Cosmological acceleration, varying couplings, and Lorentz breaking
Abstract
Many candidate fundamental theories contain scalar fields that can acquire spacetimevarying expectation values in a cosmological context. Such scalars typically obey Lorentzviolating effective dispersion relations. We illustrate this fact within a simple supergravity model that also exhibits the observed latetime cosmological acceleration and implies varying electromagnetic couplings.
 Publication:

Physical Review D
 Pub Date:
 April 2004
 DOI:
 10.1103/PhysRevD.69.083513
 arXiv:
 arXiv:astroph/0310344
 Bibcode:
 2004PhRvD..69h3513B
 Keywords:

 98.80.Cq;
 04.65.+e;
 11.30.Cp;
 12.60.i;
 Particletheory and fieldtheory models of the early Universe;
 Supergravity;
 Lorentz and Poincare invariance;
 Models beyond the standard model;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 11 pages, 9 figures, 1 table