Alumnae and Alumni

Keisuke Izumi
Position
Project Researcher (from 2009/04/01 to 2011/03/31)
Current Affiliation
Theoretical Particle Physics Group, Department of Physics, Graduate School of Science, Nagoya University
Assistant Professor

URL
http://www.kmi.nagoya-u.ac.jp/CT/jpn/members/
PHOTO

Last Update 2018/01/26

The present-day acceleration of the universe’s expansion is one of cosmology’s most interesting phenomena. Although most investigations take a scalar approach, this phenomenon may indicate large-scale modification of general relativity. Ghost excitation, which has negative energy, is problematic for a modified gravity theory that takes into account this acceleration. However, I’ve shown that ghost excitation causes negligible instability.


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