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Title: Generically large nongaussianity in small multifield inflation

Abstract

If forthcoming measurements of cosmic photon polarization restrict the primordial tensor-to-scalar ratio to r < 0.01, small field inflation will be a principal candidate for the origin of the universe. Here we show that small multifield inflation, without the hybrid mechanism, typically results in large squeezed nongaussianity. Small multifield potentials contain multiple flat field directions, often identified with the gauge invariant field directions in supersymmetric potentials. We find that unless these field directions have equal slopes, large nongaussianity arises. After identifying relevant differences between large and small two-field potentials, we demonstrate that the latter naturally fulfill the Byrnes-Choi-Hall large nongaussianity conditions. Computations of the primordial power spectrum, spectral index, and squeezed bispectrum, reveal that small two-field models which otherwise match observed primordial perturbations, produce excludably large nongaussianity if the inflatons' field directions have unequal slopes.

Authors:
 [1]
  1. Department of Physics, University of Notre Dame, Notre Dame, IN, 46556 (United States)
Publication Date:
OSTI Identifier:
22525737
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CALCULATION METHODS; COSMIC PHOTONS; COSMOLOGICAL INFLATION; DISTURBANCES; GAUGE INVARIANCE; INDEXES; INFLATONS; POLARIZATION; POTENTIALS; SCALARS; SUPERSYMMETRY; TENSORS; UNIVERSE

Citation Formats

Bramante, Joseph, E-mail: josephbramante@gmail.com. Generically large nongaussianity in small multifield inflation. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/07/006.
Bramante, Joseph, E-mail: josephbramante@gmail.com. Generically large nongaussianity in small multifield inflation. United States. doi:10.1088/1475-7516/2015/07/006.
Bramante, Joseph, E-mail: josephbramante@gmail.com. Wed . "Generically large nongaussianity in small multifield inflation". United States. doi:10.1088/1475-7516/2015/07/006.
@article{osti_22525737,
title = {Generically large nongaussianity in small multifield inflation},
author = {Bramante, Joseph, E-mail: josephbramante@gmail.com},
abstractNote = {If forthcoming measurements of cosmic photon polarization restrict the primordial tensor-to-scalar ratio to r < 0.01, small field inflation will be a principal candidate for the origin of the universe. Here we show that small multifield inflation, without the hybrid mechanism, typically results in large squeezed nongaussianity. Small multifield potentials contain multiple flat field directions, often identified with the gauge invariant field directions in supersymmetric potentials. We find that unless these field directions have equal slopes, large nongaussianity arises. After identifying relevant differences between large and small two-field potentials, we demonstrate that the latter naturally fulfill the Byrnes-Choi-Hall large nongaussianity conditions. Computations of the primordial power spectrum, spectral index, and squeezed bispectrum, reveal that small two-field models which otherwise match observed primordial perturbations, produce excludably large nongaussianity if the inflatons' field directions have unequal slopes.},
doi = {10.1088/1475-7516/2015/07/006},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2015,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}