Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models
Abstract
We calculate the quadra-spectrum and quint-spectrum, corresponding to five and six point correlation functions of the curvature perturbation. For single field inflation with standard kinetic term, the quadra-spectrum and quint-spectrum are small, which are suppressed by slow roll parameters. The calculation can be generalized to multiple fields. When there is no entropy perturbation, the quadra-spectrum and quint-spectrum are suppressed as well. With the presence of entropy perturbation, the quadra-spectrum and quint-spectrum can get boosted. We illustrate this boost in the multi-brid inflation model. For the curvaton scenario, the quadra-spectrum and quint-spectrum are also large in the small r limit. We also calculate representative terms of quadra-spectrum and quint-spectrum for inflation with generalized kinetic terms, and estimate their order of magnitude for quasi-single field inflation.
Keywords
Cite
@article{arxiv.1004.0461,
title = {Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models},
author = {Chunshan Lin and Yi Wang},
journal= {arXiv preprint arXiv:1004.0461},
year = {2010}
}
Comments
16 pages; v2: references added.