Model-Independent Signatures of New Physics in non-Gaussianity

Details Model-Independent Signatures of New Physics in non-Gaussianity Model-Independent Signatures of New Physics in non-Gaussianity

2012-02-03

arxiv.org/abs/1202.0604v1

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 8 figures

Scientific paper

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.

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