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Synchrotron Radiation from the Galactic Center in Decaying Dark Matter Scenario
Koji Ishiwata, Shigeki Matsumoto, Takeo Moroi
We discuss the synchrotron radiation flux from the Galactic center in unstable dark matter scenario. Motivated by the anomalous excess of the positron fraction recently reported by…
Implications of the Curvaton on Inflationary Cosmology
Takeo Moroi, Tomo Takahashi
We study implications of the curvaton, a late-decaying light scalar field, on inflationary cosmology, paying particular attentions to modifications of observable quantities such as…
Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi
We study the big-bang nucleosynthesis (BBN) with the long-lived exotic particle, called X. If the lifetime of X is longer than \sim 0.1 sec, its decay may cause non-thermal nuclear…
Hadronic Decay of Late-Decaying Particles and Big-Bang Nucleosynthesis
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi
We study the big-bang nucleosynthesis (BBN) scenario with late-decaying exotic particles with lifetime longer than sec. With a late-decaying particle in the early universe…
Correlated Isocurvature Fluctuation in Quintessence and Suppressed CMB Anisotropies at Low Multipoles
Takeo Moroi, Tomo Takahashi
We consider cosmic microwave background (CMB) anisotropy in models with quintessence taking into account of isocurvature fluctuation in the quintessence. It is shown that, if the p…
Isocurvature Fluctuations in Tracker Quintessence Models
Masahiro Kawasaki, Takeo Moroi, Tomo Takahashi
We consider effects of the isocurvature perturbation in the framework of the tracker-type quintessence models. During the inflation, fluctuations in the amplitude of the quintessen…
Cosmic Microwave Background Anisotropy with Cosine-Type Quintessence
Masahiro Kawasaki, Takeo Moroi, Tomo Takahashi
We study the Cosmic Microwave Background (CMB) anisotropies produced by cosine-type quintessence models. In our analysis, effects of the adiabatic and isocurvature fluctuations are…
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…
Gravitino Production in the Inflationary Universe and the Effects on Big-Bang Nucleosynthesis
M. Kawasaki, T. Moroi
Gravitino production and decay in the inflationary universe are reexanimed. Assuming that gravitino mainly decays into photon and photino, we have calculated the upperbound of the…