Complex effective actions and gravitational pair creation

TL;DR

This paper investigates the imaginary part of the gravitational effective action caused by a massless scalar field, comparing perturbative and non-perturbative methods, and relating to recent results in the field.

Contribution

It introduces a comparative analysis of different calculation methods for gravitational effective actions, highlighting new insights into gravitational pair creation phenomena.

Findings

Different methods yield consistent imaginary parts of the effective action.

Perturbative and non-perturbative approaches are contrasted and analyzed.

Results relate to recent findings in gravitational pair creation research.

Abstract

We use different methods to calculate the imaginary part of the gravitational effective action due to a massless scalar field, with a view on perturbative vs. non-pertubative and the results of ArXiv:2305.18521.