Loop corrections and a new test of inflation
arXiv:1207.1772 · doi:10.1103/PhysRevD.87.043512
Abstract
Inflation is the leading paradigm for explaining the origin of primordial density perturbations and the observed temperature fluctuations of the cosmic microwave background. However many open questions remain, in particular whether one or more scalar fields were present during inflation and how they contributed to the primordial density perturbation. We propose a new observational test of whether multiple fields, or only one (not necessarily the inflaton) generated the perturbations. We show that our test, relating the bispectrum and trispectrum, is protected against loop corrections at all orders, unlike previous relations.
6 pages; v2: references added, minor changes; v3: Extended discussion, including the role of gravitational corrections. References added. Version accepted for publication in PRD
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- Primordial non-Gaussianity in the bispectra of large-scale structure
- Non-Gaussian Mode Coupling and the Statistical Cosmological Principle
- Testing Multi-Field Inflation with Galaxy Bias
- Implications of the Planck bispectrum constraints for the primordial trispectrum
- Influence of Reheating on the Trispectrum and its Scale Dependence
- Strong restriction on inflationary vacua from the local gauge invariance III: Infrared regularity of graviton loops
- Single-Field Inflation and the Local Ansatz: Distinguishability and Consistency
- A test of the Suyama-Yamaguchi inequality from weak lensing
- Higher order non-linear parameters with PLANCK