Weak Cosmic Censorship in Kerr-Sen Black Hole under Charged Scalar Field

TL;DR

This paper confirms that Kerr-Sen black holes cannot be over-spun or over-charged by charged scalar fields, supporting the validity of the weak cosmic censorship conjecture within string theory-inspired black hole solutions.

Contribution

It demonstrates the validity of the weak cosmic censorship conjecture for Kerr-Sen black holes through analysis of scalar field scattering and thermodynamic laws.

Findings

Extremal and near-extremal Kerr-Sen black holes cannot be over-spun or over-charged.

The weak cosmic censorship conjecture holds for Kerr-Sen black holes under scalar field interactions.

Results are consistent with the first, second, and third laws of thermodynamics.

Abstract

We investigate the weak cosmic censorship conjecture for Kerr-Sen black holes, which are solutions to the four-dimensional low-energy effective field theory for the heterotic string theory, based on the scattering of a charged scalar field. When the fluxes of the scalar field are assumed to transfer its conserved quantities to the black hole, extremal and near-extremal black holes cannot be over-spun and over-charged in their first-order variations, which is sufficient to conclude that the weak cosmic censorship conjecture is valid for Kerr-Sen black holes. We confirm our conclusion by relating it to the first, second, and third laws of thermodynamics.