13 citations · 22 across the 4 of their papers we have counts for
7 papers
Reconstruction of ringdown with excitation factors
Naritaka Oshita, Vitor Cardoso
In black hole perturbation formalism, the gravitational waveform is obtained by the convolution of the Green's function and the source term causing radiation emission. Hence, the r…
Slowly decaying ringdown of a rapidly spinning black hole II: Inferring the masses and spins of supermassive black holes with LISA
Daiki Watarai, Naritaka Oshita, Daichi Tsuna
Electromagnetic observations reveal that almost all galaxies have supermassive black holes (SMBHs) at their centers, but their properties, especially their spins, are not fully und…
Greybody Factors Imprinted on Black Hole Ringdowns: an alternative to superposed quasi-normal modes
Naritaka Oshita
It is shown that the spectral amplitude of gravitational-wave (GW) ringdown of a Kerr black hole sourced by an extreme mass ratio merger can be modeled by the $\textit{greybody fac…
Is the Coleman de Luccia action minimum?: AdS/CFT approach
Naritaka Oshita, Yutaro Shoji, Masahide Yamaguchi
We use the anti-de Sitter/conformal field theory (AdS/CFT) correspondence to find the least bounce action in an AdS false vacuum state, i.e., the most probable decay process of the…
From Entropy to Echoes: Counting the quasi-normal modes and the quantum limit of silence
Naritaka Oshita, Niayesh Afshordi
We estimate the canonical entropy of a quantum black hole by counting its quasi-normal modes. We first show that the partition function of a classical black hole, evaluated by coun…
Quantum radiation produced by the entanglement of quantum fields
Satoshi Iso, Naritaka Oshita, Rumi Tatsukawa +2
We investigate the quantum radiation produced by an Unruh-De Witt detector in a uniformly accelerating motion coupled to the vacuum fluctuations. Quantum radiation is nonvanishing,…