Moduli/Inflaton Mixing with Supersymmetry Breaking Field

Motoi Endo, Koichi Hamaguchi and Fuminobu Takahashi 1 Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany 2 Institute for Cosmic Ray Research, University of Tokyo, Chiba 277-8582, Japan 3 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan Abstract A heavy scalar field such as moduli or an inflaton generally mixes with a field responsible for the supersymmetry breaking. We study the scalar decay into the standard model particles and their superpartners, gravitinos, and the supersymmetry breaking sector, particularly paying attention to decay modes that proceed via the mixing between the scalar and the supersymmetry breaking field. The impacts of the new decay processes on cosmological scenarios are also discussed; the modulus field generically produces too many gravitinos, and most of the inflation models tend to result in too high reheating temperature and/or gravitino overproduction.