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7 papers · 2 filters
Naked singularity explosion in higher-dimensional dust collapse
Masahiro Shimano, Umpei Miyamoto
In the context of the large extra dimensions or TeV-scale gravity, it has been argued that an effective naked singularity, called the visible border of spacetime, would be generate…
Can a black hole with conformal scalar hair rotate?
Sourav Bhattacharya, Hideki Maeda
It is shown that, under the separability assumption for the metric, the slow-rotation approximation for the Bocharova-Bronnikov-Melnikov-Bekenstein black hole in general relativity…
High Energy Collision of Particles in the Vicinity of Extremal Black Holes in Higher Dimensions: Banados-Silk-West Process as Linear Instability of Extremal Black Holes
Naoki Tsukamoto, Masashi Kimura, Tomohiro Harada
We study high energy particle collisions around the higher dimensional black holes. It is shown that the center of mass energy can be arbitrarily large in the vicinity of the event…
Identifying the most crucial parameters of the initial curvature profile for primordial black hole formation
Tomohiro Nakama, Tomohiro Harada, A. G. Polnarev +1
Primordial black holes (PBHs) are an important tool in cosmology to probe the primordial spectrum of small-scale curvature perturbations that reenter the cosmological horizon durin…
Renormalization group approach to Einstein-Rosen waves
Tomohiro Harada, Sanjay Jhingan
We present a renormalization group analysis to Einstein-Rosen waves or vacuum spacetimes with whole-cylinder symmetry. It is found that self-similar solutions appear as fixed point…
Wave Effect in Gravitational Lensing by the Ellis Wormhole
Chul-Moon Yoo, Tomohiro Harada, Naoki Tsukamoto
We propose the use of modulated spectra of astronomical sources due to gravitational lensing to probe Ellis wormholes. The modulation factor due to gravitational lensing by the Ell…