Cosmology in Delta-Gravity

Abstract

We present a model of the gravitational field based on two symmetric tensors. Gravity is affected by the new field, but outside matter the predictions of the model coincide exactly with general relativity, so all classical tests are satisfied. We find that massive particles do not follow a geodesic while massless particles trajectories are null geodesics of an effective metric. We study the Cosmological case, where we get an accelerated expansion of the universe without dark energy. We also introduce the possibility to explain dark matter with $\tilde{\delta }$ gravity.

latex, 18 pages. arXiv admin note: text overlap with arXiv:1006.5765

References in corpus (6)

• Dark Energy and the Accelerating Universe
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
• Modified gravity models of dark energy
• Strategies for Determining the Nature of Dark Matter
• Spontaneous generation of geometry in four dimensions

Cited by in corpus (6)

• Phantom fluid supporting traversable wormholes in alternative gravity with extra material terms
• Testing the mapping between redshift and cosmic scale factor
• Redshift remapping and cosmic acceleration in dark-matter-dominated cosmological models
• Observational constraints in Delta Gravity: CMB and supernovas
• An Accelerating Universe without Lambda: Delta~Gravity Using Monte Carlo
• Optical theorem and indefinite metric in $\lambda {\varphi }^4$ delta-theory