Crossover transition in bag-like models

TL;DR

This paper introduces a simplified model for a gas of extended hadrons that reproduces a crossover transition similar to lattice QCD, showing how high-temperature behavior aligns with an ideal quark-gluon gas.

Contribution

It presents a new simple model inspired by the compressible bag model that captures the crossover transition in hadronic matter.

Findings

Reproduces a crossover transition similar to lattice QCD

At high temperature, system behaves as an ideal quark-gluon gas

Finite extended bags dominate at high temperature

Abstract

We formulate a simple model for a gas of extended hadrons at zero chemical potential by taking inspiration from the compressible bag model. We show that a crossover transition qualitatively similar to lattice QCD can be reproduced by such a system by including some appropriate additional dynamics. Under certain conditions, at high temperature, the system consist of a finite number of infinitely extended bags, which occupy the entire space. In this situation the system behaves as an ideal gas of quarks and gluons.