arXiv subjects

Kouichirou Hirata

Publications and source records attributed to Kouichirou Hirata.

2 recordsLinked to original sources

arXiv1996

Higher Dimensional Self-similar Spherical Symmetric Scalar Field Collapse and Critical Phenomena in Black Hole Formation

The higher dimensional spherical symmetric scalar field collapse problem is studied in the light of the critical behavior in black hole formation. To make the analysis tractable, the self similarity is also imposed. By giving a new view to the self-similar scalar field collapse problem, we give the general formula for the critical exponents in higher dimensions. In the process, the explanation of the universality of the critical phenomena is given within the self-similar context.

gr-qc↗

arXiv1996

Comment on Entropy in Two-dimensional Dilaton Gravity

The thermodynamic second law in the evaporating black hole space-time is examined in the context of two-dimensional dilaton black hole. The dynamical evolution of entropy is investigated by using the analytical perturbation method and the numerical method. It is shown that the thermodynamic second law holds in the vicinity of infalling shell %analytically and in the region far from the infalling shell %numerically in the case of semi-classical CGHS model. The analysis of the general models is also presented and its implication is discussed.

gr-qc↗