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Breit-Wigner Enhancement of Dark Matter Annihilation
Masahiro Ibe, Hitoshi Murayama, T. T. Yanagida
We point out that annihilation of dark matter in the galactic halo can be enhanced relative to that in the early universe due to a Breit-Wigner tail, if the dark matter annihilates…
Preheating in Supersymmetric Theories
Z. Chacko, H. Murayama, M. Perelstein
We examine the particle production via preheating at the end of inflation in supersymmetric theories. The inflaton and matter scalars are now necessarily complex fields, and their…
Leptogenesis from -dominated early universe
K. Hamaguchi, Hitoshi Murayama, T. Yanagida
We investigate in detail the leptogenesis by the decay of coherent right-handed sneutrino having dominated the energy density of the early universe, which was origi…
LSND, SN1987A, and CPT Violation
Hitoshi Murayama, T. Yanagida
We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For (the lig…
Earth Matter Effect in 7Be Solar Neutrino Experiments
Andre de Gouvea, Alexander Friedland, Hitoshi Murayama
We determine the sensitivity of the KamLAND and Borexino experiments to the neutrino regeneration effect in the Earth as a function of Delta m^2 and theta, using realistic numbers…
Low-Energy Effective Lagrangian in Unified Theories with Non-Universal Supersymmetry Breaking Terms
Yoshiharu Kawamura, Hitoshi Murayama, Masahiro Yamaguchi
Supersymmetric grand unified theories with non-universal soft supersymmetry breaking terms are studied. By integrating out the superheavy fields at an unification scale, we compute…