Speaker
Dr.
Kei Yamada
(Kyoto Universiry)
Description
The first detection of gravitational waves (GWs) from merger of binary black hole (BH) by advanced LIGO has opened a new window to test general relativity. In the future, extreme-mass-ratio inspirals (EMRIs), in which stellar-mass compact objects of mass $\mu$ spiral into a supermassive black holes (SMBHs) of mass $M$, are expected to be observed by LISA. Such systems can be expressed by using the BH perturbation approach, where we expand equations in the mass ratio $\mu/M$. In order to extract physical parameters from GW observations, the second-order perturbations must be considered. However, naive calculations lead to a divergence of the second-order perturbations around boundaries. In this talk, we will seek a counterterm to avoid such a divergence around the event horizon of the SMBH.
Primary author
Dr.
Kei Yamada
(Kyoto Universiry)
Co-authors
Dr.
Adam Pound
(Southampton University)
Prof.
Takahiro Tanaka
(Kyoto University)
