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Generating the curvature perturbation without an inflation.

Lyth, David H. and Wands, D. (2002) Generating the curvature perturbation without an inflation. Physics Letters B, 524 (1-2). pp. 5-14.

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Abstract

We present a mechanism for the origin of the large-scale curvature perturbation in our Universe by the late decay of a massive scalar field, the curvaton. The curvaton is light during a period of cosmological inflation, when it acquires a perturbation with an almost scale-invariant spectrum. This corresponds initially to an isocurvature density perturbation, which generates the curvature perturbation after inflation when the curvaton density becomes a significant fraction of the total. The isocurvature density perturbation disappears if the curvaton completely decays into thermalised radiation. Any residual isocurvature perturbation is 100% correlated with the curvature. The same mechanism can also generate the curvature perturbation in pre-big bang/ekpyrotic models, provided that the curvaton has a suitable non-canonical kinetic term so as to generate a flat spectrum.

Item Type: Article
Journal or Publication Title: Physics Letters B
Additional Information: This agenda-setting paper proposed a radical modification of the inflationary scenario, whereby the field responsible for the origin of structure in the universe may lie dormant until a rather late epoch. This 'curvaton' mechanism opened the way to new ways of thinking about the early universe. 353 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2333
Deposited By: ep_importer
Deposited On: 02 Apr 2008 11:49
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2333

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