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Disformal vectors and anisotropies on a warped brane Hulluilla on Halvat Huvit
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 2
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 3, 003Article in journal (Refereed) Published
Abstract [en]

The Maxwell action is conformally invariant and classically ignorant of conformally flat metrics. However, if the vector lives in a disformal metric - as it does if residing upon a moving brane - this is no longer true. The disformal coupling is then mediated by a Dirac-Born-Infeld scalar field. Here a systematic dynamical system analysis is developed for anisotropic Bianchi I cosmology with a massive disformally coupled vector field. Several new fixed points are found, including anisotropic scaling solutions. The formalism here presented can be conveniently applied to general scenarios with or without extra dimensional motivations. This is illustrated here by performing a complete analysis with the assumption that both the potentials and the warp factor for the brane are (nearly) exponential. In that case, the anisotropic fixed points are either not attractors, do not describe accelerating expansion or else they feature too large anisotropies to be compatible with observations. Nonetheless, viable classes of models exist where isotropy is retained due to rapid oscillations of the vector field, thus providing a possible realisation of disformally interacting massive dark matter.

Place, publisher, year, edition, pages
2015. no 3, 003
Keyword [en]
gravity, cosmology of theories beyond the SM, cosmology with extra dimensions, string theory and cosmology
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-119013DOI: 10.1088/1475-7516/2015/03/003ISI: 000355633800003OAI: diva2:843292
Available from: 2015-07-28 Created: 2015-07-24 Last updated: 2015-07-28Bibliographically approved

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ReferencesLink to record
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