Effects of Induced Surface Tension in Nuclear and Hadron Matter

TL;DR

This paper introduces a new equation of state for nuclear and hadron matter that incorporates induced surface tension effects from hard-core particle repulsion, improving the modeling of dense matter.

Contribution

It presents a novel equation of state including surface tension effects from hard-core repulsion, applicable to nuclear physics and astrophysics.

Findings

Surface tension effects are explicitly modeled in the equation of state.

The model transitions from surface tension to volume dominance at high densities.

Applications include describing hadronic multiplicities and neutron star interiors.

Abstract

Short range particle repulsion is rather important property of the hadronic and nuclear matter equations of state. We present a novel equation of state which is based on the virial expansion for the multicomponent mixtures with hard-core repulsion. In addition to the hard-core repulsion taken into account by the proper volumes of particles, this equation of state explicitly contains the surface tension which is induced by another part of the hard-core repulsion between particles. At high densities the induced surface tension vanishes and the excluded volume treatment of hard-core repulsion is switched to its proper volume treatment. Possible applications of this equation of state to a description of hadronic multiplicities measured in A+A collisions, to an investigation of the nuclear matter phase diagram properties and to the neutron star interior modeling are discussed.