Impact of transforming to Conformal Fermi Coordinates on Quasi-Single Field Non-Gaussianity
arXiv:2004.06126 · doi:10.1103/PhysRevD.102.023533
Abstract
In general relativity predictions for observable quantities can be expressed in a coordinate independent way. Nonetheless it may be inconvenient to do so. Using a particular frame may be the easiest way to connect theoretical predictions to measurable quantities. For the cosmological curvature bispectrum such frame is described by the Conformal Fermi Coordinates. In single field inflation it was shown that going to this frame cancels the squeezed limit of the density perturbation bispectrum calculated in Global Coordinates. We explore this issue in quasi single field inflation when the curvaton mass and the curvaton-inflaton mixing are small. In this case, the contribution to the bispectrum from the coordinate transformation to Conformal Fermi Coordinates is of the same order as that from the inflaton-curvaton interaction term but does not cancel it.
arXiv comment13 pages, 2 figures
References in corpus (29)
- Non-Gaussian features of primordial fluctuations in single field inflationary models
- The Effective Field Theory of Inflation
- DBI in the Sky
- Quantum Contributions to Cosmological Correlations
- The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
- Quasi-Single Field Inflation and Non-Gaussianities
- Signatures of Supersymmetry from the Early Universe
- Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation
- TASI Lectures on Inflation
- Cosmological Collider Physics
- Non-Gaussianity from Inflation
- The Observed Squeezed Limit of Cosmological Three-Point Functions
- Dominance of gauge artifact in the consistency relation for the primordial bispectrum
- Heavy-Lifting of Gauge Theories By Cosmic Inflation
- Equilateral non-Gaussianity from heavy fields
- Cosmological Collider Physics and the Curvaton
- Neutrino Signatures in Primordial Non-Gaussianities
- A Cosmological Higgs Collider
- Planck-Suppressed Operators
- Minimal signatures of the Standard Model in non-Gaussianities
- Non-Gaussian Enhancements of Galactic Halo Correlations in Quasi-Single Field Inflation
- How Gaussian can our Universe be?
- Conformal Fermi Coordinates
- Imprints of Oscillatory Bispectra on Galaxy Clustering
- Squeezed Bispectrum in the Formalism: Local Observer Effect in Field Space
- Vanishing of local non-Gaussianity in canonical single field inflation
- New Shapes of Primordial Non-Gaussianity from Quasi-Single Field Inflation with Multiple Isocurvatons
- De Sitter Quantum Loops as the origin of Primordial Non-Gaussianities
- Influence of Unobservable Modes on Correlation Functions during Inflation