Turnaround radius in modified gravity
arXiv:1508.00475
Abstract
In an accelerating universe in General Relativity there is a maximum radius above which a shell of test particles cannot collapse, but is dispersed by the cosmic expansion. This radius could be used in conjunction with observations of large structures to constrain the equation of state of the universe. We extend the concept of turnaround radius to modified theories of gravity for which the gravitational slip is non-vanishing.
Clarifications added, bibliography expanded. Matches version accepted for publication in "Physics of the Dark Universe"