Naritaka Oshita

Research Interests

I am interested in the quantum cosmology, quantum black holes, gravitational waves, and vacuum decay in strong gravity.

Positions Held

• 2014-2019 Department of Physics, University of Tokyo, Ph.D. student, Advisor: Prof. Jun'ichi Yokoyama
• 2011-2014 Department of Physical Science, Hiroshima University, B.Sc. student, Advisor: Prof. Kazuhiro Yamamoto

Recent Publications

• Ruth Gregory, Ian G. Moss, Naritaka Oshita, and Sam Patrick, ``Hawking-Moss transition with a black hole seed", JHEP 09 (2020) 135, arXiv: 2007.11428 [hep-th].
• Takumi Hayashi, Kohei Kamada, Naritaka Oshita, Jun'ichi Yokoyama, ``On catalyzed vacuum decay around a radiating black hole and the crisis of the electroweak vacuum", accepted for publication in JHEP, arXiv: 2005.12808 [hep-th].
• Ruth Gregory, Ian G. Moss, and Naritaka Oshita, ``Black Holes, Oscillating Instantons, and the Hawking-Moss transition", JHEP 07 (2020) 024, arXiv: 2003.04927 [hep-th].
• Naritaka Oshita, Daichi Tsuna, and Niayesh Afshordi, ``Quantum Black hole Seismology II: Applications to Astrophysical Black Holes", Phys. Rev. D 102, 024046 (2020), arXiv: 2004.06276 [gr-qc].
• Naritaka Oshita, Daichi Tsuna, Niayesh Afshordi, "Quantum Black Hole Seismology I: Echoes, Ergospheres, and Spectra", Phys. Rev. D 102, 024045 (2020), arXiv: 2001.11642 [gr-qc].
• Naritaka Oshita, Qingwen Wang, and Niayesh Afshordi, "On Reflectivity of Quantum Black Hole Horizons", JCAP 04 (2020) 016, arXiv: 1905.00464 [hep-th].
• Naritaka Oshita, "Small-mass naked singularities censored by the Higgs field", Class. Quantum Grav. 37 (2020) 07LT01, arXiv: 2002.11175 [hep-th].
• Jahed Abedi, Niayesh Afshordi, Naritaka Oshita, Qingwen Wang, "Quantum Black Holes in the Sky", Universe 2020, 6(3), 43, arXiv: 2001.09553 [gr-qc].
• Qingwen Wang, Naritaka Oshita, and Niayesh Afshordi, "Echoes from Quantum Black Holes", Phys. Rev. D 101, 024031 (2020), arXiv: 1905.00446 [gr-qc].
• Naritaka Oshita, Kazushige Ueda, Masahide Yamaguchi, "Vacuum decays around spinning black holes", JHEP 01 (2020) 015, arXiv: 1909.01378 [hep-th].
• Naritaka Oshita, Masaki Yamada, and Masahide Yamaguchi, "Compact objects as the catalysts for vacuum decays", Phys. Lett. B 791 (2019) 149-155, arXiv: 1808.01382 [gr-qc].
• Naritaka Oshita and Niayesh Afshordi, "Probing microstructure of black hole spacetimes with gravitational wave echoes", Phys. Rev. D 99, 044002 (2019), arXiv: 1807.10287 [gr-qc].
• Naritaka Oshita, "Generalized second law of thermodynamics and cosmological decoherence", Phys.Rev. D97 no.2, 023510 (2018), arXiv: 1709.08807 [gr-qc].
• Naritaka Oshita and Yi-Peng Wu, "Role of spacetime boundaries in Einstein's other gravity", Phys.Rev. D 96 no.4, 044042 (2017), arXiv: 1705.10436 [gr-qc].
• Satoshi Iso, Naritaka Oshita, Rumi Tatsukawa, Kazuhiro Yamamoto and Sen Zhang, "Quantum radiation produced by the entanglement of quantum fields", Phys. Rev. D 95, no. 2, 023512 (2017), arXiv: 1610.08158 [hep-th].
• Naritaka Oshita, "The black hole information paradox and highly squeezed interior quantum fluctuations", Class. Quant. Grav. 34, no. 19, 195002 (2017), arXiv: 1607.06546 [hep-th].
• Naritaka Oshita and Jun'ichi Yokoyama, "Entropic interpretation of the Hawking-Moss bounce", PTEP 2016, no. 5, 053E02 (2016), arXiv: 1603.06671 [hep-th].
• Naritaka Oshita and Jun'ichi Yokoyama, "Creation of an inflationary universe out of a black hole", Phys. Lett. B 785, 197 (2018), arXiv: 1601.03929 [gr-qc].
• Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang, "Quantum radiation produced by a uniformly accelerating charged particle in thermal random motion", Phys. Rev. D 93, no. 8, 085016 (2016), arXiv: 1509.03038 [hep-th].
• Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang, "Quantum radiation from a particle in an accelerated motion coupled to vacuum fluctuations", Phys. Rev. D 92, no. 4, 045027 (2015), arXiv: 1508.06338 [hep-th].
• Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang, "Thermal property in Brownian motion of a particle coupled to vacuum fluctuations", Phys. Rev. D 89, no. 12, 124028 (2014), arXiv: 1403.5028 [gr-qc].
• Naritaka Oshita and Jun'ichi Yokoyama, "Creation of an inflationary universe out of black hole space-time", Int.J.Mod.Phys. A33 (2018) no.31, 1844005.
• CosPA 2015, Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang, "Unruh radiation produced by a uniformly accelerating charged particle in thermal random motions", arXiv: 1604.04061 [hep-th].