:Global Type
:Tenure-track Type
Research Interests: gravity, cosmology, astrophysics (Theory)
Research Topic: Theoretical aspects of a black hole ringing: Probing extreme gravity with ringing black holes
Host Department: Yukawa Institute for Theoretical Physics
Previous Affiliation: RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)
Black holes are perhaps the most mysterious objects in the Universe. They have extreme gravity as even light cannot escape from the black hole interior, which is a famous feature of black holes. Another noteworthy nature of the black holes is its “simplicity”. For example, to precisely characterize the earth, many parameters and information are needed: the mass, spin, distribution of the interior temperature, number of sand particles, how bumpy the surface is, and so on. On the other hand, a black hole is one of the simplest objects in the Universe as only the mass and spin of the black hole, i.e., two parameters only, can completely characterize the structure of the astrophysical black hole in Einstein’s general relativity, the standard theory of gravity. This simplicity and universality of black holes are useful to probe gravity in strong gravity regimes. Although we know general relativity succeeded to explain various phenomena in weak gravity regimes, it is still unknown if the theory is valid even in strong gravity regimes, e.g., in the vicinity of the black holes or at the beginning of the Universe. I aim to develop a novel way to probe extreme gravity by studying the universal nature of a black hole ringing and by predicting the gravitational wave signals sourced by the black holes under the Hakubi project.
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