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- The University of TokyoJP492 papers
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7 papers · 2 filters
Uniqueness of static spherically symmetric vacuum solutions in the IR limit of Hořava-Lifshitz gravity
Tomohiro Harada, Umpei Miyamoto, Naoki Tsukamoto
We investigate static spherically symmetric vacuum solutions in the IR limit of projectable nonrelativistic quantum gravity, including the renormalisable quantum gravity recently p…
Accretion process onto super-spinning objects
Cosimo Bambi, Katherine Freese, Tomohiro Harada +2
The accretion process onto spinning objects in Kerr spacetimes is studied with numerical simulations. Our results show that accretion onto compact objects with Kerr parameter (char…
Observational constraints of a power spectrum from super-inflation in Loop Quantum Cosmology
Masahiro Shimano, Tomohiro Harada
In loop quantum cosmology there may be a super-inflation phase in the very early universe, in which a single scalar field with a negative power-law potential plays…
Collapse of differentially rotating supermassive stars: Post black hole formation
Motoyuki Saijo, Ian Hawke
We investigate the collapse of differentially rotating supermassive stars (SMSs) by means of 3+1 hydrodynamic simulations in general relativity. We particularly focus on the onset…
Relativistic Gravitational Collapse of a Cylindrical Shell of Dust II: Settling Down Boundary Condition
Ken-ichi Nakao, Tomohiro Harada, Yasunari Kurita +1
We numerically study the dynamics of an imploding hollow cylinder composed of dust. Since there is no cylindrical black hole in 4-dimensional spacetime with physically reasonable e…
Cosmological wormholes
Hideki Maeda, Tomohiro Harada, B. J. Carr
Motivated by the cosmological wormhole solutions obtained from our recent numerical investigations, we provide a definition of a wormhole which applies to dynamical situations. Our…