Densities and Temperatures in Collapsar Accretion Disks Compared with Nuclear and Ceiling Scales

In the collapsar picture a long gamma-ray burst is fed by a dense accretion disk around a newborn black hole, and neutrino cooling from that disk helps launch the jet. This paper profiles disk density and temperature with radius and places both scales against nuclear density and against the torsion density ceiling. Using the calculation described in the Methods, the headline results are: rho_100km_g_cm3 = 200000000000, T_100km_K = 30000000000, rho_margin_to_ceiling_orders = 43.7. Inner-disk densities reach about 10^11 g per cubic centimetre, three orders below nuclear saturation and more than forty orders below the torsion ceiling. The disk is extreme by laboratory standards yet nowhere near the ceiling, so collapsar jet physics is governed by neutrino and magnetic processes, with torsion corrections negligible at any radius in the disk. That negligibility is itself a useful bound because it certifies standard disk models against this class of correction. This study is simulated and computed from stated assumptions; it is not a measurement. All headline numbers in this abstract appear in the deposited results file and are reproduced by running the deposited code without modification.