Statistical anisotropy of the curvature perturbation from vector field perturbations.

Dimopoulos, Konstantinos and Karciauskas, Mindaugas and Lyth, David H. and Rodriguez, Yeinzon (2009) Statistical anisotropy of the curvature perturbation from vector field perturbations. Journal of Cosmology and Astroparticle Physics, 2009 (5). 013. ISSN 1475-7516

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Abstract

The δN formula for the primordial curvature perturbation ζ is extended to include vector as well as scalar fields. Formulas for the tree-level contributions to the spectrum and bispectrum of ζ are given, exhibiting statistical anisotropy. The one-loop contribution to the spectrum of ζ is also worked out. We then consider the generation of vector field perturbations from the vacuum, including the longitudinal component that will be present if there is no gauge invariance. Finally, the δN formula is applied to the vector curvaton and vector inflation models with the tensor perturbation also evaluated in the latter case.

Item Type: Journal Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 26899
Deposited By: Dr Konstantinos Dimopoulos
Deposited On: 14 Aug 2009 08:23
Refereed?: Yes
Published?: Published
Last Modified: 06 Aug 2019 00:46
URI: https://eprints.lancs.ac.uk/id/eprint/26899

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