Particle Production of Vector Fields: Scale Invariance is Attractive

Wagstaff, Jacques and Dimopoulos, Konstantinos (2011) Particle Production of Vector Fields: Scale Invariance is Attractive. Physical Review D, 83 (2). ISSN 1550-7998

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In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared it is demonstrated that, under fairly general conditions during inflation, a scale-invariant spectrum of perturbations for the components of a vector field, massive or not, whose kinetic function (and mass) is modulated by the inflaton field is an attractor solution. If the field is massless, or if it remains light until the end of inflation, this attractor solution also generates anisotropic stress, which can render inflation weakly anisotropic. The above two characteristics of the attractor solution can source (independently or combined together) significant statistical anisotropy in the curvature perturbation, which may well be observable in the near future.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
arXiv:1011.2517 [hep-ph] © 2011 American Physical Society
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Deposited On:
23 Jan 2012 11:22
Last Modified:
21 Nov 2022 22:02