6533b7d0fe1ef96bd125aec8
RESEARCH PRODUCT
Observational effects of varying speed of light in quadratic gravity cosmological models
Azam IzadiShadi Sajedi ShackerRobi BanerjeeGonzalo J. OlmoGonzalo J. Olmosubject
PhysicsGravity (chemistry)Physics and Astronomy (miscellaneous)010308 nuclear & particles physicsFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Cosmological constantAffine connectionType (model theory)01 natural sciencesGeneral Relativity and Quantum Cosmology0103 physical sciencesSpeed of lightConnection (algebraic framework)010306 general physicsConstant (mathematics)Luminosity distanceMathematical physicsdescription
We study different manifestations of the speed of light in theories of gravity where metric and connection are regarded as independent fields. We find that for a generic gravity theory in a frame with locally vanishing affine connection, the usual degeneracy between different manifestations of the speed of light is broken. In particular, the space-time causal structure constant ([Formula: see text]) may become variable in that local frame. For theories of the form [Formula: see text], this variation in [Formula: see text] has an impact on the definition of the luminosity distance (and distance modulus), which can be used to confront the predictions of particular models against Supernovae type Ia (SN Ia) data. We carry out this test for a quadratic gravity model without cosmological constant assuming (i) a constant speed of light and (ii) a varying speed of light (VSL), and find that the latter scenario is favored by the data.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-23 |