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Electromagnetic Cascade in the Early Universe and its Application to the Big-Bang Nucleosynthesis
M. Kawasaki, T. Moroi
We investigate the electromagnetic cascade initiated by injection of very high energy photons in the early Universe and calculate the cascade spectrum by solving a set of Boltzmann…
Limit on the Color-Triplet Higgs Mass in the Minimum Supersymmetric SU(5) Model
J. Hisano, T. Moroi, K. Tobe +1
In the minimum supersymmetric SU(5) GUT, we derive the upper limit on the mass of the color-triplet Higgs multiplets as $\mhc\leq 2.4\times 10^{16}~\GEV$ (90 \% C.L.) taking all po…
On the Solution to the Polonyi Problem with (10~TeV) Gravitino Mass in Supergravity
T. Moroi, M. Yamaguchi, T. Yanagida
We study the solution to the Polonyi problem where the Polonyi field weighs as and decays just before the primordial nucleosynthesis. It is shown that in spite of…
Gravitino Decay into a Neutrino and a Sneutrino in the Inflationary Universe
M. Kawasaki, T. Moroi
Gravitino produced in the inflationary universe are studied. When the gravitino decays into a neutrino and a sneutrino, the emitted high energy neutrinos scatter off the background…
Suppression of Proton Decay in the Missing-Partner Model for Supersymmetric SU(5) GUT
J. Hisano, T. Moroi, K. Tobe +1
We construct a missing-partner model for supersymmetric SU(5) GUT assuming the Peccei-Quinn symmetry, in which the SU(5) gauge coupling constant remains in the perturbative regime…
Flat Potential for Inflaton with a Discrete -invariance in Supergravity
K. Kumekawa, T. Moroi, T. Yanagida
We show that a very flat potential of inflaton required for a sufficient inflation is naturally obtained in supergravity by imposing a discrete -invariance . Severa…