MS. SWETHA BHAGWAT

When two black holes merge, they 'ringdown' as they settle into a final Kerr black hole. The ringdown part of the gravitational wave signal probes the strong field gravity, enabling us to test the general theory of relativity (GR) in that regime. In this talk, the speaker will summarize prospects to perform GR tests with the ringdown signals using the current and future ground-based gravitational wave observatory. She will also introduce the challenges faced in the data analysis of these signals and review its current status. Then, she will focus on a particular problem with these signals - estimating the start time of the ringdown. She will discuss this, both from the point of view of the dynamics observed in the source frame and the analysis on gravitational wave done in the asymptotic frame.