2015 Fiscal Year Final Research Report
Verification of the effects inspired by superstring theory on the generation of primordial perturbations during inflation
| Project/Area Number |
26887042
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Waseda University |
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Principal Investigator |
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| Project Period (FY) |
2014-08-29 – 2016-03-31
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| Keywords | 宇宙物理（理論） |
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| Outline of Final Research Achievements |
In this research, I investigate the influence of D-brane and heavy fields that can be obtained out of string theory on the generation of primordial perturbations during inflation. I clarified the constraints on the primordial non-Gaussianity generated by DBI inflation and DBI galileon inflation with the observations of cosmic microwave background radiation and large scale structure. I also showed that the effect of heavy fields becomes so large that the features in primordial spectra that are generated by the resonance effect can be detected by future observation if the fields have non-canonical kinetic terms. I also pointed out interesting cosmological possibilities with a class of scalar-tensor theory of gravity that is obtained by generalizing galileon models and a gravitational derivative coupling term.
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| Free Research Field |
素粒子・原子核・宇宙線・宇宙物理
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