Observational effects of varying speed of light in quadratic gravity cosmological models
arXiv:1701.06923 · doi:10.1142/S0219887818500846
Abstract
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 () may become variable in that local frame. For theories of the form , this variation in 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, and find that the latter scenario is favored by the data.
References in corpus (23)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- Observation of Gravitational Waves from a Binary Black Hole Merger
- f(R) Theories Of Gravity
- Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
- The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
- Palatini Approach to Modified Gravity: f(R) Theories and Beyond
- Palatini form of 1/R gravity
- Hybrid metric-Palatini gravity
- `c' is the speed of light, isn't it?
- Violation of the Equivalence Principle in Modified Theories of Gravity
- The Cosmology of Ricci-Tensor-Squared Gravity in the Palatini Variational Approach
- Hydrogen atom in Palatini theories of gravity
- Universality of Einstein Equations for the Ricci Squared Lagrangians
- Crystal clear lessons on the microstructure of space-time and modified gravity
- Variable Speed of Light Cosmology, Primordial Fluctuations and Gravitational Waves
- Measuring the speed of light with Baryon Acoustic Oscillations
- Variation of the constants in the late and early universe
- Testing gravity theories using tensor perturbations
- Tensor perturbations in a general class of Palatini theories
- Probing the constancy of the speed of light with future galaxy survey: the case of SKA and Euclid
- Speed of light in the extended gravity theories
- The Palatini formalism for higher-curvature gravity theories