English

The Trispectrum in the Multi-brid Inflation

High Energy Physics - Theory 2009-05-29 v3

Abstract

The trispectrum is at least as important as the bispectrum and its size can be characterized by two parameters τNL\tau_{NL} and gNLg_{NL}. In this short paper, we focus on the Multi-brid inflation, in particular the two-brid inflation model in arXiv.0805.0974, and find that τNL\tau_{NL} is always positive and roughly equals to (65fNL)2({6\over 5}f_{NL})^2 for the low scale inflation, but gNLg_{NL} can be negative or positive and its order of magnitude can be the same as that of τNL\tau_{NL} or even larger

Cite

@article{arxiv.0903.1542,
  title  = {The Trispectrum in the Multi-brid Inflation},
  author = {Qing-Guo Huang},
  journal= {arXiv preprint arXiv:0903.1542},
  year   = {2009}
}

Comments

12 pages; minor correction, refs added; further refs added, version for publication in JCAP

R2 v1 2026-06-21T12:19:49.231Z