Electroweak Baryogenesis at a Bounce: A Window the Bounce Does Not Open

Electroweak baryogenesis needs a strongly first-order electroweak phase transition, quantified by v_c/T_c >= 1, which the Standard Model does not provide at the measured Higgs mass. A hopeful suggestion is that a bounce cosmology might alter the expansion rate at the transition enough to change the outcome. This paper tests the suggestion with numbers and rejects it. At 100 GeV the radiation density is 1.53e+28 kg per cubic metre, a fraction 1.57e-30 of the torsion density ceiling; the corresponding correction to the expansion rate is of order 1.25e-15. No plausible reading of so small a correction converts a crossover into a strong transition, and the washout-avoidance condition remains exactly as it is in the standard history. The negative result is stated plainly: in this framework the bounce neither rescues electroweak baryogenesis nor damages it, and the mechanism stands or falls on particle physics, as before. Computed from stated assumptions, not measured.