33 citations · 48 across the 6 of their papers we have counts for
6 papers
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…
Naked Singularity Explosion in Higher Dimensions
Umpei Miyamoto, Hiroya Nemoto, Masahiro Shimano
Motivated by the recent argument that in the TeV-scale gravity trans-Planckian domains of spacetime as effective naked singularities would be generated by high-energy particle (and…
A trapped surface in the higher-dimensional self-similar Vaidya spacetime
Masahiro Shimano, Tomohiro Harada, Naoki Tsukamoto
We investigate a trapped surface and naked singularity in a -dimensional Vaidya spacetime with a self-similar mass function. A trapped surface is defined as a closed spacelike $…
Particle Creation by Naked Singularities in Higher Dimensions
Umpei Miyamoto, Hiroya Nemoto, Masahiro Shimano
Recently, the possibility was pointed out by one of the present authors and his collaborators that an effective naked singularity referred to as "a visible border of spacetime" is…
Discretisation parameter and operator ordering in loop quantum cosmology with the cosmological constant
Tomo Tanaka, Fumitoshi Amemiya, Masahiro Shimano +2
In loop quantum cosmology, the Hamiltonian reduces to a finite difference operator. We study the initial singularity and the large volume limit against the ambiguities in the discr…
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…