Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Statistical anisotropy of the curvature perturbation from vector field perturbations.
AU - Dimopoulos, Konstantinos
AU - Karciauskas, Mindaugas
AU - Lyth, David H.
AU - Rodriguez, Yeinzon
PY - 2009/5/26
Y1 - 2009/5/26
N2 - 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.
AB - 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.
KW - cosmological perturbation theory
KW - inflation
KW - physics of the early universe
KW - power spectrum
UR - http://www.scopus.com/inward/record.url?scp=70349579587&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2009/05/013
DO - 10.1088/1475-7516/2009/05/013
M3 - Journal article
VL - 2009
SP - 013
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 5
ER -