The statistically anisotropic curvature perturbation generated by f{sup 2}(φ)F{sub μν}F{sup μν}

Journal Article · Wed May 01 04:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/05/011· OSTI ID:22282863

Lyth, David H. ^[1]; Karčiauskas, Mindaugas ^[2]

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1. Consortium for Fundamental Physics, Cosmology and Astroparticle Group, Department of Physics, Lancaster University, Lancaster LA1 4YB (United Kingdom)
2. CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada-18071 (Spain)

The inflaton might be coupled to a gauge field through a term f{sup 2}(φ)F{sub μν}F{sup μν}. If f∝a{sup −2} where a(t) is the scale factor, the perturbation δW of the gauge field generates a potentially observable statistically anisotropic contribution to the primordial curvature perturbation during slow-roll inflation. The spectrum and bispectrum of this contribution have been calculated using the in-in formalism of quantum field theory. We give a simpler and more complete calculation using only the classical perturbations. The results suggest that either the entire curvature perturbation ζ (both the statistically isotropic and anisotropic parts) is generated during slow-roll inflation, or else it is generated afterwards.

• OSTI ID: 22282863
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
ASTROPHYSICS
INFLATIONARY UNIVERSE
INFLATONS
PERTURBATION THEORY
POTENTIALS
QUANTUM FIELD THEORY