Local features with large spiky non-Gaussianities during inflation

Journal Article · Thu Nov 01 00:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/11/012· OSTI ID:22279681

Abolhasani, Ali Akbar; Firouzjahi, Hassan ^[1]; Khosravi, Shahram ^[2]; Sasaki, Misao ^[3]

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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)

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.

• OSTI ID: 22279681
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
COSMOLOGY
ENERGY SPECTRA
FLUCTUATIONS
INFLATIONARY UNIVERSE
INFLATONS
PERTURBATION THEORY
PHASE TRANSFORMATIONS
RELICT RADIATION