New leading contributions to non-gaussianity in single field inflation
arXiv:2412.06616 · doi:10.1140/epjc/s10052-026-15452-2
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.
arXiv comment60 pages. v1: 4 appendices. v2: published version. 5 appendices
References in corpus (25)
- Non-Gaussian features of primordial fluctuations in single field inflationary models
- Planck 2018 results. X. Constraints on inflation
- Quantum Contributions to Cosmological Correlations
- A general proof of the conservation of the curvature perturbation
- Second-Order Cosmological Perturbations from Inflation
- Single field consistency relation for the 3-point function
- CMB Anomalies after Planck
- Adiabatic Modes in Cosmology
- Higher order corrections to primordial spectra from cosmological inflation
- Ultra slow-roll inflation demystified
- Schwinger-Keldysh Diagrammatics for Primordial Perturbations
- Conserved non-linear quantities in cosmology
- Prospects for Cosmological Collider Physics
- Large slow-roll corrections to the bispectrum of noncanonical inflation
- The Conformal Limit of Inflation in the Era of CMB Polarimetry
- Fayet-Iliopoulos terms in supergravity and D-term inflation
- No time to derive: unraveling total time derivatives in in-in perturbation theory
- Inflation from Supersymmetry Breaking
- Slow-Roll Inflation at N3LO
- The squeezed limit of the bispectrum in multi-field inflation
- Proving the absence of large one-loop corrections to the power spectrum of curvature perturbations in transient ultra-slow-roll inflation within the path-integral approach
- Roles of boundary and equation-of-motion terms in cosmological correlation functions
- Primordial power spectrum at N3LO in effective theories of inflation
- Third-order corrections to the slow-roll expansion: calculation and constraints with Planck, ACT, SPT, and BICEP/Keck
- Bispectrum at NLO in single field inflation: conservation and squeezed limit