Dipolar Dark Matter and Dark Energy

TL;DR

This paper refines a gravitational polarization model of dark matter and dark energy, demonstrating its formulation within general relativity and its consistency with cosmological and galactic observations.

Contribution

It presents a simplified, physically meaningful matter action for the model and offers alternative derivations of its main results.

Findings

Model recovers Lambda-CDM at cosmological scales

Replicates MOND phenomenology at galactic scales

Provides a clearer formulation within general relativity

Abstract

In previous work [L. Blanchet and A. Le Tiec, Phys. Rev. D 78, 024031 (2008)], a model of dark matter and dark energy based on the concept of gravitational polarization was investigated. This model was shown to recover the concordance cosmological scenario (Lambda-CDM) at cosmological scales, and the phenomenology of the modified Newtonian dynamics (MOND) at galactic scales. In this article we prove that the model can be formulated with a simple and physically meaningful matter action in general relativity. We also provide alternative derivations of the main results of the model, and some details on the variation of the action.