Motti Intermediate Physics — HAL: Neutron Stars, Multi-Messenger Gravitational Waves, and Standard Sirens

HAL framework predictions for neutron star systems. TOV equation with G_eff gives identical NS structure to GR, but gravitational mass M_grav = C0 x M_ADM, giving +10.2 milli-solar-masses for 1.4 M_sol NS, detectable with Einstein Telescope. Key new result: phase-dependent GW amplitude correction: epsilon = (2/3) x alpha_em = 0.486% during inspiral, epsilon = alpha_em = 0.7297% at merger/ringdown. The ratio 2/3 is an internal HAL consistency test. Standard siren H_0 = 67.73 km/s/Mpc (0.19 sigma from GW170817).