Journal
PHYSICAL REVIEW D
Volume 82, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.043521
Keywords
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Funding
- STFC
- Government of Canada through NSERC
- Province of Ontario through the Ministry of Research Innovation
- Science and Technology Facilities Council [ST/G000743/1, ST/F007027/1] Funding Source: researchfish
- STFC [ST/G000743/1, ST/F007027/1] Funding Source: UKRI
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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) over cap (mu nu) = g(mu nu) - B partial derivative(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.
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