Doubly-boosted vector cosmologies from disformal metrics

Abstract

A systematic dynamical system approach is applied to study the cosmology of anisotropic Bianchi I universes in which a vector field is assumed to operate on a disformal frame. This study yields a number of new fixed points, among which anisotropic scaling solutions. Within the simplifying assumption of (nearly) constant-slope potentials these are either not stable attractors, do not describe accelerating expansion or else they feature too large anisotropies to be compatible with observations. Nonetheless, some solutions do have an appeal for cosmological applications in that isotropy is retained due to rapid oscillations of the vector field.

11 pages, 4 figures, prepared during the NORDITA Extended Theories of Gravity program. arXiv admin note: substantial text overlap with arXiv:1407.3445

References in corpus (5)

• Inflationary Universe with Anisotropic Hair
• Screening Modifications of Gravity through Disformally Coupled Fields
• Instability of the ACW model, and problems with massive vectors during inflation
• Constraining Disformally Coupled Scalar Fields
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Cited by in corpus (8)

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• Disformally coupled inflation
• Anisotropic inflation with a non-minimally coupled electromagnetic field to gravity
• Dark D-Brane Cosmology: from background evolution to cosmological perturbations
• Anisotropic Scalar Field Dark Energy with a Disformally Coupled Yang-Mills Field
• Stability of disformally coupled accretion disks