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Abstract: The non-Gaussian distribution of primordial perturbations has the potentialto reveal the physical processes at work in the very early Universe. Localmodels provide a well-defined class of non-Gaussian distributions that arisenaturally from the non-linear evolution of density perturbations onsuper-Hubble scales starting from Gaussian field fluctuations during inflation.I describe the delta-N formalism used to calculate the primordial densityperturbation on large scales and then review several models for the origin oflocal primordial non-Gaussianity, including the cuvaton, modulated reheatingand ekpyrotic scenarios. I include an appendix with a table of sign conventionsused in specific papers.



Autor: David Wands ICG, Portsmouth, and YITP, Kyoto

Fuente: https://arxiv.org/



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