Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

The purpose of this study is to investigate the new dark matter candidates and their production mechanisms. In this study, we concentrated on the dark matter production by analyzing the topology change. Our results revealed the variety of the dark matter productions. © 2013 World Scientific Publishing Company.

DOI： 10.1142/s0219887812500958

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

The purpose of this study is to examine the effect of topology change in the initial universe. In this study, the concept of G-cobordism is introduced to argue about the topology change of the manifold on which a transformation group acts. This G-manifold has a fiber bundle structure if the group action is free and is related to the spacetime in Kaluza-Klein theory or Einstein-Yang-Mills system. Our results revealed the fundamental processes of compactification in G-manifolds. In these processes, the initial high symmetry and multidimensional universe changes to present universe by the mechanism which lowers the dimensions and symmetries.

DOI： 10.1142/s0219887811005622

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

This communication concerns the geometric effect on magnetic properties of superconductors. The metric description for quantum particles holds only in limited class of medium and the screw-dislocated medium is considered. When the Ginzburg-Landau equation with Maxwell's equations was solved based on this description, it was shown that self-adjointness of the operator is guaranteed by specified solutions. As a result, isolated vortex exists at dislocation line. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physleta.2011.06.032

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

Black hole evaporation process is analyzed with thermo field dynamics. The major finding is an example of the black hole evaporation which involves one-mode squeezed state. © 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/s0370-2693(01)00941-8

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

Geometrical aspect of pinning in superconducting material is studied. The major finding is that pinning is caused by geometry of topological defect such as disclination in superconducting material. (C) 2000 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/s0375-9601(00)00716-7

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press ({OUP})  

DOI： 10.1143/ptp.104.505

Web of Science