Non-Gaussian signatures of tachyacoustic cosmology
Bessada, Dennis [UNIFESP]
Is part ofJournal of Cosmology and Astroparticle Physics
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I investigate non-Gaussian signatures in the context of tachyacoustic cosmology, that is, a noninflationary model with superluminal speed of sound. I calculate the full non-Gaussian amplitude A, its size f(NL), and corresponding shapes for a red-tilted spectrum of primordial scalar perturbations. Specifically, for cuscuton-like models I show that f(NL) similar to O(1), and the shape of its non-Gaussian amplitude peaks for both equilateral and local configurations, the latter being dominant. These results, albeit similar, are quantitatively distinct from the corresponding ones obtained by Magueijo et al. in the context of superluminal bimetric models.
CitationJournal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 9, 17 p., 2012.
SponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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