Dias, Mafalda, Elliston, Joseph, Frazer, Jonathan, Mulryne, David and Seery, David (2015) The curvature perturbation at second order. Journal of Cosmology and Astroparticle Physics, 2015. ISSN 1475-7516

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Abstract

We give an explicit relation, up to second-order terms, between scalar-field fluctuations defined on spatially-flat slices and the curvature perturbation on uniform-density slices. This expression is a necessary ingredient for calculating observable quantities at second-order and beyond in multiple-field inflation. We show that traditional cosmological perturbation theory and the `separate universe' approach yield equivalent expressions for superhorizon wavenumbers, and in particular that all nonlocal terms can be eliminated from the perturbation-theory expressions.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects:	Q Science > QB Astronomy > QB0980 Cosmogony. Cosmology
Depositing User:	David Seery
Date Deposited:	29 Sep 2015 11:18
Last Modified:	03 Jul 2019 02:22
URI:	http://sro.sussex.ac.uk/id/eprint/56910

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