Sigma-Model Aether

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dc.creatorCarroll, Sean M.
dc.creatorDulaney, Timothy R.
dc.creatorGresham, Moira I.
dc.creatorTam, Heywood
dc.date2008-12-05
dc.date2009-01-16
dc.date.accessioned2026-07-07T12:54:40Z
dc.date.available2026-07-07T12:54:40Z
dc.descriptionTheories of low-energy Lorentz violation by a fixed-norm "aether" vector field with two-derivative kinetic terms have a globally bounded Hamiltonian and are perturbatively stable only if the vector is timelike and the kinetic term in the action takes the form of a sigma model. Here we investigate the phenomenological properties of this theory. We first consider the propagation of modes in the presence of gravity, and show that there is a unique choice of curvature coupling that leads to a theory without superluminal modes. Experimental constraints on this theory come from a number of sources, and we examine bounds in a two-dimensional parameter space. We then consider the cosmological evolution of the aether, arguing that the vector will naturally evolve to be orthogonal to constant-density hypersurfaces in a Friedmann-Robertson-Walker cosmology. Finally, we examine cosmological evolution in the presence of an extra compact dimension of space, concluding that a vector can maintain a constant projection along the extra dimension in an expanding universe only when the expansion is exponential.
dc.description8 pages, 2 figures; fixed minor typo and changed references in v2
dc.identifierhttps://arxiv.org/abs/0812.1050
dc.identifierhttp://arxiv.org/abs/0812.1050
dc.identifierPhys.Rev.D79:065012,2009
dc.identifierdoi:10.1103/PhysRevD.79.065012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224014
dc.subjectHigh Energy Physics - Theory
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleSigma-Model Aether
dc.typetext

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