Statistical anisotropy of the curvature perturbation from vector field perturbations

Journal Article · Fri May 15 00:00:00 EDT 2009 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2009/05/013· OSTI ID:22156995

Dimopoulos, Konstantinos; Karciauskas, Mindaugas; Lyth, David H. ^[1]; Rodriguez, Yeinzon ^[2]

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1. Department of Physics, Lancaster University, Lancaster LA1 4YB (United Kingdom)
2. Centro de Investigaciones, Universidad Antonio Narino, Cra 3 Este 47A-15, Bogota D.C. (Colombia)

The {delta}N formula for the primordial curvature perturbation {zeta} is extended to include vector as well as scalar fields. Formulas for the tree-level contributions to the spectrum and bispectrum of {zeta} are given, exhibiting statistical anisotropy. The one-loop contribution to the spectrum of {zeta} 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 {delta}N formula is applied to the vector curvaton and vector inflation models with the tensor perturbation also evaluated in the latter case.

• OSTI ID: 22156995
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 05; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
GAUGE INVARIANCE
INFLATIONARY UNIVERSE
SPECTRA
STATISTICS
VECTOR FIELDS