The effects of delta mesons on the baryonic direct Urca processes in neutron star matter

TL;DR

This paper investigates how delta mesons influence neutrino emission processes in neutron star matter, revealing that they significantly enhance neutrino emissivity and potentially accelerate neutron star cooling.

Contribution

It introduces the effect of delta mesons within relativistic mean field theory on direct Urca processes in neutron star matter, highlighting their impact on neutrino emissivity.

Findings

Delta mesons increase neutrino emissivity in neutron star matter

Enhanced neutrino emission leads to faster cooling of neutron stars

The study emphasizes the role of isovector scalar interactions in dense matter

Abstract

In the framework of relativistic mean field theory, the relativistic neutrino emissivity of the nucleonic and hyperonic direct Urca processes in the degenerate baryon matter of neutron stars are studied. We investigate particularly the influence of the isovector scalar interaction which is considered by exchanging $\delta$ meson on the nucleonic and hyperonic direct Urca processes. The results indicate that $\delta$ mesons lead to obvious enhancement of the total neutrino emissivity, which must result in more rapid cooling rate of neutron star matter.