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Bosonic Coherent Motions in the Universe
Jihn E. Kim, Yannis Semertzidis, Shinji Tsujikawa
We mini-review the role of fundamental spin-0 bosons as bosonic coherent motion (BCM) in the Universe. The fundamental spin-0 bosons have the potential to account for the baryon nu…
Chaotic dynamics in preheating after inflation
Yoshida Jin, Shinji Tsujikawa
We study chaotic dynamics in preheating after inflation in which an inflaton is coupled to another scalar field through an interaction . We first estimate t…
Introductory review of cosmic inflation
Shinji Tsujikawa
These lecture notes provide an introduction to cosmic inflation. In particular I will review the basic concepts of inflation, generation of density perturbations, and reheating aft…
Fermion production from preheating-amplified metric perturbations
Bruce A. Bassett, Marco Peloso, Lorenzo Sorbo +1
We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre- Robertson-Walker (FLRW) background. Thes…
Massive fermion production in nonsingular superstring cosmology
Shinji Tsujikawa, Hiroki Yajima
We study massive spin-1/2 fermion production in nonsingular superstring cosmology, taking into account one-loop quantum corrections to a superstring effective action with dilaton a…
Brane preheating
Shinji Tsujikawa, Kei-ichi Maeda, Shuntaro Mizuno
We study brane-world preheating in massive chaotic inflationary scenario where scalar fields are confined on the 3-brane. Assuming that quadratic contribution in energy densities d…