A general proof of the conservation of the curvature perturbation.

Lyth, David H. and Malik, Karim A. and Sasaki, Misao (2005) A general proof of the conservation of the curvature perturbation. Journal of Cosmology and Astroparticle Physics, 0505. 004. ISSN 1475-7516

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Abstract

Without invoking a perturbative expansion, we define the cosmological curvature perturbation, and consider its behaviour assuming that the universe is smooth over a sufficiently large comoving scale. The equations are simple, resembling closely the first-order equations, and they lead to results which generalize those already proven in linear perturbation theory and (in part) in second-order perturbation theory. In particular, the curvature perturbation is conserved provided that the pressure is a unique function of the energy density.

Item Type:	Article
Journal or Publication Title:	Journal of Cosmology and Astroparticle Physics
Additional Information:	This pioneering paper showed that the so-called delta N formalism can be radically generalised, to provide a powerful tool for calculating the non-gaussianity of the primordial perturbation. It has already been used as the starting point for new directions of research by several groups. 78 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics
Uncontrolled Keywords:	cosmological perturbation theory ; inflation ; physics of the early universe
Subjects:	Q Science > QC Physics
Departments:	Faculty of Science and Technology > Physics
ID Code:	2335
Deposited By:	ep_importer
Deposited On:	02 Apr 2008 11:55
Refereed?:	Yes
Published?:	Published
Last Modified:	26 Jul 2012 16:09
Identification Number:
URI:	http://eprints.lancs.ac.uk/id/eprint/2335

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