Mark G. Jackson, Koenraad Schalm
We compute the model-independent contributions to the primordial bispectrum
and trispectrum in de Sitter space due to high-energy physics. We do this by
coupling a light inflaton to an auxiliary heavy field, and then evaluating
correlation functions in the Schwinger-Keldysh "in-in" formalism. The
high-energy physics produces corrections parametrized by H/M where H is the
scale of inflation and M is the mass of the heavy field. The bispectrum peaks
near the elongated shape, but otherwise contains no features. On the other
hand, the trispectrum contains oscillations which are of a magnitude possibly
detectable using upcoming data. These oscillations are the cosmological
analogue of energy eigenstate mixing.
View original:
http://arxiv.org/abs/1202.0604
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