General relativisitic, nonstrandard model for the dark sector of the Universe

Stichel, P.C.; Zakrzewski, W.J.

Abstract

We present a general relativistic version of the self-gravitating fluid model for the dark sector of the Universe (darkon fluid) introduced in Stichel and Zakrzewski (Phys Rev D 80:083513, 2009) and extended and reviewed in Stichel and Zakrzewski (Entropy 15:559, 2013). This model contains no free parameters in its Lagrangian. The resulting energy-momentum tensor is dustlike with a nontrivial energy flow. In an approximation valid at sub-Hubble scales we find that the present-day cosmic acceleration is not attributed to any kind of negative pressure but it is due to a dynamically determined negative energy density. This property turns out to be equivalent to a time-dependent spatial curvature. The obtained cosmological equations, at sub-Hubble scales, agree with those of the nonrelativistic model but they are given a new physical interpretation. Furthermore, we have derived the self-consistent equation to be satisfied by the nonrelativistic gravitational potential produced by a galactic halo in our model from a weak-field limit of a generalized Tolman–Oppenheimer–Volkoff equation.

Citation

Stichel, P., & Zakrzewski, W. (2015). General relativisitic, nonstrandard model for the dark sector of the Universe. The European Physical Journal C, 75(1), Article 9. https://doi.org/10.1140/epjc/s10052-014-3218-3

• Journal Article Type: Article
• Acceptance Date: Dec 4, 2014
• Online Publication Date: Jan 14, 2015
• Publication Date: Jan 14, 2015
• Deposit Date: Jan 29, 2015
• Publicly Available Date: Nov 10, 2016
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 75
• Issue: 1
• Article Number: 9
• DOI: https://doi.org/10.1140/epjc/s10052-014-3218-3
• Public URL: https://durham-repository.worktribe.com/output/1415867