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292 documents correspondants.

Prépublication · 2026 arXiv EN

Properties and limitations of linear models for mutual coupling in 21 cm arrays

Mutual coupling between elements of low-frequency arrays is a leading systematic for 21 cm cosmology, leaking bright foregrounds into otherwise clean regions of the power spectrum. Many mitigation models describe coupling as a linear combination of uncoupled s...

Vincent MacKay, Robert Pascua et al. #astro-ph.IM
Prépublication · 2026 arXiv EN

The gravitational constant and the cosmic microwave background

The CMB constrains the gravitational constant $G$ at recombination to a few percent of its laboratory value, but the effect of $G$ on recombination itself is usually absorbed into a global fit rather than made explicit. We return to the semi-analytic descripti...

Brahim Lamine, Sébastien Beauchamp et al. #astro-ph.CO
Prépublication · 2026 arXiv EN

Time-reversible timestepping in many-body planetary systems

Simulating chaotic planetary system evolution requires resolving small time-scales due to close encounters, scattering, collisions, and more. Simulations typically assign fixed timesteps to all particles, however, which is inefficient and wastes compute resour...

David M. Hernandez, Tenri Jinno et al. #astro-ph.EP
Texte transcrit Wikisource FR

Astronomie populaire (Arago)

Extrait : sciences - Astronomie populaire, tome 4.djvuArago - Œuvres complètes de François Arago, secrétaire perpétuel de l’académie des sciences - Astronomie populaire

Wikisource #Astronomie