Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Sousuke Noda"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 11, Pp 1-14 (2024)
Abstract In this paper, our aim is to extend our earlier work [Ahmed et al. in Eur. Phys. J. C 76:280, 2016], investigating an axisymmetric plasma flow with angular momentum onto a spherical black hole. To accomplish that goal, we focus on the case i
Externí odkaz:
https://doaj.org/article/937e4f255b1c43dd9940b7bfa036881a
Autor:
Sousuke Noda, Hayato Motohashi
Publikováno v:
Physical Review D. 106
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee86cc460917cd7c5fa6abcf34cd81fe
https://doi.org/10.1103/physrevd.106.064025
https://doi.org/10.1103/physrevd.106.064025
Publikováno v:
Physical Review D. 105
We explore superradiance for Alfv\'en waves (Alfv\'enic superradiance) in an axisymmetric rotating magnetosphere of a Kerr black hole within the force-free approximation. On the equatorial plane of the Kerr spacetime, the Alfv\'en wave equation is re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80bc3041826492451ad3472074f65d79
https://doi.org/10.1103/physrevd.105.064018
https://doi.org/10.1103/physrevd.105.064018
Autor:
Sousuke Noda, Hayato Motohashi
Publikováno v:
Progress of Theoretical and Experimental Physics. 2022
We establish an exact formulation for wave scattering of a massless field with spin and charge by a Kerr-Newman-de Sitter black hole. Our formulation is based on the exact solution of the Teukolsky equation in terms of the local Heun function, and do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57a4b9f9c37fd697fbb18e3f1d93b83c
https://doi.org/10.1093/ptep/ptac020
https://doi.org/10.1093/ptep/ptac020
We compute the graybody factor and evaporation rate of a rotating black hole in the presence of a hypothetical reflective surface slightly outside the outer horizon radius, assuming that it spontaneously emits thermal radiation due to quantum-gravita
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ef82128890cc608a89e20badf777f851
Autor:
Sousuke Noda, Yen Chin Ong
Publikováno v:
Physical Review D. 103
Recently it was discovered that null hypersurfaces can develop caustics outside the event horizon of super-entropic Kerr-AdS black holes, in contrast to the usual Kerr-AdS case. In this work we explore a few more examples of black hole spacetimes in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3a18d8185e490bcb66d380f829f5208
https://doi.org/10.1103/physrevd.103.024053
https://doi.org/10.1103/physrevd.103.024053
Autor:
Yasusada Nambu, Sousuke Noda
Publikováno v:
Physical Review D. 105(4):045022
We investigate the wave optical imaging of black holes with Hawking radiation. The spatial correlation function of Hawking radiation is expressed in terms of transmission and reflection coefficients for scalar wave modes and evaluated by numerically
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::801803b91159d36b8f8db83ecb88f1d1
https://nagoya.repo.nii.ac.jp/records/2003117
https://nagoya.repo.nii.ac.jp/records/2003117
The superradiant scattering of Alfv\'en waves (Alfv\'enic superradiance) in a forcefree magnetosphere is discussed to reveal the relationship between the Blandford-Znajek (BZ) process and superradiance. For simplicity, we consider a four-dimensional
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1e0557b7148719706019da2e30150e7
http://arxiv.org/abs/1909.04795
http://arxiv.org/abs/1909.04795
We investigate the wave optics in spherically symmetric spacetimes: Schwarzschild black hole, spherical star with a perfect absorbing surface, and massless/massive Ellis wormholes. Assuming a point wave source, wave pattern and power spectrums for sc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64462bc6445b4813a86e8c702aac3855
http://arxiv.org/abs/1905.01793
http://arxiv.org/abs/1905.01793
Publikováno v:
Physical Review D. 95
We present a model of the analog geometry in a magnetohydrodynamic (MHD) flow. For the MHD flow with magnetic pressure-dominated and gas pressure-dominated conditions, we obtain the magnetoacoustic metric for the fast MHD mode. For the slow MHD mode,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::374e7238b12c025b7f7eef822eb7aaab
https://doi.org/10.1103/physrevd.95.104055
https://doi.org/10.1103/physrevd.95.104055