Astrophysics > Cosmology and Nongalactic Astrophysics
[Submitted on 27 Mar 2015]
Title:The bispectrum of single-field inflationary trajectories with $c_{s} \neq 1$
View PDFAbstract:The bispectrum of single-field inflationary trajectories in which the speed of sound of the inflationary trajectories $c_s$ is constant but not equal to the speed of light $c=1$ is explored. The trajectories are generated as random realisations of the Hubble Slow-Roll (HSR) hierarchy and the bispectra are calculated using numerical techniques that extends previous work. This method allows for out-of-slow-roll models with non-trivial time dependence and arbitrarily low $c_s$. The ensembles obtained using this method yield distributions for the shape and scale-dependence of the bispectrum and their relations with the standard inflationary parameters such as scalar spectral tilt $n_s$ and tensor-to-scalar ratio $r$. The distributions demonstrate the squeezed-limit consistency relations for arbitrary single-field inflationary models.
Submission history
From: Carlo R. Contaldi [view email][v1] Fri, 27 Mar 2015 15:05:17 UTC (2,792 KB)
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