http://arxiv.org/abs/1604.01440
In the framework of string field theory (SFT) a setting where the closed string dilaton is coupled to the open string tachyon at the final stage of an unstable brane or brane-anti-brane pair decay is considered. We show that this configuration can lead to viable inflation by means of the dilaton becoming a non-local (infinite-derivative) inflaton. The structure of non-locality leads to interesting inflationary scenarios. We obtain (i) a class of single field inflation with universal attractor predictions at $n_{s}\sim0.967$ with any value of $r<0.1$, where the tensor to scalar ratio $r$ can be solely regulated by parameters of the SFT; (ii) a new class of two field conformally invariant models with a peculiar quadratic cross-product of scalar fields. We analyze a specific case where a spontaneously broken conformal invariance leads to Starobinsky like inflation plus creating an uplifted potential minimum which accounts to vacuum energy after inflation.
A. Koshelev, K. Kumar and P. Moniz
Thu, 7 Apr 16
4/51
Comments: 22 pages, 1 figure
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