3 papers
hep-th2000
Action of Singular Instantons of Hawking-Turok Type
Masashi Hashimoto
Using Kaluza-Klein technique we show that the singularity of Hawking-Turok type has a fixed point (bolt) contribution to the action in addition to the usual boundary contribution.…
hep-ph1998
Gravitino Overproduction through Moduli Decay
M. Hashimoto, K. -I. Izawa, M. Yamaguchi +1
We derive cosmological constraints on the masses of generic scalar fields which decay only through gravitationally suppressed interactions into unstable gravitinos and ordinary par…
hep-ph1998
Axion Cosmology with its Scalar Superpartner
M. Hashimoto, K. -I. Izawa, M. Yamaguchi +1
In supersymmetric theories, the Peccei-Quinn symmetry has a complex extension as a symmetry of the superpotential, so that the scalar potential always has an almost flat direction,…