Cosmological acceleration, varying couplings, and Lorentz breaking
classification
🌌 astro-ph
gr-qchep-phhep-th
keywords
cosmologicalaccelerationcouplingsvaryingacquirebreakingcandidatecontain
read the original 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.
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