Gravitational instability in oscillating background
arXiv:1507.02152 · doi:10.1103/PhysRevD.92.064041
Abstract
Evolution of density and metric perturbations in the background of high frequency oscillations of curvature in F(R) gravity is considered. In addition to the usual Jeans-like instability new effects of amplification of perturbations, associated with parametric resonance and antifriction phenomena, are found.
21 pages, 14 figures