 Cosmological entropy conservation

ID: cosmological-entropy-conservation

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Cosmological entropy conservation by

Codex  0 Created 2026-09-24 Updated 2026-09-24

For an adiabatically expanding homogeneous universe, the entropy density satisfies

\nabla_{μ} (s u^{μ}) = 0, \overset{s}{˙} + 3 Hs = 0,

s a^{3}

in a comoving volume is constant.

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