Yoshihisa Kitazawa

J-GLOBAL         Last updated: May 2, 2013 at 15:16
 
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Name
Yoshihisa Kitazawa
E-mail
kitazawapost.kek.jp

Research Interests

 
 

Research Areas

 
 

Academic & Professional Experience

 
Sep 1991
 - 
Mar 1997
Associate Professor, Tokyo Institute of Technology
 
May 1987
 - 
Aug 1991
Assistant Professor, University of Tokyo
 
Sep 1983
 - 
Aug 1986
McCormick Fellow, University of Chicago
 

Education

 
Sep 1980
 - 
Aug 1983
Princeton University
 
Apr 1976
 - 
Mar 1980
University of Tokyo
 

Misc

 
Hiroyuki Kitamoto, Yoshihisa Kitazawa
   Nov 2012
We extend our investigation of the IR effects on the local dynamics of matter
fields in quantum gravity. Specifically we clarify how the IR effects depend on
the change of the quantization scheme: different parametrization of the metric
and the ma...
Hiroyuki Kitamoto, Yoshihisa Kitazawa
   Apr 2012
We extend our investigation of soft graviton effects on the microscopic
dynamics of matter fields in de Sitter space. We evaluate the quantum equation
of motion in generic gauge theories. We find that the Lorentz invariance can be
respected and th...
Hiroyuki Kitamoto, Yoshihisa Kitazawa
   Mar 2012
The scale invariance of the quantum fluctuations in de Sitter space leads to
the appearance of de Sitter symmetry breaking infra-red logarithms in the
graviton propagator. We investigate physical effects of soft gravitons on the
local dynamics of ...
Hiroyuki Kitamoto, Yoshihisa Kitazawa
   Sep 2011
We extend our investigation on a possible de Sitter symmetry breaking
mechanism in non-linear sigma models. The scale invariance of the quantum
fluctuations could make the cosmological constant time dependent signaling the
de Sitter symmetry break...
Hiroyuki Kitamoto, Yoshihisa Kitazawa
Phys.Rev.D83:104043,2011      Dec 2010
We investigate infra-red dynamics of the non-linear sigma model in de Sitter
space. In the presence of minimally coupled massless scalar fields, the de
Sitter symmetry is dynamically broken and physical constants become time
dependent. We find tha...