Weak Reactions and Neutrino Energy Loss in Q-Interaction Collapse

Paper IV of the Early Black-Hole Formation Series extends the homogeneous Q-interaction collapse benchmark of Paper III to include neutron beta decay and electron and positron capture. The model tracks energy transferred from matter to emitted neutrinos in a separate component of the total stress–energy, with zero net spatial flux. At an initial baryon density of 10²⁵ cm⁻³, nuclear-composition feedback on the equation of state advances marginal trapping by 24.464 ms with charged-current emission either enabled or disabled. With emission enabled, the feedback also raises kBT at the marginal event by 0.34145 keV. The accompanying archive contains the XeLaTeX source, numerical solver, output tables, and reproduction instructions.