publication . Preprint . Article . 2014

Resolving primordial physics through correlated signatures

Kari Enqvist; David J. Mulryne; Sami Nurmi;
Open Access English
  • Published: 18 Dec 2014
Abstract
We discuss correlations among spectral observables as a new tool for differentiating between models for the primordial perturbation. We show that if generated in the isocurvature sector, a running of the scalar spectral index is correlated with the statistical properties of non-Gaussianities. In particular, we find a large running will inevitably be accompanied by a large running of $f_{\rm NL}$ and enhanced $g_{\rm NL}$, with $g_{\rm NL}\gg f_{\rm NL}^2$. If the tensor to scalar ratio is large, a large negative running must turn positive on smaller scales. Interestingly, the characteristic scale of the transition could potentially distinguish between the inflat...
Subjects
arXiv: Astrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: Astrophysics - Cosmology and Nongalactic Astrophysics, Astronomy and Astrophysics, Observable, Scalar (physics), Spectral index, Cosmological perturbation theory, Inflation, media_common.quotation_subject, media_common, Particle physics, Physics, Perturbation (astronomy), Classical mechanics, Inflaton, Tensor
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