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Title: Local features with large spiky non-Gaussianities during inflation

Abstract

We provide a dynamical mechanism to generate localized features during inflation. The local feature is due to a sharp waterfall phase transition which is coupled to the inflaton field. The key effect is the contributions of waterfall quantum fluctuations which induce a sharp peak on the curvature perturbation which can be as large as the background curvature perturbation from inflaton field. Due to non-Gaussian nature of waterfall quantum fluctuations a large spike non-Gaussianity is produced which is narrowly peaked at modes which leave the Hubble radius at the time of phase transition. The large localized peaks in power spectrum and bispectrum can have interesting consequences on CMB anisotropies.

Authors:
;  [1];  [2];  [3]
  1. School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)
  2. Physics Department, Faculty of Science, Kharazmi University, Tehran (Iran, Islamic Republic of)
  3. Yukawa Institute for theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
Publication Date:
OSTI Identifier:
22279681
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; COSMOLOGY; ENERGY SPECTRA; FLUCTUATIONS; INFLATIONARY UNIVERSE; INFLATONS; PERTURBATION THEORY; PHASE TRANSFORMATIONS; RELICT RADIATION

Citation Formats

Abolhasani, Ali Akbar, Firouzjahi, Hassan, Khosravi, Shahram, and Sasaki, Misao, E-mail: abolhasani@mail.ipm.ir, E-mail: firouz@mail.ipm.ir, E-mail: khosravi@mail.ipm.ir, E-mail: misao@yukawa.kyoto-u.ac.jp. Local features with large spiky non-Gaussianities during inflation. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/012.
Abolhasani, Ali Akbar, Firouzjahi, Hassan, Khosravi, Shahram, & Sasaki, Misao, E-mail: abolhasani@mail.ipm.ir, E-mail: firouz@mail.ipm.ir, E-mail: khosravi@mail.ipm.ir, E-mail: misao@yukawa.kyoto-u.ac.jp. Local features with large spiky non-Gaussianities during inflation. United States. doi:10.1088/1475-7516/2012/11/012.
Abolhasani, Ali Akbar, Firouzjahi, Hassan, Khosravi, Shahram, and Sasaki, Misao, E-mail: abolhasani@mail.ipm.ir, E-mail: firouz@mail.ipm.ir, E-mail: khosravi@mail.ipm.ir, E-mail: misao@yukawa.kyoto-u.ac.jp. Thu . "Local features with large spiky non-Gaussianities during inflation". United States. doi:10.1088/1475-7516/2012/11/012.
@article{osti_22279681,
title = {Local features with large spiky non-Gaussianities during inflation},
author = {Abolhasani, Ali Akbar and Firouzjahi, Hassan and Khosravi, Shahram and Sasaki, Misao, E-mail: abolhasani@mail.ipm.ir, E-mail: firouz@mail.ipm.ir, E-mail: khosravi@mail.ipm.ir, E-mail: misao@yukawa.kyoto-u.ac.jp},
abstractNote = {We provide a dynamical mechanism to generate localized features during inflation. The local feature is due to a sharp waterfall phase transition which is coupled to the inflaton field. The key effect is the contributions of waterfall quantum fluctuations which induce a sharp peak on the curvature perturbation which can be as large as the background curvature perturbation from inflaton field. Due to non-Gaussian nature of waterfall quantum fluctuations a large spike non-Gaussianity is produced which is narrowly peaked at modes which leave the Hubble radius at the time of phase transition. The large localized peaks in power spectrum and bispectrum can have interesting consequences on CMB anisotropies.},
doi = {10.1088/1475-7516/2012/11/012},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}