Entropy of the Relic Neutrino Background Carried Through a Bounce
Year: 2026
Type: article
Abstract: The neutrino entropy is comparable to, and slightly below, the photon entropy today, and adiabatic transport preserves the ratio through the bounce. If re-coupling occurred at the bounce temperature the background would be reprocessed rather than preserved, which would erase the decoupling signature; the preservation result therefore doubles as a statement about which bounce temperatures are compatible with an intact relic background. The computation is performed from stated assumptions in a density-limited bounce, in which the neutron-branch limit density sets a maximum density, a finite bounce temperature, and a minimum horizon size. Headline values from the deposited calculation are: T_nu_K = 1.95; n_nu_per_m3 = 3.36e+08; S_nu_kB = 3.78e+89; T_bounce_K = 3.28e+22; Tnu_over_Tbounce = 5.93e-23. The study is simulated and computed, not measured, and its conclusions are stated at the precision the stated assumptions support.
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225816963
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