Prépublication
· 2026 arXiv
EN
Recent cosmological constraints on the sum of neutrino masses have reached, and in some analyses fallen below, the minimum value implied by the normal mass ordering, suggesting a possible tension with neutrino-oscillation measurements. We investigate whether t...
Gabriel Rodrigues, Jamerson Rodrigues et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Extreme debris disks are signposts of violent rocky collisions, but it remains unclear whether their mid-infrared variability traces transient dust clouds or longer-lived post-impact reservoirs. We analyze a 19 yr mid-infrared record of the young solar analog...
Xiaodian Chen, Shu Wang et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We study the mixing between a generic axion-like particle (ALP) and the light pseudoscalar mesons within chiral perturbation theory ($χ$PT), and its consequences for low-energy scattering and decay processes. Starting from the most general ALP effective Lagran...
Noé Duarte-González
#hep-ph
Prépublication
· 2026 arXiv
EN
We report the discovery of PALTA-1 b, a sub-Jupiter mass exoplanet candidate orbiting the nearby early-L dwarf DENIS-P J1253108-570924 (DE1253-57) located at a distance of ~17 pc. The exoplanet was discovered by monitoring the L dwarf's astrometric motion with...
J. Sahlmann, P. F. Lazorenko et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We report new ALMA Band 7 high-resolution ($\sim$0.05$^{''}$) continuum and $^{12}\text{CO}\ (J=3\text{--}2)$ observations of the disk around the young low-mass star Sz 76. Visibility-plane modeling reveals a previously undetected, faint outer dust ring center...
Giulia Ricciardi, Anna Miotello et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Ultracool dwarfs exhibit radio emission revealing strong magnetic fields and complex magnetospheric processes. Their auroral emission resembles that observed in magnetized Solar System planets, providing a framework to investigate their magnetic topology. We a...
D. Martín-Carrero, J. B. Climent et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Cosmic birefringence, the rotation of the polarization plane of CMB photons, provides an intriguing probe of physics beyond the Standard Model. In this paper, we investigate a vector Chern-Simons coupling between the neutrino current and photons as a possible...
Kentaro Kasai, Ippei Obata
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We present a low entry barrier numerical code LazyTB that solves the Einstein equations in the ADM-formulation for a general spherically symmetric problem with an arbitrary number of fluids with user defined equations of state and optional interactions between...
Kimmo Kainulainen, Enrico Schiappacasse et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Identifying the process relevant to planet formation is still a major task. Mechanisms have been identified that can trap dust, preventing it from migrating inwards. A particular hydrodynamic instability, known as the streaming instability, is of high interest...
Dominik Hetzel Ostertag, Mario Flock et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Studies with 1-m class telescopes have now established that glints from satellites and space debris are the main obstacles to searches for sub-minute optical transients. Here, we report a study of this foreground using observations from the Legacy Survey of Sp...
G. Megias Homar, S. R. Kulkarni et al.
#astro-ph.IM
Prépublication
· 2026 arXiv
EN
Cosmological first-order phase transitions can generate curvature perturbations through inhomogeneous quantum tunneling, as studied previously on superhorizon scales. In this work, we for the first time conduct three-dimensional lattice simulations that incorp...
Yuan-Jie Li, Jing Liu et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Constellation Monte Carlo results depend on the orbital population used to evaluate a tasking policy. With scarce reference trajectories, replay limits geometric diversity, while independent orbital-element jitter can violate physical constraints. We study con...
Omar Ramadan, Sam Siavoshian et al.
#astro-ph.IM