Revisiting metric perturbations in tensor-vector-scalar theory
General Relativity and Quantum Cosmology
2016-05-24 v3 Cosmology and Nongalactic Astrophysics
Abstract
I revisit cosmological perturbations in Bekenstein's tensor-vector-scalar theory (TeVeS). Considering only scalar modes in the conformal Newtonian gauge, the extra degrees of freedom are expressed in a way suitable for studying modifications at the level of the metric potentials. Assuming a universe in the matter-dominated phase, I discuss the mechanism responsible for boosting structure growth, and confirm the vector field as its key ingredient. Using a semi-analytic approach, I further characterize the evolution of density perturbations and the potentials on sub- and superhorizon scales.
Keywords
Cite
@article{arxiv.1203.2891,
title = {Revisiting metric perturbations in tensor-vector-scalar theory},
author = {Martin Feix},
journal= {arXiv preprint arXiv:1203.2891},
year = {2016}
}
Comments
12 pages, 6 figures; updated Figs. 3, 5, and 6, improved discussion of potential and density growth, accepted version