Cosmological particle creation in the little bang

TL;DR

This paper investigates particle creation in an expanding quantum field model relevant to relativistic collisions, using a quasiparticle approach to analyze particle production from a boost-invariant expansion.

Contribution

It introduces a quasiparticle-based exact diagonalization method for a scalar quantum field in an expanding background, modeling particle production in relativistic collisions.

Findings

Quantifies particle production in a boost-invariant expansion

Demonstrates the effectiveness of quasiparticle diagonalization

Provides a reliable model for central rapidity region dynamics

Abstract

Particle production by expanding in the future light cone scalar quantum field is studied by assuming that the initial state is associated with the quasiequilibrium statistical operator corresponding to fluid dynamics. We calculate particle production from a longitudinally boost-invariant expanding quantum field designed as a simple but reliable model for the central rapidity region of a relativistic collision. Exact diagonalization of the model is performed by introducing a notion of quasiparticles.