One of the most important problems in particle physics is to construct a unified description of all interactions including gravity. For this purpose it has been expected that the AdS/CFT correspondence would play a key role. We have been much involved in studying holographic properties between gravity and gauge theories.

We are also very much interested in the early universe and have been applying particle physics technics to computation of cosmological correlation functions. We are also concerned with the baryon number production in early universe, and in particular with new sources of CP-violation. We are analyzing electric dipole moments of neutron and various atoms by using R-parity violating supersymmetric models to search for new origins of CP-violation..

In connection with the on-going accelerator experiments, the precision test based on radiative corrections is our most favorite subject. We have been interested in the allowed regions of masses of charged and CP-odd Higgs bosons which are expected to be discovered soon.

The mass region expected from the radiative corrections for charged and CP-odd Higgs bosons

in the two-Higgs doublet model