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Orthogonal non-Gaussianities from Dirac-Born-Infeld Galileon inflation · Around

2011

Orthogonal non-Gaussianities from Dirac-Born-Infeld Galileon inflation

Renaux-Petel, Sebastien

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We study the cosmology of the multifield relativistic Galileon model in which an induced gravity term is added to the Dirac-Born-Infeld action.

We highlight the physical insight that is gained by employing a bimetric perspective in which the induced gravity and Einstein-Hilbert action are treated on equal footing.
We derive the conditions under which a phase of quasi exponential inflation can be sustained and demonstrate the existence of a critical background energy density above which cosmological fluctuations become ghosts.
At the non-linear level, this scenario provides the first concrete early Universe model in which the shape of the bispectrum can be predominantly of orthogonal type.

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S. Renaux-Petel, [arXiv:1107.5020 [astro-ph.CO]]

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