Special Postdoctoral Researcher, RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)
Dr. Naritaka Oshita
- Research Fields
- Quantum/Classical Gravity, Cosmology, Quantum Field Theory
- Term and History
- 2021-04-01 - Special Postdoctoral Researcher
I am a theoretical physicist who works on gravity, cosmology, and quantum field theory. Quantum fluctuations of mater/gravitational fields in an expanding universe or a black hole exhibit thermal radiation and superradiance. These phenomena are important to understand the thermal nature of the gravitational systems and how information of matter is encoded there. Also, the classical linear perturbations of a black hole are characterized by the quasinormal modes of the black hole. This is useful to test classical/quantum gravity theories by the observation of gravitational waves.
Beyond the linear perturbation in gravitational systems, I am also working on non-perturbative phenomena of quantum fields such as vacuum decay in strong gravity. The standard model of particle physics predicts that the Higgs field is metastable, which means that our Universe might eventually undergo a catastrophic vacuum decay and be filled with negative vacuum energy. The vacuum decay process is therefore important to understand the history and fate of the Universe.
iTHEMS NOW & NEXT FY2022
March 29 (Wed) at 9:30 - 15:45, 2023 Others
RIKEN Day: Let's Talk with Researchers! "Listening to the Ringing of a Black Hole"
February 25 (Fri) at 18:00 - 18:30, 2022 External Event
iTHEMS-phys Intro Meeting on May 31, 2021
May 31 (Mon) at 13:00 - 15:00, 2021 Seminar iTHEMS Theoretical Physics Seminar
Farewell message from Dr. Naritaka Oshita
2023-03-15 Hot Topic
Become a scientist who studies what you love !! [Chapter of Universe]
Naritaka Oshita presented his talk at the 12th Koshien of Science (Oita tournament) on November 3, 2022
2022-11-10 Hot Topic
Dr. Naritaka Oshita received the "17th Seitaro Nakamura Prize"
RIKEN Research: Ringing black holes could put general relativity to the test
2022-04-08 Research News
Universal chords played by black holes - Toward the verification of general relativity by black hole fluctuations
2021-12-15 Press Release
Self-introduction: Naritaka Oshita
2021-05-17 Person of the Week