Tidal Deformation and Dissipation of Rotating Black Holes
APA
Chia, H.S. (2021). Tidal Deformation and Dissipation of Rotating Black Holes. Perimeter Institute. https://pirsa.org/21060078
MLA
Chia, Horng Sheng. Tidal Deformation and Dissipation of Rotating Black Holes. Perimeter Institute, Jun. 11, 2021, https://pirsa.org/21060078
BibTex
@misc{ pirsa_PIRSA:21060078, doi = {10.48660/21060078}, url = {https://pirsa.org/21060078}, author = {Chia, Horng Sheng}, keywords = {Other}, language = {en}, title = {Tidal Deformation and Dissipation of Rotating Black Holes}, publisher = {Perimeter Institute}, year = {2021}, month = {jun}, note = {PIRSA:21060078 see, \url{https://pirsa.org}} }
University of Amsterdam
Talk Type
Subject
Abstract
Black holes are never isolated in realistic astrophysical environments; instead, they are often perturbed by complicated external tidal fields. How does a black hole respond to these tidal perturbations? In this talk, I will discuss both the conservative and dissipative responses of the Kerr black hole to a weak and adiabatic gravitational field. The former describes how the black hole would change its shape due to these tidal interactions, and is quantified by the so-called “Love numbers”. On the other hand, the latter describes how energy and angular momentum are exchanged between the black hole and its tidal environment due to the absorptive nature of the event horizon. In this talk, I will describe how the Love numbers of the Kerr black hole in a static tidal field vanish identically. I will also describe how the Kerr black hole's dissipative response implies that energy and angular momentum can either be lost to or extracted from the black hole, with the latter process commonly known as the black hole superradiance. I will end by discussing how these tidal responses leave distinct imprints on the gravitational waves emitted by binary black holes.