Quantum Particle Creation by Cosmic Strings in de Sitter Spacetime

TL;DR

This paper investigates how cosmic strings in de Sitter spacetime influence particle creation, deriving solutions and calculating creation probabilities to understand the effects of string properties on quantum particle production in an expanding universe.

Contribution

It provides a detailed analysis of particle creation mechanisms caused by cosmic strings in de Sitter space, including exact solutions and the impact of string parameters on particle production rates.

Findings

String properties significantly affect particle creation rates.

Exact solutions are derived using hypergeometric functions.

Particle creation probabilities depend on string tension and angular deficits.

Abstract

This paper explores the phenomenon of particle creation associated with cosmic strings in de Sitter spacetime, a model that represents the universe exponential expansion. We examine how the presence of cosmic strings in a de Sitter background affects particle production, focusing on the roles of string tension and angular deficits. Utilizing the Klein Gordon equation adapted to curved spacetime with cosmic string defects, we derive solutions expressed through hypergeometric functions to describe particle states. Our findings highlight how string properties influence particle creation rates and energy distributions. By analyzing both point-like and linear potentials near the string, we determine exact solutions, investigate asymptotic behaviors, and calculate particle creation probabilities using Bogoliubov transformations.