http://arxiv.org/abs/1911.03736
We propose a more general version of the Trans-Planckian Censorship Conjecture (TCC) which can apply to models of inflation with varying speed of sound. We find that inflation models with $c_S < 1$ are in general more strongly constrained by censorship of trans-Planckian modes than canonical inflation models, with the upper bound on the tensor/scalar ratio reduced by as much as three orders of magnitude for sound speeds consistent with bounds from data. As a concrete example, we apply the constraint to Dirac-Born-Infeld inflation models motivated by string theory.
W. Lin and W. Kinney
Tue, 12 Nov 19
65/84
Comments: 6 pages, 3 figures