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Speaker |
KORUMILLI, SRAVAN KUMAR |
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Coauthors |
K. Sravan Kumar, João Marto, Paulo Vargas Moniz and Suratna Das |
| Talk Title |
Gravitational waves in $ \alpha- $ attractors |
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Abstract |
In this paper we consider the $\alpha-$ attractor model and study inflation under a generalization of slow-roll dynamics. We follow the recently proposed Gong \& Sasaki approach \cite{Gong:2015ypa} of assuming N=N(\phi). We relax the requirement of inflaton potential flatness and consider a sufficiently steep one to support 60-efoldings. We find that this type of inflationary scenario predicts an attractor at n_{s}~0.967 and r~5.5×10^{-4} which are very close to the predictions of the first chaotic inflationary model in supergravity (Goncharov-Linde model) \cite{Goncharov:1983mw}. We show that even with non-slow-roll dynamics, the α−attractor model is compatible with any value of r<0.1. In addition, we emphasize that in this particular inflationary scenario, the standard consistency relation (r~−8n_{t}) is significantly violated and we find an attractor for tensor tilt at nt≈−0.034 as r→0. Any prominent detection of the tilt of gravitational waves from future observations can test this non-slow-roll inflationary scenario for α−attractors. In addition, we also comment on the stabilization of the inflaton's trajectory in the supergravity embedding of this model. |
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