New leading contributions to non-gaussianity in single field inflation
High Energy Physics - Theory
2026-03-31 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
We compute the bispectrum of primordial density perturbations in CMB to second order in the slow-roll parameters of single field inflation. We correct previous results and found that next-to-leading order corrections can be of the same order as the leading order result in a large class of models, including hilltop inflation.
Keywords
Cite
@article{arxiv.2412.06616,
title = {New leading contributions to non-gaussianity in single field inflation},
author = {Ignatios Antoniadis and Auttakit Chatrabhuti and Jules Cunat and Hiroshi Isono},
journal= {arXiv preprint arXiv:2412.06616},
year = {2026}
}
Comments
60 pages. v1: 4 appendices. v2: published version. 5 appendices