Causal Structure of an Inflating Magnetic Monopole

TL;DR

This paper analyzes the causal structure of an inflating magnetic monopole, demonstrating it avoids the graceful exit problem and exhibits eternal inflation, while also discussing broader inflationary spacetime properties.

Contribution

It provides a detailed causal analysis of inflating magnetic monopoles and clarifies their behavior within inflationary cosmology.

Findings

The inflating monopole model is free from the graceful exit problem.

The monopole undergoes eternal inflation.

Discussion of general properties of inflationary spacetimes.

Abstract

We clarify the causal structure of an inflating magnetic monopole. The spacetime diagram shows explicitly that this model is free from ``graceful exit'' problem, while the monopole itself undergoes ``eternal inflation''. We also discuss general nature of inflationary spacetimes.