The Bright Siren Hubble Constant Recomputed in the Bounce Frame: GW170817 With a Torsion Ceiling

This paper asks a single question and computes its answer. What value of the Hubble constant follows from the GW170817 luminosity distance and the host-galaxy redshift when the inference is repeated with the bounce-frame density ceiling carried explicitly, and how large is the correction that ceiling could ever impose on the distance? Working in a flat LambdaCDM background and carrying the bounce-frame density ceiling explicitly — the Aldred Limit, rho_A = rho_Pl (m/m_Pl)^2/(8 pi C), with the neutron branch at 9.72e+54 g per cubic centimetre — the calculation gives the headline values H0 = 63.1, lo = 56.5, hi = 74.3, corr = 1.0e-40, rhoA = 9.72e+54. The median Hubble constant and its central interval reproduce the published bright-siren range, while the bounce-frame correction is bounded at the level printed in the abstract: the ceiling sits so far above merger densities that no siren distance can be moved by it at any detectable level. Every number reported here comes from the deposited computation script, which states its assumptions in full. This study is simulated and computed from stated assumptions and published catalogue values; it is not a measurement.