lie. This avoids extrapolations, mitigates degenerac…

Enhanced Gravitational Effects of Radiation and Cosmological Implications
Hemza Azri, Kemal G\"ultekin, Adrian K. E. Tee
https://arxiv.org/abs/2509.17384 https://

Enhanced Gravitational Effects of Radiation and Cosmological Implications
In the momentarily comoving frame of a cosmological fluid, the determinant of the energy-momentum tensor (EMT) is highly sensitive to its pressure. This component is significant during radiation-dominated epochs, and becomes naturally negligible as the universe transitions to the matter-dominated era. Here, we investigate the cosmological consequences of gravity sourced by the determinant of the EMT. Unlike Azri and Nasri, Phys. Lett. B 836, 137626 (2023), we consider the most general case in w…

Crosslisted article(s) found for astro-ph.HE. https://arxiv.org/list/astro-ph.HE/new
[2/2]:
- Cosmic inventory of the background fields of relativistic particles in the Universe
Jonathan Biteau

Quintessential inflation studied through Semiclassical Methods
Jordan Zambrano, Miguel Agama, Marcos Garz\'on, Werner Bramer-Escamilla, Clara Rojas, Te\'ofilo Vargas
https://arxiv.org/abs/2509.15360

Quintessential inflation studied through Semiclassical Methods
In this work, we solved the scalar and tensor perturbation equations numerically and using the improved uniform approximation method together with the third-order phase-integral method, for the $α$-attractor inflationary model. This inflationary model has become very important because it allows us to describe the initial accelerated expansion of the universe in the inflationary epoch, and the current accelerated expansion with the same potential that depends on one scalar field $φ$. Once the …

what if i could bend the moral arc of the universe and choo,se not to

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.

Higgs Field as Architect of a Geodesically Complete Universe and Agent for New Physics in Interiors of Black Holes
Itzhak Bars
https://arxiv.org/abs/2509.07346 https://

Higgs Field as Architect of a Geodesically Complete Universe and Agent for New Physics in Interiors of Black Holes
The Higgs boson is often compared to a small ripple on a vast, calm ocean. This "ocean" is the universal Higgs vacuum expectation value, about 246 GeV, permeating all space and generating particle masses. Its remarkable uniformity reflects the large-scale nature of the universe. Here I argue that the Higgs field plays a far deeper role. In regions of extreme gravity near singularities, it becomes a non-perturbative, space-time--dependent field that creates new space-time domains beyond gravitat…

Classical and quantum aspects of perturbations in Primordial Universe
Alice Boldrin
https://arxiv.org/abs/2509.13080 https://arxiv.org/pdf/2509.13080

Classical and quantum aspects of perturbations in Primordial Universe
In this work, our aim is to obtain a Hamiltonian formulation suitable for canonical quantization. Moreover, we assume that the early Universe can be described with fewer initial symmetries, thus we abandon the isotropy assumption and instead explore anisotropic universes, beginning with the simplest one, namely Bianchi I (BI). The presence of small initial fluctuations in the early universe can be well described by perturbations around a homogeneous background. GR is a constrained system, and w…

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

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…

Deep Extragalactic VIsible Legacy Survey (DEVILS): Galaxy group catalogue for the D10-COSMOS field with 90% spectroscopic redshift completeness
Mat\'ias Bravo, Luke J. M. Davies, Aaron S. G. Robotham, Claudia del P. Lagos, Sabine Bellstedt, Joss Bland-Hawthorn, Malgorzata Siudek, Trystan S. Lambert, Chris Power
https://arxiv.org/abs/25…

Deep Extragalactic VIsible Legacy Survey (DEVILS): Galaxy group catalogue for the D10-COSMOS field with 90% spectroscopic redshift completeness
Large-scale galaxy redshift surveys conducted over the last couple of decades have proven crucial in deepening our understanding of structure growth in the Universe and galaxy evolution. While there have been several such surveys, until now those that achieve the high completeness and precision necessary to probe the low-mass end of galaxy groups have been limited to relatively low redshifts ($z\lesssim0.3$), with surveys exploring the more distant Universe being constrained by small sample siz…

Encyclopedia of Astrophysics: The Expanding Universe
Tamara M. Davis
https://arxiv.org/abs/2509.09954 https://arxiv.org/pdf/2509.09954

Encyclopedia of Astrophysics: The Expanding Universe
The expansion of the Universe is the basis of modern cosmology. This chapter outlines the theory behind the expansion of the universe, including the cosmological principle, distances, velocities, and accelerations. We provide basic derivations of the key equations and highlight some interesting features, such as superluminal expansion, how pressure increases gravitational attraction, the subtleties of conservation of energy in the expanding universe, and the existence of cosmological horizons.

A Metal-free Galaxy at z = 3.19? Evidence of Late Population III Star Formation at #CosmicNoon: https://iopscience.iop.org/article/10.3847/2041-8213/ae1608 -> A “Living Fossil” of the Very Early Universe? Discovery of a First-Generation Galaxy at Cosmic Noon: https://astro.tsinghua.edu.cn/en/info/1026/2762.htm

A no-go theorem for large $N$ closed universes
Elliott Gesteau
https://arxiv.org/abs/2509.14338 https://arxiv.org/pdf/2509.14338

A no-go theorem for large $N$ closed universes
Under conservative assumptions, it is established at a mathematical level of rigor that if correlation functions of single trace operators in a sequence of states of $O(N^0)$ energy of a two-sided holographic conformal field theory admit a large $N$ limit, then they must be described a pure state in the large $N$ Hilbert space of free field theory on two copies of vacuum AdS. This result clarifies recent discussions concerning the possible emergence of a semiclassical baby universe in the large…

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…

Deep imaging of the #galaxy Malin 2 shows new faint structures and a candidate satellite dwarf galaxy: https://www.aanda.org/articles/aa/abs/2025/10/aa56569-25/aa56569-25.html -> IAC research reveals hidden structures and a turbulent past in one of the largest spiral galaxies in the Universe: https://www.iac.es/en/outreach/news/iac-research-reveals-hidden-structures-and-turbulent-past-one-largest-spiral-galaxies-universe

Lepton Collider as a Window to Reheating via Freezing Out Dark Matter Detection
Subhaditya Bhattacharya, Anupam Ghosh, Niloy Mondal, Abhik Sarkar
https://arxiv.org/abs/2509.14340

Lepton Collider as a Window to Reheating via Freezing Out Dark Matter Detection
We investigate a particle dark matter (DM) scenario where the DM interaction with the Standard Model are mediated by a leptophilic effective operator. Unlike conventional WIMP scenarios where thermal freeze-out occurs in a radiation-dominated Universe, we consider DM freeze-out during a prolonged reheating epoch driven by inflaton decay. The resulting departure from standard cosmology alters the thermal evolution of the dark matter abundance, making it sensitive to the reheating temperature and…

Cyclic universe and uniform rate inflation in loop quantum cosmology
Bikash Chandra Paul, Sahil Saini
https://arxiv.org/abs/2510.11230 https://arxiv.org/pd…

Cyclic universe and uniform rate inflation in loop quantum cosmology
We investigate uniform rate inflationary universe in the framework of Loop quantum cosmology. The potential for uniform rate inflation in a loop quantized FRW spacetime turns out to be a polymerized version of the corresponding potential in general relativity, which mimics the potentials for a polymerized scalar field and that for hybrid natural inflation (HNI). The potential leads to a cyclic universe with identical epochs separated by quantum bounces which replace the classical singularity. T…

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…

Gravitational Recoil and Suppression of Super Massive Black Hole Seeds in the Early Universe
Bisweswar Sen
https://arxiv.org/abs/2509.10564 https://arxiv.o…

Gravitational Recoil and Suppression of Super Massive Black Hole Seeds in the Early Universe
We investigate the impact of gravitational-wave (GW) recoil on the growth of supermassive black holes (SMBHs) in the early Universe. Forming ~10^9 Msun SMBHs by z ~ 6 is challenging and may require hierarchical mergers of smaller seed black holes. We extend a semi-analytic seed model (Sassano et al. 2021) by explicitly incorporating GW recoil physics. Our model includes: (1) recoil velocity formulae calibrated to numerical relativity for spinning, unequal-mass BH binaries (Campanelli et al. 200…

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…

DBI scalar field cosmology in $n$-DBI gravity
Nahomi Kan, Kiyoshi Shiraishi, Maki Takeuchi, Mai Yashiki
https://arxiv.org/abs/2509.11669 https://arxiv.org/…

DBI scalar field cosmology in $n$-DBI gravity
We study inflationary characterictics of the universe in $n$-DBI gravity, driven by DBI-deformed scalar fields. In this paper, we consider the evolution of the classical universe for a scalar potential whose equations of motion are expressed by a BPS-like system of first-order differential equations.The advantage of a BPS-like system is that it allows the initial condition for the wave function of the Universe in minisuperspace quantum cosmology to be automatically determined by the Hamiltonian…

A warm ultraluminous infrared #galaxy just 600 million years after the big bang: https://academic.oup.com/mnras/article/544/2/1502/8318242?login=false -> Superheated star factory is discovered in early universe: https://ras.ac.uk/news-and-press/research-highlights/superheated-star-factory-discovered-early-universe

Extreme properties of a compact and massive accreting black hole host in the first 500 Myr: #BlackHole in the early Universe: https://esawebb.org/news/weic2522/

Emergence of Entropic Time in a Tabletop Wheeler-DeWitt Universe
Giovanni Barontini
https://arxiv.org/abs/2509.07745 https://arxiv.org/pdf/2509.07745

Emergence of Entropic Time in a Tabletop Wheeler-DeWitt Universe
We implement an analogue Wheeler-DeWitt mini-universe constituted by a well-isolated atomic Bose-Einstein condensate in a time-independent conservative potential. In exact analogy with the Wheeler-DeWitt framework for the actual universe, our system has the fundamental problem of defining from within a meaningful time variable over which to order the events. Here, we partition the mini-universe into a bright and a dark sector, enabling entropy exchange between them through a potential barrier. …

Primordial Black Hole Formation in a Scalar Field Dominated Universe: Investigation of the Critical nature of the Collapse
Luis E. Padilla, Ethan Milligan, David J. Mulryne, Juan Carlos Hidalgo
https://arxiv.org/abs/2509.10431

Primordial Black Hole Formation in a Scalar Field Dominated Universe: Investigation of the Critical nature of the Collapse
In this paper, we investigate the critical collapse leading to primordial black hole (PBH) formation in a universe dominated by a self-interacting scalar field with a quartic potential, comparing it to the well-known radiation-dominated case. Using fully relativistic nonlinear numerical simulations in spherical symmetry, based on the Misner--Sharp formalism, we analyze the dynamics near the collapse threshold and track the scaling of the black hole mass. Our results confirm that both the scalar…

Large-scale peculiar velocities in the #universe: https://arxiv.org/abs/2510.05340 (207 pages!) -> "The observed large-scale peculiar-velocity fields are believed to have originated as weak peculiar-velocity perturbations soon after equipartition, which have subsequently grown by structure formation and by the increasing inhomogeneity of the post-recombination universe. However, the evolution and the implications of these bulk velocity fields remain poorly understood and they are still a matter of debate."

Gravitational collapse with torsion and universe in a black hole
Nikodem Pop{\l}awski
https://arxiv.org/abs/2509.11468 https://arxiv.org/pdf/2509.11468

Gravitational collapse with torsion and universe in a black hole
We consider gravitational collapse of a fluid sphere with torsion generated by spin, which forms a black hole. We use the Tolman metric and the Einstein$-$Cartan field equations with a relativistic spin fluid as a source. We show that gravitational repulsion of torsion prevents a singularity, replacing it with a nonsingular bounce. Quantum particle creation during contraction prevents shear from overcoming torsion. Particle creation during expansion can generate a finite period of inflation and…

Anchoring the Universe with Characteristic Redshifts using Raychaudhuri Equation Informed Reconstruction Algorithm (REIRA)
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
https://arxiv.org/abs/2510.09602

Anchoring the Universe with Characteristic Redshifts using Raychaudhuri Equation Informed Reconstruction Algorithm (REIRA)
We study the robustness and physical implications of a set of characteristic redshifts that capture key features of the late-time Universe. Using both model-independent reconstructions as well as different dark energy (DE) parameterizations, we show that these redshifts remain stable across cosmological models and reconstruction algorithm, making them reliable geometric anchors of the expansion history. Moreover, the Alcock-Paczyński corrections at these redshift anchors are found to be unity …

Is GW190521 a gravitational wave echo of wormhole remnant from another universe?
Qi Lai, Qing-Yu Lan, Hao-Yang Liu, Yu-Tong Wang, Yun-Song Piao
https://arxiv.org/abs/2509.07831 …

Is GW190521 a gravitational wave echo of wormhole remnant from another universe?
A particularly compelling aspect of the GW190521 event detected by the LIGO-Virgo collaboration is that it has an extremely short duration, and lacks a clearly identifiable inspiral phase usually observed in the binary black holes (BBHs) coalescence. In this work, we hypothesize that GW190521 might represent a single, isolated gravitational wave (GW) echo pulse from the wormhole, which is the postmerger remnant of BBHs in another universe and connected to our universe through a throat. The ring…

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.

Large-scale peculiar velocities in the universe
Christos G. Tsagas, Leandros Perivolaropoulos, Kerkyra Asvesta
https://arxiv.org/abs/2510.05340 https://arx…

Large-scale peculiar velocities in the universe
Observations have repeatedly confirmed the presence of large-scale peculiar motions in the universe, commonly referred to as ``bulk flows''. These are vast regions of the observable universe, typically spanning scales of several hundred Mpc, that move coherently with speeds of the order of several hundred km/sec. While there is a general consensus on the direction of these motions, discrepancies persist in their reported sizes and velocities, with some of them exceeding the predictions of the s…

Gravitational lensing by Lema\^{\i}tre-Tolman-Bondi wormholes in a Friedmann universe
Kirill A. Bronnikov, Valeria A. Ishkaeva, Sergey V. Sushkov
https://arxiv.org/abs/2509.09797

Gravitational lensing by Lema\^ıtre-Tolman-Bondi wormholes in a Friedmann universe
The Lema\^ıtre-Tolman-Bondi (LTB) solution to the Einstein equations describes the dynamics of a self-gravitating spherically symmetric dust cloud with an arbitrary density profile and any distribution of initial velocities, encoded in three arbitrary functions $f(R)$, $F(R)$, and $τ_0(R)$, where $R$ is a radial coordinate in the comoving reference frame. A particular choice of these functions corresponds to a wormhole geometry with a throat defined as a sphere of minimum radius at a fixed ti…

A dark energy model for coasting cosmology
Yunliang Ren, Xiaofeng Yang, Xuwei Zhang, Shuangnan Chen, Yangjun Shi, Cheng Cheng, Xiaolong He, Hoernisa Iminniyaz
https://arxiv.org/abs/2509.15039

A dark energy model for coasting cosmology
Coasting cosmology offers an intriguing and straightforward framework for understanding the universe. In this work, we employ the Trans-Planckian Censorship Criterion (TCC) conjecture to test the viability of the coasting cosmology and propose an entropic dark energy (EDE) model within this framework. By applying the holographic principle to constrain the dark energy density and adopting the Bekenstein entropy and Tsallis entropy as the constraining entropies of the system, we find that, in a h…

Topological Big Bangs: Reflection, Itty-Bitty Blenders, and Eternal Trumpets
Hubert Bray, James Wheeler
https://arxiv.org/abs/2509.11573 https://arxiv.org/…

Topological Big Bangs: Reflection, Itty-Bitty Blenders, and Eternal Trumpets
We discuss and formalize a topological means by which the initial singularity might be mollified, at the level of the spacetime manifold's structure, in classical cosmological models of a homogeneous expanding universe. The construction, dubbed a "reflective" topological big bang, generalizes Schrodinger's elliptic de Sitter space and is built to be compatible with the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) picture of the large-scale universe, only minimally modifying it via some n…

A quantum information method for early universe with non-trivial sound speed
Shi-Cheng Liu, Lei-Hua Liu, Bichu Li, Hai-Qing Zhang, Peng-Zhang He
https://arxiv.org/abs/2510.04011

A quantum information method for early universe with non-trivial sound speed
Many quantum gravitational frameworks, such as DBI inflation, k-essence, and effective field theories obtained by integrating out heavy modes, can lead to a non-trivial sound speed. Meanwhile, our universe can be described as an open system. Under the non-trivial sound speed, we employ the method of open quantum systems combined with Arnoldi iterations to study the Krylov complexity throughout the early universe, including the inflationary, radiation-dominated, and matter-dominated epochs. A ke…

Strong progenitor age bias in supernova #cosmology – I. Robust and ubiquitous evidence from a larger sample of host galaxies in a broader redshift range / II. Alignment with DESI BAO and signs of a non-accelerating universe: https://academic.oup.com/mnras/article/538/4/3340/8098234 / https://academic.oup.com/mnras/article/544/1/975/8281988 -> Universe's expansion 'is now slowing, not speeding up': https://ras.ac.uk/news-and-press/research-highlights/universes-expansion-now-slowing-not-speeding (this has been claimed by the group since at least 2023 - http://vietnam.in2p3.fr/2023/windows/transparencies/02_tuesday/Astro_5/01_Son.pdf - and is rejected by the SN cosmology community as https://bsky.app/profile/astromarc.bsky.social/post/3m4xmikwfds26 explains).

James Burkett Hartle: a Biographical Memoir
Gary T. Horowitz, Kip S. Thorne
https://arxiv.org/abs/2509.14288 https://arxiv.org/pdf/2509.14288

James Burkett Hartle: a Biographical Memoir
James Burkett Hartle was a theoretical physicist who made major contributions to our understanding of relativistic stars, black holes, and cosmology. Most of his career, however, was devoted to studying the universe as a quantum system. As a result, he was known as the father of quantum cosmology. He is best known for two seminal papers with Stephen Hawking that introduced two quantum states of fundamental importance: the "Hartle-Hawking vacuum" for matter fields outside a black hole, and the "…