Alumnae and Alumni

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


Last Update 2024/01/04

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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