Enhancement of particle creation in nonlinear resonant cavities

TL;DR

This paper demonstrates that nonlinear interactions in a resonant cavity can significantly increase the rate of particle creation, using quantum field theoretical techniques and a specific scalar field model.

Contribution

It introduces a novel analysis of nonlinear effects on particle creation in resonant cavities using the Schwinger-Keldysh diagrammatic approach.

Findings

Nonlinear interactions generate nonzero quantum averages.

Particle creation rate is significantly enhanced by nonlinear effects.

Analysis applied to a massless scalar field with quartic interaction.

Abstract

The rate of particle creation in a resonantly oscillating cavity is known to be approximately constant at large evolution times. Employing the Schwinger-Keldysh diagrammatic technique, we show that nonlinear interactions generate nonzero quantum averages and significantly enhance this rate. To illustrate this phenomenon, we consider a massless scalar field with a quartic interaction in a one-dimensional cavity with perfectly reflecting walls oscillating at twice the fundamental frequency.