Prépublication
· 2026 arXiv
EN
The global topology of the Universe is a longstanding open question. In this work, we examine the statistical signatures of a positively curved universe with a Friedmann--Lemaitre--Robertson--Walker metric and the topology of a lens space $L(p,q)$. Since these...
Mikel Martin Barandiaran, Catherine Petretti et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Gravitational waves from vacuum first-order phase transitions probe the nonlinear dynamics of relativistic bubble collisions. Predicting their spectrum requires resolving Lorentz-contracted scalar bubble walls throughout a volume containing many bubbles, makin...
Malte Buschmann, Toby Opferkuch
#gr-qc
Prépublication
· 2026 arXiv
EN
In recent years, simulation-based inference (SBI) methods have been proposed to address several data-analysis challenges faced by existing and planned gravitational-wave experiments. For example, SBI classification has recently been shown to significantly impr...
James Alvey, Andrea Mitridate et al.
#astro-ph.IM
Prépublication
· 2026 arXiv
EN
Since 2001, we have used the TEXES high resolution mid-infrared spectrograph at NASA's Infrared Telescope Facility to study the density of Io's SO$_{2}$-dominated atmosphere. The spectra cover several SO$_{2}$ absorption lines near 530 cm$^{-1}$ and are used t...
R. S. Giles, J. R. Spencer et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Climate multistability and tipping points are fundamental properties of planetary climates that depend sensitively on climate feedbacks. We introduce the Geneva Energy Balance Model (Gen-EBM), a new 1-D latitudinal EBM for rapid exploration of terrestrial plan...
Siddharth Bhatnagar, Emeline Bolmont et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We present the `Bias of Overdensities in Large-scale Tracers on the Sphere' (BOLTS) model, a novel analytic galaxy bias model for projected fields on the sphere that incorporates stochasticity and non-locality already at linear order while enforcing physicalit...
Maximilian von Wietersheim-Kramsta, Nicolas Tessore et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We present a post-processing pipeline that predicts CO line luminosities, molecular hydrogen masses, and CO abundances for galaxies in the Feedback in Realistic Environments (FIRE-2) simulations, as a first step toward CO response functions for line intensity...
Doğa Tolgay, Norman W. Murray et al.
#astro-ph.GA
Prépublication
· 2026 arXiv
EN
We report a direct measurement of the 21-cm signal from neutral hydrogen (HI) via the intensity mapping technique at redshift $z = 0.42$ through its power spectrum at cosmological scales $0.095\,h\,{\rm Mpc}^{-1}
MeerKLASS Collaboration, Matilde Barberi-Squarotti et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
The finding that galaxies in the first 500Myr were much more numerous and/or brighter than expected is often cited as one of the main discoveries of the James Webb Space Telescope in its first four years of operation. This result is now solidly based on an imp...
A. Fontana, H. Atek et al.
#astro-ph.GA
Prépublication
· 2026 arXiv
EN
Supernovae (SNe) are excellent probes of the physical, chemical, and cosmological context of galaxies across the history of the Universe. The James Webb Space Telescope (JWST ) has a truly unique combination of wavelength, sensitivity, and resolution, providin...
Justin Pierel, David Coulter et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
The small satellites of dwarf-planet size worlds in trans-Neptunian space are thought to be produced through giant impacts, and are typically observed to have bright water-ice-dominated surfaces. Here we focus on Quaoar's small primary satellite, Weywot. We bu...
Cameron Collyer, Estela Fernandez-Valenzuela et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Stellar granulation imprints line-dependent wavelength shifts and profile variations that limit the precision of radial velocity (RV) measurements used for exoplanet detection and characterization. Understanding how the sensitivity of individual spectral lines...
Dušan Vukadinović, Sowmya Krishnamurthy et al.
#astro-ph.SR