Lyth, David H. and Wands, David (2003) Conserved cosmological perturbations. Physical Review D – Particles and Fields, 68 (10). 103515 / 10 pages.Full text not available from this repository.
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.
|Journal or Publication Title:||Physical Review D – Particles and Fields|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited By:||Mrs Yaling Zhang|
|Deposited On:||15 Jul 2008 11:08|
|Last Modified:||26 Jul 2012 14:48|
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