Neutrino-Antineutrino Asymmetry Survival Through 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. An asymmetry between neutrinos and antineutrinos, unlike a flavour asymmetry, can hide in the relic background while affecting nucleosynthesis through the electron flavour alone. Its survival through a bounce is a separate question from the survival of a total lepton number, because flavour-changing and pair processes act differently on the two. The calculation gives the following headline values: initial_asymmetry = 0.01, survival_fraction = 1.0, equilibrium_asymmetry_at_1MeV = set by chemical potential mu/T, washout_exponent_bound = 4.1095615496779844e-49, rhoA_kg_m3 = 9.717779835388742e+57. 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.