Model of dark matter and dark energy based on gravitational polarization

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.024031· OSTI ID:21250381

Blanchet, Luc; Le Tiec, Alexandre ^[1]

---

1. GRECO, Institut d'Astrophysique de Paris-UMR 7095 du CNRS, Universite Pierre and Marie Curie, 98 bis boulevard Arago, 75014 Paris (France)

A model of dark matter and dark energy based on the concept of gravitational polarization is investigated. We propose an action in standard general relativity for describing, at some effective or phenomenological level, the dynamics of a dipolar medium, i.e. one endowed with a dipole moment vector, and polarizable in a gravitational field. Using first-order cosmological perturbations, we show that the dipolar fluid is undistinguishable from standard dark energy (a cosmological constant {lambda}) plus standard dark matter (a pressureless perfect fluid), and therefore benefits from the successes of the {lambda}-cold-dark-matter scenario at cosmological scales. Invoking an argument of 'weak clusterization' of the mass distribution of dipole moments, we find that the dipolar dark matter reproduces the phenomenology of the modified Newtonian dynamics at galactic scales. The dipolar medium action naturally contains a cosmological constant, and we show that if the model is to come from some fundamental underlying physics, the cosmological constant {lambda} should be of the order of a{sub 0}{sup 2}/c{sup 4}, where a{sub 0} denotes the modified Newtonian dynamics constant acceleration scale, in good agreement with observations.

• OSTI ID: 21250381
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
ACCELERATION
COSMOLOGICAL CONSTANT
DIPOLE MOMENTS
DISTURBANCES
FLUIDS
GENERAL RELATIVITY THEORY
GRAVITATIONAL FIELDS
IDEAL FLOW
MASS DISTRIBUTION
NONLUMINOUS MATTER
PERTURBATION THEORY
POLARIZATION