The curvature perturbation at second order

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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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

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Project NameSussex Project NumberFunderFunder Ref
Precisions tests of the inflationary scenarioG0918EUROPEAN UNION308082