lhd1an hour ago
One of the cool facts about gravity is that the gravitational field of a body 'feels' spherical at a distance, even if those bodies are not spherical themselves. There are higher multipoles but they are increasingly suppressed the further you are from the body. So at least for gravity the spherical approximation turns out to be good and justified.
DroneBetteran hour ago
for simulating gravity in particular you can do one better, since a sphere is in turn gravitationally indistinguishable from a point mass due to the https://en.wikipedia.org/wiki/Shell_theorem#Force_on_a_point...
lhd135 minutes ago
and you can do one better than that - Birkhoff's theorem, the relativistic analogue of the shell theorem.
https://en.wikipedia.org/wiki/Birkhoff%27s_theorem_(relativi...
analog313 minutes ago
What udder nonsense.
turbostar2 hours ago
Anna Cramling, women’s international chess master, should review this paper, having popularized the Cow Opening.
Bowes-Lyon2 days ago
Hmmm… Today is Sep 1st, not Apr 1st. That cow is a bit out of season :)
jitl2 hours ago
> Submitted on 1 Apr 2025 (v1), last revised 1 Apr 2026 (this version, v2)
colechristensenan hour ago
Submission history
From: Benjamin Lehmann [view email]
[v1] Tue, 1 Apr 2025 07:55:39 UTC (2,401 KB)
[v2] Wed, 1 Apr 2026 12:28:24 UTC (3,845 KB)