Neutrino Self-Interaction Bound from Bounce-Era Equilibrium

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. Secret neutrino self-interactions, mediated by a light or heavy particle not in the standard model, are invoked to alter free-streaming and to address several cosmological tensions. Their strength is bounded by the requirement that neutrinos were not kept in equilibrium far below their standard decoupling temperature. The calculation gives the following headline values: G_eff_limit_GeV_minus2 = 2.1113699425032667e-05, ratio_to_GF = 1.8101924722247302, T_MeV = 1.0, 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.