Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2013)076
Keywords
Cosmology of Theories beyond the SM; Nonperturbative Effects
Categories
Funding
- National Science Foundation [PHY-0969020]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969020] Funding Source: National Science Foundation
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We study squeezed limit f(NL) generation by excited initial inflationary states in a model independent way. We restrict excited to mean a Bogoliubov transformation of the Bunch Davies state. We simultaneously impose the constraints that the observable power spectrum is nearly scale invariant over at least three decades and that the observable modes today be subhorizon at the beginning of inflation while not causing significant back-reaction. We show that most excited initial inflationary states for single field inflationary models with negligible superhorizon evolution do not produce an observable squeezed limit f(NL). The case in which one mode is in the Bunch Davies state while the other two modes are in an excited state with 0.01 < vertical bar beta(k)vertical bar <= 0.1 may generate a squeezed limit f(NL) which is detectable with future experiments.
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