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The curvature perturbation at second order
journal contribution
posted on 2023-06-08, 22:37 authored by Mafalda Dias, Joseph Elliston, Jonathan Frazer, David Mulryne, David SeeryDavid SeeryWe 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.
Funding
Precisions tests of the inflationary scenario; G0918; EUROPEAN UNION; 308082
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- Published
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- Published version
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Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516Publisher
Institute of PhysicsExternal DOI
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2015Department affiliated with
- Physics and Astronomy Publications
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- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2015-09-29First Open Access (FOA) Date
2016-03-01First Compliant Deposit (FCD) Date
2015-09-29Usage metrics
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