Merger estimates for Kerr-Sen black holes

Understand

The advent of gravitational wave observation starts a new era of precision tests of gravitational theory.

• Estimations of black holes mergers should come from any well established gravitational theories, provided that the theory has not been ruled out by observations.
• In this paper we consider the low energy limit of heterotic string theory where the associated rotating and charged black holes are described by the Kerr-Sen solution.
• We investigate the approximate final spins and quasinormal modes of the black hole resulting from the merger process.