Prépublication
· 2026 arXiv
EN
Jupiter's faint ring system contains micron- and submicron-sized dust whose dynamics are influenced by the planet's rapidly rotating magnetic field. Optical observations have established the morphology of the main ring and halo, but tenuous dust close to Jupit...
Wenyu Zhang, Hao Cao et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
No: neither through the bosenovae of gravitational atoms formed around stars and compact objects, nor through those of boson stars formed in the galactic dark-matter halo. We assume that all the dark matter consists of ultralight bosons with attractive self-in...
Samuel Gómez Gómez, Joshua Eby
#astro-ph.HE
Prépublication
· 2026 arXiv
EN
How galaxies stop forming stars is a complex and central problem in astrophysics. Numerous physical mechanisms have been proposed, yet a simple, unified framework connecting these mechanisms remains lacking. Here, we derive a step-function quenching response f...
Zhicheng He, Enci Wang et al.
#astro-ph.GA
Prépublication
· 2026 arXiv
EN
The probability of interstellar contact depends not only on the abundance of technological civilizations but also on their spatial connectivity. Treating civilizations as nodes linked whenever their separation is smaller than the distance a signal travels with...
Kohji Tsumura
#astro-ph.GA
Prépublication
· 2026 arXiv
EN
Line intensity mapping (LIM) provides a unique window into the high-redshift universe, but the separation of signals from overlapping emission lines and bright continuum foregrounds remains a central analysis challenge. At millimeter wavelengths in particular,...
Carlos E. Sierra, Kirit S. Karkare
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
ALMA high-resolution surveys have so far focused mainly on large, bright protoplanetary disks, where substructures are routinely detected, leaving compact disks poorly characterized. Yet, the survival of millimeter emission in Class II sources implies that rad...
Pietro Curone, Gijs D. Mulders et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
In Inflation without an Inflaton (IWI), a de Sitter (dS) background drives inflation, and the graviton bilinear generates scalar perturbations at second order, with no inflaton or additional fundamental scalar field. We investigate how this scenario can accoun...
Raul Jimenez, Daniele Bertacca et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We investigate the global dynamics and cosmological viability of non-singular solutions in an anisotropic Bianchi type I universe featuring an interacting vacuum energy component $V$ and a perfect fluid $ρ$, extending previous work based on a Robertson-Walker...
Marco Bruni, Rodrigo Maier et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
It is conventionally believed that the Stochastic Gravitational-Wave Background (SGWB) from inflation provides information about the earliest universe. However, in this Letter, we present a different picture. Our analysis starts from the observation that the i...
Hongguang Zhang, Zhengyang Qiu et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Forthcoming cosmic microwave background (CMB) experiments are targeting ambitious science goals, including the exploration of the particle content of the Universe across cosmic times and the search for the faint signal from primordial gravitational waves. To p...
Camille Demay, Magdy Morshed et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We reanalyze the total solar eclipse images taken with a consumer camera during the Artemis II lunar flyby, using the RAW data as ground truth for our previous analysis of the released JPEG image. Calibrated with field stars, the RAW data show that the lens vi...
Kohji Tsumura, Ko Arimatsu
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Galaxy-to-galaxy stochasticity may be less important for reionization, IGM heating, and the 21-cm signal than commonly assumed. We find that most of its apparent impact arises because introducing or removing scatter changes the mean emissivity of the galaxy po...
Shihai Zhu, Yuxiang Qin
#astro-ph.CO