Bimetric structure formation: NonGaussian predictions
Abstract
The minimal bimetric theory employing a disformal transformation between matter and gravity metrics is known to produce exactly scaleinvariant fluctuations. It has a purely equilateral nonGaussian 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 gcircumflex{sub {mu}{nu}}=g{sub {mu}{nu}}B{partial_derivative}{sub {mu}{phi}{partial_derivative}{nu}{phi}} can run with {phi}. For powerlaw 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:

 Theoretical Physics, Blackett Laboratory, Imperial College, London, SW7 2BZ (United Kingdom)
 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 05562821
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BORNINFELD THEORY; COUPLING; FLUCTUATIONS; FORECASTING; GRAVITATION; SIMULATION; SPECTRA; TRANSFORMATIONS; VARIATIONS
Citation Formats
Magueijo, Joao, Noller, Johannes, and Piazza, Federico. Bimetric structure formation: NonGaussian predictions. United States: N. p., 2010.
Web. doi:10.1103/PHYSREVD.82.043521.
Magueijo, Joao, Noller, Johannes, & Piazza, Federico. Bimetric structure formation: NonGaussian predictions. United States. https://doi.org/10.1103/PHYSREVD.82.043521
Magueijo, Joao, Noller, Johannes, and Piazza, Federico. 2010.
"Bimetric structure formation: NonGaussian predictions". United States. https://doi.org/10.1103/PHYSREVD.82.043521.
@article{osti_21420926,
title = {Bimetric structure formation: NonGaussian 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 scaleinvariant fluctuations. It has a purely equilateral nonGaussian 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 gcircumflex{sub {mu}{nu}}=g{sub {mu}{nu}}B{partial_derivative}{sub {mu}{phi}{partial_derivative}{nu}{phi}} can run with {phi}. For powerlaw 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 = {05562821},
number = 4,
volume = 82,
place = {United States},
year = {2010},
month = {8}
}