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Second order cosmological perturbations: simplified gauge change formulas
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0002-0906-8808
University of Waterloo, Canada.
2019 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 36, no 3, p. 1-19, article id 035004Article in journal (Refereed) Published
Abstract [en]

In this paper we present a new formulation of the change of gauge formulas in second order cosmological perturbation theory which unifies and simplifies known results. Our approach is based on defining new second order scalar perturbation variables by adding a multiple of the square of the corresponding first order variables to each second order variable. A bonus is that these new perturbation variables are of broader significance in that they also simplify the analysis of second order scalar perturbations in the super-horizon regime in a number of ways, and lead to new conserved quantities.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019. Vol. 36, no 3, p. 1-19, article id 035004
Keywords [en]
cosmology, perturbations, gauge
National Category
Probability Theory and Statistics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-71074DOI: 10.1088/1361-6382/aaf924ISI: 000455932900002OAI: oai:DiVA.org:kau-71074DiVA, id: diva2:1288802
Available from: 2019-02-14 Created: 2019-02-14 Last updated: 2019-02-18Bibliographically approved

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Uggla, Claes

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