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June 28, 20260 citationsOpen Access

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

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MAMordecai Gavila Alvarez

Key Points

  • This research aims to predict neutron star properties and gravitational wave characteristics using the HAL framework.
  • Predictions based on the TOV equation under altered gravitational parameters.
  • Analysis of phase-dependent gravitational wave amplitude corrections during inspiral and merger.
  • Utilization of standard sirens to estimate H_0 for cosmological implications.
  • Gravitational mass for a 1.4 M_sol neutron star is predicted at 10.2 milli-solar-masses detectable by the Einstein Telescope.
  • Identified phase-dependent corrections to gravitational wave amplitude: 0.486% during inspiral and 0.7297% at merger/ringdown.
  • Standard siren value for H_0 calculated as 67.73 km/s/Mpc, with a deviation of 0.19 sigma from previous results.

Abstract

HAL framework predictions for neutron star systems. TOV equation with Gₑff gives identical NS structure to GR, but gravitational mass Mgrav = C0 x MADM, giving +10. 2 milli-solar-masses for 1. 4 Mₛol NS, detectable with Einstein Telescope. Key new result: phase-dependent GW amplitude correction: epsilon = (2/3) x alphaₑm = 0. 486% during inspiral, epsilon = alphaₑm = 0. 7297% at merger/ringdown. The ratio 2/3 is an internal HAL consistency test. Standard siren H₀ = 67. 73 km/s/Mpc (0. 19 sigma from GW170817).

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Cite This Study

Mordecai Gavila Alvarez (2026) studied this question.

synapsesocial.com/papers/6a40ba8861bb0a67205c6694https://doi.org/10.5281/zenodo.20933385
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