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- W1978365844 abstract "We use the techniques of effective field theory in an expanding universe to examine the effect of choosing an excited inflationary initial state built over the Bunch–Davies state on the CMB bi-spectrum. We find that, even for Hadamard states, there are unexpected enhancements in the bi-spectrum for certain configurations in momentum space due to interactions of modes in the early stages of inflation. These enhancements can be parametrically larger than the standard ones and are potentially observable in future data. These initial state effects have a characteristic signature in l-space which distinguishes them from the usual contributions, with the enhancement being most pronounced for configurations corresponding to flattened triangles for which two momenta are collinear." @default.
- W1978365844 created "2016-06-24" @default.
- W1978365844 creator A5028348518 @default.
- W1978365844 creator A5041717673 @default.
- W1978365844 date "2008-05-06" @default.
- W1978365844 modified "2023-10-18" @default.
- W1978365844 title "Enhanced non-Gaussianity from excited initial states" @default.
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- W1978365844 doi "https://doi.org/10.1088/1475-7516/2008/05/001" @default.
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