Lyth, David H. and Wands, D. (2002) Generating the curvature perturbation without an inflation. Physics Letters B, 524 (1-2). pp. 5-14.Full text not available from this repository.
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.
|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|
|Deposited On:||02 Apr 2008 11:49|
|Last Modified:||07 Jan 2015 13:46|
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