Prépublication
· 2026 arXiv
EN
The Hubble tension motivates direct tests of the internal consistency of the local distance ladder. We perform forward and backward consistency checks between Type Ia supernovae in Cepheid host galaxies and the Hubble-flow supernova sample using Pantheon+ data...
Haotian Dong, Marek Biesiada et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
A detection of primordial $B$ modes in the Cosmic Microwave Background (CMB) polarisation relies on a robust control and removal of contamination from astrophysical polarised foreground emission. We examine how much polarised extragalactic point sources may co...
Arianna Rizzieri, Giorgia Zagatti et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Cosmic filaments represent the environments in which most galaxies form and evolve. However, the spatial distribution of filaments and the link between galaxy properties and their positions relative to filaments remains unclear, particularly at high redshifts....
Qiaoyang Hao, Tao Wang et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We calculate the relativistic axion energy density produced by the decay of a curvature-displaced Peccei--Quinn condensate in a quartic KSVZ model. We follow the radial PQ field (the saxion) as it relaxes from its inflationary minimum and determine the survivi...
Sidhartha Samtani, Amartya Sengupta
#hep-ph
Prépublication
· 2026 arXiv
EN
Gravitational waves (GWs) and 21-cm intensity mapping (IM) are emerging as complementary cosmological probes: GWs provide direct luminosity-distance measurements, while neutral-hydrogen (HI) IM traces the matter distribution in redshift space. Their synergy of...
Dounia Nanadoumgar-Lacroze, Konstantin Leyde et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Recent DESI observations hint at a preference for dynamical dark energy with an equation of state that crosses the phantom divide within the Chevallier-Polarski-Linder (CPL) parameterization. In this work, we assess the consistency of the CPL parameterization...
Tian-Yang Sun, Tian-Nuo Li et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
In this work, we survey M-type stars within 15 pc observed by Gaia based on their colour, magnitude, and quality of astrometric data. We aim to detect new substellar companions using primarily Gaia astrometry and, when available, proper-motion anomaly (PMa) al...
F. Destriez, A. -M. Lagrange et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
The over $5σ$ Hubble tension continues to motivate modifications of the standard $Λ$-cold-dark-matter ($Λ\rm CDM$) model. The large number of proposed resolutions for the Hubble tension, broadly divided into early- and late-time solutions, motivates phenomenol...
Jia-Le Ling, Shao-Jiang Wang
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Test-time scaling has emerged as a key inference strategy for reasoning models, where a model generates a large number of candidate solutions in the hope of finding at least one correct solution. Running all candidate solutions to completion can be computation...
Mahdi Salmani, Adel Javanmard et al.
#cs.AI
Prépublication
· 2026 arXiv
EN
Wrong automatic routing of an IT support ticket can cost more than human triage. We evaluate cost-aware abstention as an offline, cost-conditional readiness assessment: select a routing policy on calibration data under explicit costs, then evaluate that frozen...
Sachin Gupta
#cs.LG
Prépublication
· 2026 arXiv
EN
Meta-reinforcement learning aims to train agents that adapt quickly to unseen tasks from limited interaction, but this requires representing task evidence over long interaction histories. Classical recurrent agents compress experience into hidden states, while...
Ali Najar, Hosein Hasani et al.
#cs.LG
Prépublication
· 2026 arXiv
EN
Tool-using language model agents rely on environmental facts to decide whether an action is permitted. When a tool response omits a safety-relevant fact, an agent may carry out a prohibited action even though the user request is benign and every returned state...
Qijin Zhang, Hanzhen Wang et al.
#cs.AI