Bremermann Rate per Unit Mass Recomputed with a Finite Density Ceiling

This paper examines whether quoting a processing rate per kilogram without a density ceiling overstates what matter can do. The calculation is performed in a frame with a finite maximum density, the neutron-branch value rho_A = 9.718e+57 kg per cubic metre, with the electron branch at 2.874e+51 kg per cubic metre for comparison. Headline results include a bounce temperature of 3.278e+22 K, a Landauer cost at that temperature of 3.137e-01 J per bit against 2.871e-21 J per bit at 300 K, a Bekenstein allowance of 1.049e+94 bits for the stated centimetre reference region, and a Margolus-Levitin rate of 2.209e+103 per second for the same region. Per kilogram the formal rate follows from rest energy alone, while per region the density ceiling, not the mass, is what terminates the scaling. All numbers are computed from the stated assumptions in the accompanying script; the study is simulated and computed, not measured.