MG13 - Talk detail |
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Participant |
Ohashi, Junko | |||||||
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Institution |
Tokyo University of Science - 1-3 Kagurazaka - Tokyo - Shinjuku-ku - Japan | |||||||
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Session |
CM1 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Potential-driven Galileon inflation | |||||
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Abstract |
A Galileon-like nonlinear derivative interaction leads to a enhanced friction during inflation, by which even steep potentials for the standard inflation can drive cosmic acceleration. However if the Galileon kinetic term is dominant by the end of inflation, this can affect the oscillation of the inflaton during reheating and the scalar propagation speed squared $c_s^2$ can be negative. For chaotic inflation and natural inflation we clarify the parameter space in which $c_s^2$ remains always positive and the coherent oscillation of the field occurs. We also place observational constraints on the inflaton potentials from the information of the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$. |
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