Enhanced Non-Gaussianity from Excited Initial States

  title={Enhanced Non-Gaussianity from Excited Initial States},
  author={Richard Holman},
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… CONTINUE READING
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