Bimetric structure formation: non-Gaussian predictions

Details Bimetric structure formation: non-Gaussian predictions Bimetric structure formation: non-Gaussian predictions

2010-06-16

arxiv.org/abs/1006.3216v2

Phys.Rev.D82:043521,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 2 figures. References and minor comments added in revised version

Scientific paper

10.1103/PhysRevD.82.043521

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 DBI inflation (with opposite sign) but larger than standard inflation. We consider non-minimal bimetric models, where the coupling $B$ appearing in the disformal transformation ${\hat g}_{\mn}= g_{\mn} -B\partial_\mu\phi\partial_\nu\phi$ 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 non-minimal bimetric models.

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