Entropy of Gravitational Waves Produced at a Bounce

The gravitational-wave entropy is a fixed, substantial fraction of the photon entropy rather than a negligible trace, because a decoupled relativistic background cools only by the degrees-of-freedom factor. Any complete budget that omits it understates the radiation-sector entropy by that fraction. The computation is performed from stated assumptions in a density-limited bounce, in which the neutron-branch limit density sets a maximum density, a finite bounce temperature, and a minimum horizon size. Headline values from the deposited calculation are: T_gw_K = 1.27; s_gw_J_K_m3 = 2.06e-15; s_ph_J_K_m3 = 2.04e-14; ratio_gw_to_photon = 0.101; S_gw_kB = 5.32e+88; Omega_GW_assumed = 1.00e-06. The study is simulated and computed, not measured, and its conclusions are stated at the precision the stated assumptions support.