Cosmological particle creation in a hadronic fluid

TL;DR

This paper explores how massless pions in an expanding hadronic fluid can be modeled as particles in a curved spacetime, analyzing their creation spectrum analogous to cosmological and Hawking radiation phenomena.

Contribution

It introduces a novel analog gravity model for pions in a hadronic fluid and compares their cosmological particle creation spectrum with analog Hawking radiation.

Findings

Pions behave as massless particles in a hyperbolic FRW spacetime

The particle creation spectrum resembles cosmological particle production

Comparison with analog Hawking radiation reveals similar spectral features

Abstract

Acoustic perturbations in an expanding hadronic fluid at temperatures below the chiral transition point represent massless pions propagating in curved spacetime geometry. In comoving coordinates the corresponding analog metric tensor describes a hyperbolic FRW spacetime. We study the analog cosmological particle creation of pions below the critical point of the chiral phase transition. We compare the cosmological creation spectrum with the spectrum of analog Hawking radiation at the analog trapping horizon.