A Parametrized Equation of State for Neutron Star Matter with Continuous Sound Speed

TL;DR

This paper introduces a new parametrization for neutron star equations of state that ensures continuity in pressure, energy density, and sound speed, improving modeling accuracy and numerical simulations.

Contribution

It develops a generalized piecewise polytropic model with continuous sound speed, enhancing the accuracy of astrophysical predictions and numerical relativity simulations.

Findings

Accurately reproduces mass, radius, and tidal deformability

Identifies preferred dividing densities for EOS modeling

Improves convergence in neutron star simulations

Abstract

We present a generalized piecewise polytropic parameterization for the neutron-star equation of state using an ansatz that imposes continuity in not only pressure and energy density, but also in the speed of sound. The universe of candidate equations of state is shown to admit preferred dividing densities, determined by minimizing an error norm consisting of integral astrophysical observables. Generalized piecewise polytropes accurately reproduce astrophysical observables, such as mass, radius, tidal deformability and mode frequencies, as well as thermodynamic quantities, such as the adiabatic index. This makes the new EOS useful for Bayesian parameter estimation from gravitational waveforms. Moreover, since they are differentiable, generalized piecewise polytropes can improve pointwise convergence in numerical relativity simulations of neutron stars. Existing implementations of piecewise polytropes can easily accommodate this generalization.