| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
We proposed a new mechanism of generating the distortion in cosmic microwave
background (CMB) originated from primordial gravitational waves. Such distortion is generated by the damping of the temperature anisotropies through the Thomson scattering, even on scales larger than that of Silk damping. We gave new constraints on small-scale non-Gaussianity of primordial curvature perturbations by the use of anisotropies in acoustic reheating, where the inhomogeneities below the diffusion scale are erased due to Silk damping so that the universe is heated by the conversion of the dissipated energy of photon. We also introduced second order conserved quantities on superhorizon scales (under adequate conditions) even in the presence of the gradient terms by employing the full second order cosmological perturbation theory.
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