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Conserved cosmological perturbations.

Lyth, David H. and Wands, David (2003) Conserved cosmological perturbations. Physical Review D – Particles and Fields, 68 (10). 103515 / 10 pages. ISSN 1550-2368

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Abstract

A conserved cosmological perturbation is associated with each quantity whose local evolution is determined entirely by the local expansion of the Universe. It may be defined as the appropriately normalized perturbation of the quantity, defined using a slicing of spacetime such that the expansion between slices is spatially homogeneous. To first order, on superhorizon scales, the slicing with unperturbed intrinsic curvature has this property. A general construction is given for conserved quantities, yielding the curvature perturbation ζ as well as other more recently considered conserved perturbations. The construction may be extended to higher orders in perturbation theory and even into the non-perturbative regime.

Item Type: Article
Journal or Publication Title: Physical Review D – Particles and Fields
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 10452
Deposited By: Mrs Yaling Zhang
Deposited On: 15 Jul 2008 11:08
Refereed?: Yes
Published?: Published
Last Modified: 25 Oct 2013 00:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10452

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