Black hole pair production on cosmic strings in the presence of a background magnetic field

TL;DR

This paper studies the creation of magnetically charged black holes on cosmic strings within magnetic fields, revealing how string breaking and magnetic field strength influence black hole production rates.

Contribution

It introduces a detailed analysis of black hole pair creation on cosmic strings in magnetic fields, including effects of string breaking and comparison with monopole pair production.

Findings

Large magnetic fields increase black hole production.

String breaking enhances pair creation rates.

Positive cosmological constant also boosts production.

Abstract

We investigate the pair creation of magnetically charged black holes on a cosmic string in the presence of a background magnetic field. The string may either break or fray to produce a pair of accelerating black holes described by Ernst metric. By using the instanton action we obtain the rate of such production. For large values of background magnetic field the production of large black holes is probable. Comparing our results with the case of black hole pair creation in magnetic field with no string, we show that fraying/breaking of the cosmic string can substantially enhance the production rate. We also obtain the result of monopole-antimonopole pair production on cosmic string in an external magnetic field, using the WKB approximation and compare it with the black hole results. We also provide a heuristic study of black hole pair creation on cosmic string in the presence of a magnetic field in the de Sitter background, although the analog of Ernst metric with a cosmological constant is lacking. Like a cosmic string and/or a background magnetic field, a positive cosmological constant increases the production rate.