New Insights into Kerr-Sen Black Holes: Stability Against Overspinning and Overcharging

Recent research by Koray Düztaş, titled "Self energy in Kerr-Sen space-time incorporated to overspinning and overcharging problems," addresses significant issues in the study of Kerr-Sen black holes. The paper, submitted on August 25, 2024, re-evaluates the overspinning and overcharging problems that can lead to naked singularities in these black holes. Previous studies had suggested that Kerr-Sen black holes could be overcharged or overspun without considering backreaction effects.

Düztaş's work incorporates the self-energy of perturbations, which arise from increases in angular velocity and electrostatic potential at the event horizon. The findings indicate that Kerr-Sen black holes cannot be overspun or overcharged by perturbations that satisfy the null energy condition when a complete second-order analysis is applied. This analysis includes the self-energy of the perturbations, which is crucial for understanding the stability of these black holes.

The implications of this research are significant for theoretical physics, particularly in the field of general relativity and quantum cosmology. By clarifying the conditions under which Kerr-Sen black holes can exist without leading to singularities, this study contributes to the broader understanding of black hole physics and the fundamental laws governing these cosmic entities.

For further details, the paper can be accessed at arXiv:2408.13947.