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Constraining the neutron star equation of state by including the isoscalar-vector and isovector-vector coupling using the Bayesian analysis

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arxiv 2505.02618 v1 pith:SWNF4344 submitted 2025-05-05 nucl-th astro-ph.HEhep-phhep-th

classification nucl-thastro-ph.HEhep-phhep-th
keywords stateequationequationscouplingisoscalar-vectorisovector-vectormatterneutron
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We constrain the nuclear matter equation of state within the relativistic mean field model by including the isoscalar-vector and isovector-vector coupling term at a fundamental level using the Bayesian analysis. We used the nuclear saturation properties and recent astrophysical observations to constrain the dense matter equation of state. We obtained about 20000 sets of equations of states out of sampling about 60 millions sets of equations of states. All 20000 equations of states satisfy nuclear matter saturation properties at saturation densities and produces high mass neutron stars. In our findings, we find that the non-zero value of isoscalar-vector and isovector-vector coupling parameter and negative value of sigma meson self-coupling stiffen the equation of state. Our sets of equations of state produces neutron stars of mass larger than 2.5 M$_{\odot}$ to include the recent gravitational waves observation GW190419.

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  1. Constraints on maximum neutron star mass from proto-neutron star evolution

    nucl-th 2025-05 conditional novelty 5.0 of 10

    Hyperonic neutron stars are inferred to cap at roughly 2.15 to 2.2 solar masses, while stars above 2.2 solar masses should have purely nucleonic cores.

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