Speaker
Dr
Tomohiro Fujita
(Kyoto Univ.)
Description
We show that a detectable tensor-to-scalar ratio (r≥0.001) on the CMB scale can be generated even during extremely low energy inflation which saturates the BBN bound ρ=(30MeV)^4. The source of the gravitational waves is not quantum fluctuations of graviton but those of SU(2) gauge fields, energetically supported by coupled axion fields. The curvature perturbation, the backreaction effect and the validity of perturbative treatment are carefully checked. Our result indicates that measuring r alone does not immediately fix the inflationary energy scale.
| Presentation type | Parallel talk |
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Primary author
Dr
Tomohiro Fujita
(Kyoto Univ.)
