The curvature perturbation at second order
| Autor: | Mafalda Dias, Joseph Elliston, David Seery, Jonathan Frazer, David J. Mulryne |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
High Energy Physics - Theory
Physics Inflation (cosmology) Cosmology and Nongalactic Astrophysics (astro-ph.CO) media_common.quotation_subject FOS: Physical sciences Order (ring theory) Astronomy and Astrophysics Observable Curvature perturbation General Relativity and Quantum Cosmology (gr-qc) General Relativity and Quantum Cosmology Expression (mathematics) Universe High Energy Physics - Theory (hep-th) QB0980 Cosmological perturbation theory Wavenumber Astrophysics - Cosmology and Nongalactic Astrophysics Mathematical physics media_common |
| ISSN: | 1475-7516 |
| Popis: | 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. Comment: 16 pages, no figures. This is an author-created, un-copyedited version of an article published in JCAP. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1475-7516/2015/02/040. v3: Updated to match version published in JCAP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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