Cosmological acceleration, varying couplings, and Lorentz breaking
- 16 April 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 69 (8) , 083513
- https://doi.org/10.1103/physrevd.69.083513
Abstract
Many candidate fundamental theories contain scalar fields that can acquire spacetime-varying expectation values in a cosmological context. Such scalars typically obey Lorentz-violating effective dispersion relations. We illustrate this fact within a simple supergravity model that also exhibits the observed late-time cosmological acceleration and implies varying electromagnetic couplings.Keywords
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