Unveiling the correlations of tidal deformability with the nuclear symmetry energy parameters

TL;DR

This paper uses a covariance approach to analyze how neutron star tidal deformability correlates with nuclear symmetry energy parameters, revealing the importance of NMP correlations derived from fit data.

Contribution

It introduces a covariance method to study correlations between neutron star properties and nuclear matter parameters, emphasizing the role of NMP correlations from fit data.

Findings

Strong correlation between tidal deformability and symmetry energy slope and curvature.

NMP correlations from fit data significantly enhance the tidal deformability correlations.

Interplay between isoscalar and isovector NMPs influences the results.

Abstract

The chi-squared based covariance approach allows one to estimate the correlations among desired observables related to nuclear matter directly from a set of fit data without taking recourse to the distributions of the nuclear matter parameters (NMPs). Such an approach is applied to study the correlations of tidal deformability of neutron star with the slope and the curvature parameters of nuclear symmetry energy governed by an extensive set of fit data on the finite nuclei together with the maximum mass of the neutron star. The knowledge of the distributions of NMPs consistent with the fit data is implicitly inbuilt in the Hessian matrix which is central to this covariance approach. Comparing our results with those obtained with the explicit use of the distributions of NMPs, we show that the appropriate correlations among NMPs as induced by the fit data are instrumental in strengthening the correlations of the tidal deformability with the symmetry energy parameters, without it, the said correlations tend to disappear. The interplay between isoscalar and isovector NMPs is also emphasized.