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Title: Bimetric structure formation: Non-Gaussian predictions

Abstract

The minimal bimetric theory employing a disformal transformation between matter and gravity metrics is known to produce exactly scale-invariant fluctuations. It has a purely equilateral non-Gaussian signal, with an amplitude smaller than that of Dirac Born Infeld inflation (with opposite sign) but larger than standard inflation. We consider nonminimal bimetric models, where the coupling B appearing in the disformal transformation g-circumflex{sub {mu}{nu}}=g{sub {mu}{nu}}-B{partial_derivative}{sub {mu}{phi}{partial_derivative}{nu}{phi}} can run with {phi}. For power-law B({phi}) these models predict tilted spectra. For each value of the spectral index, a distinctive distortion to the equilateral property can be found. The constraint between this distortion and the spectral index can be seen as a 'consistency relation' for nonminimal bimetric models.

Authors:
;  [1];  [2]
  1. Theoretical Physics, Blackett Laboratory, Imperial College, London, SW7 2BZ (United Kingdom)
  2. Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5 (Canada)
Publication Date:
OSTI Identifier:
21420926
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 82; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.82.043521; (c) 2010 American Institute of Physics; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BORN-INFELD THEORY; COUPLING; FLUCTUATIONS; FORECASTING; GRAVITATION; SIMULATION; SPECTRA; TRANSFORMATIONS; VARIATIONS

Citation Formats

Magueijo, Joao, Noller, Johannes, and Piazza, Federico. Bimetric structure formation: Non-Gaussian predictions. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.043521.
Magueijo, Joao, Noller, Johannes, & Piazza, Federico. Bimetric structure formation: Non-Gaussian predictions. United States. https://doi.org/10.1103/PHYSREVD.82.043521
Magueijo, Joao, Noller, Johannes, and Piazza, Federico. 2010. "Bimetric structure formation: Non-Gaussian predictions". United States. https://doi.org/10.1103/PHYSREVD.82.043521.
@article{osti_21420926,
title = {Bimetric structure formation: Non-Gaussian predictions},
author = {Magueijo, Joao and Noller, Johannes and Piazza, Federico},
abstractNote = {The minimal bimetric theory employing a disformal transformation between matter and gravity metrics is known to produce exactly scale-invariant fluctuations. It has a purely equilateral non-Gaussian signal, with an amplitude smaller than that of Dirac Born Infeld inflation (with opposite sign) but larger than standard inflation. We consider nonminimal bimetric models, where the coupling B appearing in the disformal transformation g-circumflex{sub {mu}{nu}}=g{sub {mu}{nu}}-B{partial_derivative}{sub {mu}{phi}{partial_derivative}{nu}{phi}} can run with {phi}. For power-law B({phi}) these models predict tilted spectra. For each value of the spectral index, a distinctive distortion to the equilateral property can be found. The constraint between this distortion and the spectral index can be seen as a 'consistency relation' for nonminimal bimetric models.},
doi = {10.1103/PHYSREVD.82.043521},
url = {https://www.osti.gov/biblio/21420926}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 4,
volume = 82,
place = {United States},
year = {2010},
month = {8}
}