2013/03/14 by Aditya Aravind, Dustin Lorshbough, Sonia Paban +1 · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Excited state #Non-Gaussianity #Physics #Quantum mechanics #Statistical physics #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1007/jhep07(2013)076
published as JHEP 1307 (2013) 076
arxiv created 2013/03/14 · openalex publication_date 2013/07/01 · arxiv updated 2014/06/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study squeezed limit fNL 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 backreaction. We show that most excited initial inflationary states for single field inflationary models with negligible superhorizon evolution do not produce an observable squeezed limit fNL. 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<|βk|≤0.1 may generate a squeezed limit fNL which is detectable with future experiments.