2025/05/20 by Huang, Chun · 6 citations
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #Nuclear Theory (nucl-th) #Solar and Stellar Astrophysics (astro-ph.SR)
paper · doi:10.48550/arxiv.2505.14822
Tidal deformability of a 1.4 M_\odot neutron star provides a pivotal window into the physics of dense nuclear matter, bridging gravitational-wave(GW), electromagnetic observations and nuclear physics. In this work, we present a novel, data-driven approach to constrain Λ1.4 without invoking specific equation-of-state(EOS) models. By interpolating directly over the mass--tidal-deformability posteriors from GW170817, we obtain an EOS-independent constraint of Λ1.4 = 222.89-98.85+420.33. We further combine these GW-based results with the X-ray EOS-independent constraint from \citeHuang2025, deriving a multimessenger limit of Λ1.4 = 265.18-104.38+237.88, which remains largely EOS agnostic. This framework demonstrates that higher-order terms neglected in linear expansion methods do not significantly affect Λ1.4 estimates under current observational uncertainties. As gravitational-wave detectors improve in sensitivity and more binary neutron-star mergers are discovered, our purely data-driven strategy can serve as a robust standard baseline for extracting neutron-star interior properties without relying on unverified EOS models.