2017 Fiscal Year Final Research Report
New observational tools in cosmology
| Project/Area Number |
26610062
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2014-04-01 – 2018-03-31
|
| Keywords | 宇宙背景放射 |
|---|
| 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.
|
| Free Research Field |
宇宙論
|
