Vector Field Models of Inflation and Dark Energy

Details Vector Field Models of Inflation and Dark Energy Vector Field Models of Inflation and Dark Energy

2008-05-27

arxiv.org/abs/0805.4229v3

JCAP 0808:021,2008

Astronomy and Astrophysics

Astrophysics

24 pages, 2 figures; JCAP in print

Scientific paper

10.1088/1475-7516/2008/08/021

We consider several new classes of viable vector field alternatives to the inflaton and quintessence scalar fields. Spatial vector fields are shown to be compatible with the cosmological anisotropy bounds if only slightly displaced from the potential minimum while dominant, or if driving an anisotropic expansion with nearly vanishing quadropole today. The Bianchi I model with a spatial field and an isotropic fluid is studied as a dynamical system, and several types of scaling solutions are found. On the other hand, time-like fields are automatically compatible with large-scale isotropy. We show that they can be dynamically important if non-minimal gravity couplings are taken into account. As an example, we reconstruct a vector-Gauss-Bonnet model which generates the concordance model acceleration at late times and supports an inflationary epoch at high curvatures. The evolution of vortical perturbations is considered.

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