89 citations · 774 across the 55 of their papers we have counts for
4 papers · 1 filter
Polychronic Tunneling: New Tunneling Processes Experiencing Euclidean and Lorentzian Evolution Simultaneously
Naritaka Oshita, Yutaro Shoji, Masahide Yamaguchi
We discuss new possible tunneling processes in the presence of gravity. We formulate quantum tunneling using the Wheeler-deWitt canonical quantization and the WKB approximation. Th…
On the ease of excitation of black hole ringing: Quantifying the importance of overtones by the excitation factors
Naritaka Oshita
The excitation factors of black hole quasinormal modes quantify the of the quasinormal modes and are independent of the source of perturbation. We com…
Black hole evaporation in de Sitter space
Ruth Gregory, Ian G. Moss, Naritaka Oshita +1
We investigate the evaporation process of a Kerr-de Sitter black hole with the Unruh-Hawking-like vacuum state, which is a realistic vacuum state modelling the evaporation process…
Lifshitz scaling, ringing black holes, and superradiance
Naritaka Oshita, Niayesh Afshordi, Shinji Mukohyama
We investigate the ringdown waveform and reflectivity of a Lifshitz scalar field around a fixed Schwarzschild black hole. The radial wave equation is modified due to the Lorentz br…