Relic Neutrino Background Density and Temperature After a Bounce

This paper computes a specific neutrino quantity in a cosmology whose collapse is regulated by a maximum density, the Aldred Limit evaluated on its neutron branch at 9.72e+54 grams per cubic centimetre. The cosmic neutrino background is the oldest particle background in principle accessible, decoupled when the universe was about one second old. Its present temperature and number density are firm predictions of the standard history, and any earlier episode that injected or removed entropy would rescale both. The calculation gives the following headline values: T_nu_K = 1.9453688391750839, n_per_species_cm3 = 112.0, n_total_cm3 = 336.0, T_gamma_K = 2.7255, fractional_change_bound = 4.1095615496779844e-49, T_shift_K = 7.994612981415619e-49. Each value is obtained from stated assumptions by the deposited script and is compared with published observational values where such values exist. Where the computed frame effect is far below observational reach, that negative result is stated plainly rather than softened. This study is simulated and computed from stated assumptions; it is not a measurement.