Description
Chair: Nick Kaiser (IFA, UH)
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Prof. Jun'ichi Yokoyama (RESCEU, The University of Tokyo)11/14/13, 2:10 PMCosmologyoralIn inflation models whose reheating occurs through gravitational particle production, only conformally noninvariant fields are created. In particular, fermions are created if and only if they have nonvanishing mass terms. Since mass terms are geerically proportional to the expectation value of the relevant Higgs field, its spatialy fluctuation gives rise to spatially fluctuating particle...Go to contribution page
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Prof. Takahiro Tanaka (Yukawa Insititute for Theoretical Physics)11/14/13, 2:35 PMCosmologyoralWe discuss graviton oscillations based on the ghost free bi-gravity theory. We point out that this theory possesses a natural cosmological background solution which is very close to the case of general relativity. Furthermore, interesting parameter range of the graviton mass, which can be explored by the observations of gravitational waves, is not at all excluded by the constraint from the...Go to contribution page
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Mr Naoya Kitajima (University of Tokyo)11/14/13, 3:00 PMCosmologyoralWe investigate the gravitational wave background induced by the first order scalar perturbations in the curvaton models. We consider the quadratic and axion-like curvaton potential which can generate the blue-tilted power spectrum of curvature perturbations on small scales and derive the maximal amount of gravitational wave background today. We find the power spectrum of the induced...Go to contribution page
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Dr Jiro Matsumoto (Tohoku University)11/14/13, 3:25 PMCosmologyoralThe quasistatic solutions of the matter density perturbation in various dark energy models and modified gravity models have been investigated in numerous papers. However, the oscillating solutions in those models have not been investigated enough so far. In this talk, the oscillating solutions are also examined by using appropriate approximations. And the behaviors of the matter density...Go to contribution page