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.
Cite
@article{arxiv.1503.01684,
title = {Doubly-boosted vector cosmologies from disformal metrics},
author = {Tomi S. Koivisto and Federico R. Urban},
journal= {arXiv preprint arXiv:1503.01684},
year = {2015}
}
Comments
11 pages, 4 figures, prepared during the NORDITA Extended Theories of Gravity program. arXiv admin note: substantial text overlap with arXiv:1407.3445