Prépublication
· 2026 arXiv
EN
We develop a unified description of convolution on the sphere by lifting to the rotation group. A number of definitions of spherical convolution have been proposed, differing in whether the kernel is axisymmetric or directional, whether the output is on the sp...
J. D. McEwen
#math-ph
Prépublication
· 2026 arXiv
EN
Contemporary large-scale structure analyses center around the galaxy power spectrum, modeled with one-loop perturbation theory. This description naturally breaks down at large wavenumbers, prohibiting the extraction of cosmological information from small-scale...
Oliver H. E. Philcox
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Planet interior models have revealed that warm Jupiters should harbor large heavy element masses (up to 30-40% of the planetary mass). Within the pebble drift and evaporation scenario, inward drifting pebbles can evaporate and enrich the inner disc with vapor...
Bertram Bitsch
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
If cosmic acceleration is driven by a positive cosmological constant, the universe approaches an eternally accelerating de Sitter state, whose interpretation in quantum gravity remains elusive. We develop a framework in which acceleration is instead a transien...
Gianmassimo Tasinato
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
The PLATO mission, planned to launch in spring 2027, will observe a fixed Southern field, LOPS2, for at least 2 years with the goal of discovering and deriving precise parameters for planets as small as Earth around FGK dwarfs and sub-giants. Afterwards, PLATO...
Yoshi Nike Emilia Eschen, Michelle Kunimoto et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Tidally-locked planets express a range of climate regimes distinct from those found in our solar system. Their atmospheres are often dominated by planetary-wide overturning circulations and super- rotating jets. In this paper we explore the hydrological cycle...
Daniel A. Williams, Geoffrey K. Vallis et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Saturn's icy moon Enceladus is a prime target in the search for life beyond Earth. Abundant H2 and CH4 in Enceladus's south-polar plume have been shown to be consistent with hydrogenotrophic methanogens feeding on products of long-lived serpentinization. Howev...
Sam Nasreldine, Antonin Affholder et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Redshift space distortions (RSD) provide a powerful measurement of structure formation in modern cosmology. In this work, we explore the potential of 21cm intensity mapping with the MeerKAT Large Area Synoptic Survey (MeerKLASS) to detect RSD and probe gravity...
Daniel Tassie, Steven Cunnington et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We apply a two-layer thermophysical model, with water sublimating from below a dust-crust with dynamically varying depth, to simulate the water outgassing rate, dust-ejections, and non-gravitational forces and torques of comet 67P/Churyumov-Gerasimenko. The du...
Nicholas Attree, Yuri Skorov et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Aims: To analyse the impact of dynamically formed binaries emerging naturally from various star cluster environments on already established planetary systems. Methods: Numerical simulations replicating the star-forming region NGC 1333 are conducted. We conside...
Erwan Hochart, Simon Portegies Zwart
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Near the ocean surface, tropical cyclone winds change rapidly with height, but direct measurements are limited because aircraft dropsondes provide only sparse and irregular observations. Continuous wind profiles are important for understanding hurricane bounda...
Jian Ma, Yilin Yang et al.
#physics.ao-ph
Prépublication
· 2026 arXiv
EN
Skillful prediction of biomass-burning activity several days in advance is important for air-quality forecasting and aerosol prediction. Two operational constraints motivate this work. First, the GBBEPx satellite fire radiative power (FRP) product used to init...
Li Zhang, Jun Wang et al.
#physics.ao-ph