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 |
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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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📧 Request an updateProject Name | Sussex Project Number | Funder | Funder Ref |
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Precisions tests of the inflationary scenario | G0918 | EUROPEAN UNION | 308082 |