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.Comment: 12 pages, 6 figures; updated Figs. 3, 5, and 6, improved discussion
of potential and density growth, accepted versio
