Prépublication
· 2026 arXiv
EN
The Nancy Grace Roman Space Telescope's Coronagraph Instrument (CGI) will provide the first opportunity to directly detect mature giant exoplanets in reflected light. However, most known radial-velocity planets lie near CGI's sensitivity limit. In contrast, Sa...
Elizabeth Lane, Mary Anne Limbach et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Galaxy-galaxy lensing (GGL) is a critical probe of cosmology and galaxy formation. However, predicted GGL amplitudes tend to be $\sim 20-40\%$ higher than observations, primarily on small scales, a tension called the lensing-is-low problem. If not resolved thr...
Kimiko Queen, Abigail V. Fisher et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
The evidence, $\mathcal{Z} = p(x | \mathcal{M})$, of a data-generating model $\mathcal{M}$ is a powerful tool in Bayesian frameworks: it enables model inference, model misspecification tests, and goodness-of-fit assessment as an alternative to standard discrep...
Kai Lehman, Jameson Dong et al.
#stat.ML
Prépublication
· 2026 arXiv
EN
Many of the most important datasets in the physical sciences live natively on the sphere, and these data often carry no preferred position or orientation. Using methods that do not reflect this symmetry leads to far higher simulation requirements, which can be...
Joshua Williamson, Niall Jeffrey et al.
#stat.ML
Prépublication
· 2026 arXiv
EN
Scalar-induced gravitational waves (SIGWs) provide a powerful probe of the expansion history of the universe prior to the Big Bang. Indeed, the production of such gravity waves depends on the evolution of first-order scalar perturbations within the early unive...
Keith R. Dienes, Fazlollah Hajkarim et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We use the observed abundance and spatial clustering of JWST little red dots (LRDs) over z = 4--8 to confront two formation scenarios: the standard picture in which LRDs form in virialized dark-matter halos, and one in which they are seeded by a dynamically su...
Gert Hütsi
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Hidden sectors are generic in beyond the Standard Model constructions and string compactifications. We consider models featuring hidden sectors that have dark matter candidates. The relic density is set in part by the energy-injecting inflaton branching ratio...
Donald Liveoak, Anshuman Maharana et al.
#hep-ph
Prépublication
· 2026 arXiv
EN
It has been argued that the inverse distance ladder disfavours late-time solutions to the Hubble tension. We test this with a cosmographic expansion where $H$ is a fourth-order polynomial in $1 - a$. We combine the uncalibrated DES-Dovekie SNIa with DESI~DR2 B...
José Antonio Nájera, Indranil Banik et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Context. Short-term millimeter-wavelength variability in Class II young stellar objects (YSOs) has been considered minimal, often dismissed as very rare in ALMA-based studies on short timescales. However, recent findings suggest that variability on sub-day tim...
D. Krebs, A. Hacar et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
We present a comprehensive spectroscopic census of the Orion Nebula Cluster (ONC), based primarily on low-resolution optical spectroscopy obtained with MMT/Hectospec. We derive spectral types, youth indicators, and accretion diagnostics for 1513 stars located...
Jesús Hernández, Ezequiel Manzo-Martínez et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
In the standard $Λ\rm CDM$ model, the Universe will keep expanding forever and its lifetime is infinite. Therefore, even the heaviest supermassive black hole will eventually evaporate and the universal occurrence of the black hole information paradox is unavoi...
Ngo Phuc Duc Loc
#hep-ph
Prépublication
· 2026 arXiv
EN
Radio galaxies play a significant role in galaxy evolution through feedback mechanisms, making it important to characterize the environments in which they reside. We measure the cross-correlation between the positions of radio sources in the MIGHTEE survey and...
Joel Hamlett, Catherine L. Hale et al.
#astro-ph.CO