http://arxiv.org/abs/1511.03413
We review the effects of heavy scalar fields during inflation in the framework of $\mathcal N = 1$ supergravity. Such heavy scalars can be geometric moduli from string compactifications or stabilizer fields from a different sector of the theory. Even when these fields are heavier than the Hubble scale during inflation, they generically cause backreactions which alter the dynamics of the system. Severe problems may arise when the heavy fields break supersymmetry, which is quite generic for K\”ahler moduli. We illustrate these effects in two examples, chaotic inflation and Starobinsky-like inflation. In chaotic inflation the backreaction of heavy K\”ahler moduli causes a flattening of the quadratic potential. In many setups of Starobinsky-like inflation, however, backreactions spoil the flatness of the plateau.
E. Dudas and C. Wieck
Thu, 12 Nov 15
16/61
Comments: 12 pages, 4 figures. Contribution to the proceedings of the 18th International Conference `From the Planck Scale to the Electroweak Scale’, 25-29 May 2015, Ioannina, Greece
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