Journal
PHYSICAL REVIEW D
Volume 85, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.044044
Keywords
-
Funding
- STFC [ST/J000388/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000388/1] Funding Source: researchfish
Ask authors/readers for more resources
Modified Newtonian dynamics is an empirical modification to Poisson's equation which has had success in accounting for the gravitational field'' Phi in a variety of astrophysical systems. The field Phi may be interpreted in terms of the weak-field limit of a variety of spacetime geometries. Here we consider three of these geometries in a more comprehensive manner and look at the effect on timelike and null geodesics. In particular we consider the aquadratic Lagrangian (AQUAL) theory, tensor-vector-scalar (TeVeS) theory and generalized Einstein-aether theory. We uncover a number of novel features, some of which are specific to the theory considered while others are generic. In the case of AQUAL and TeVeS theories, the spacetime exhibits an excess (AQUAL) or deficit TeVeS solid angle akin to the case of a Barriola-Vilenkin global monopole. In the case of generalized Einstein-aether, a disformal symmetry of the action emerges in the limit of (Delta) over right arrow Phi -> 0. Finally, in all theories studied, massive particles can never reach spatial infinity while photons can do so only after experiencing infinite redshift.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available