Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-06-27
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
18 pages, 10 figures; v2: Plots and captions of figs. 7 and 10 corrected
Scientific paper
We study an inflationary model driven by a single minimally coupled standard kinetic term scalar field with a step in its mass modeled by an Heaviside step function. We present an analytical approximation for the mode function of the curvature perturbation, obtain the power spectrum analytically and compare it with the numerical result. We show that, after the scale set by the step, the spectrum contains damped oscillations that are well described by our analytical approximation. We also compute the dominant contribution to the bispectrum in the equilateral and the squeezed limits and find new shapes. In the equilateral and squeezed limits the bispectrum oscillates and it has a linear growth envelope towards smaller scales. The bispectrum size can be large depending on the model parameters.
Arroja Frederico
Enea Romano Antonio
Sasaki Misao
No associations
LandOfFree
Large and strong scale dependent bispectrum in single field inflation from a sharp feature in the mass does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Large and strong scale dependent bispectrum in single field inflation from a sharp feature in the mass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large and strong scale dependent bispectrum in single field inflation from a sharp feature in the mass will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-638472