Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-09-26
Class.Quant.Grav.24:3541-3570,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
33 pages, 6 figures, to appear in Classical and Quantum Gravity
Scientific paper
10.1088/0264-9381/24/14/002
The dynamics of "dipolar particles", i.e. particles endowed with a four-vector mass dipole moment, is investigated using an action principle in general relativity. The action is a specific functional of the particle's world line, and of the dipole moment vector, considered as a dynamical variable. The first part of the action is inspired by that of a particle with spin moving on an arbitrary gravitational background. The second part is intended to describe, at some effective level, the internal non-gravitational force linking together the "microscopic" constituents of the dipole. We find that some solutions of the equations of motion and evolution of the dipolar particles correspond to an equilibrium state for the dipole moment in a gravitational field. Under some hypothesis we show that a fluid of dipolar particles, supposed to constitute the dark matter, reproduces the modified Newtonian dynamics (MOND) in the non relativistic limit. We recover the main characteristics of a recently proposed quasi-Newtonian model of "gravitational polarization".
No associations
LandOfFree
Dipolar Particles in General Relativity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dipolar Particles in General Relativity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dipolar Particles in General Relativity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-261113