91 citations · 671 across the 35 of their papers we have counts for
36 papers
Hairy black holes in AdS with Robin boundary conditions
Tomohiro Harada, Takaaki Ishii, Takuya Katagiri +1
We study hairy black holes in Einstein-Maxwell-complex scalar theory in four-dimensional asymptotically global anti-de Sitter (AdS) spacetime when the Robin boundary conditions are…
Superradiance and black resonator strings encounter helical black strings
Oscar J. C. Dias, Takaaki Ishii, Keiju Murata +2
We construct a cohomogeneity-1 helical black string in six-dimensional Einstein gravity. The helical solution branches from the onset of the gravitational superradiant instability…
Gregory-Laflamme and Superradiance encounter Black Resonator Strings
Oscar J. C. Dias, Takaaki Ishii, Keiju Murata +2
We construct novel black strings that are neither time-translation invariant, nor axisymmetric, nor translationally invariant in the string direction, but nevertheless have a helic…
Gregory-Laflamme encounters Superradiance
Oscar J. C. Dias, Takaaki Ishii, Keiju Murata +2
We investigate the effect of superradiant scattering of gravitational perturbations on the stability of rotating black strings, focusing on the six dimensional equal-spinning Myers…
Energy extraction from AdS black holes via superradiance
Takaaki Ishii, Youka Kaku, Keiju Murata
Superradiance is known as a wave amplification process caused by rotating or charged black holes. We argue that the superradiance of stationary black holes in asymptotically AdS sp…
Chaotic string dynamics in deformed
Takaaki Ishii, Shodai Kushiro, Kentaroh Yoshida
Recently, Arutyunov, Bassi and Lacroix have shown that 2D non-linear sigma model with a deformed background is classically integrable [arXiv:2010.05573 [hep-th]]. This ba…