Speaker
Valerio Faraoni
(Bishop's University)
Description
In an accelerating universe there is a maximum radius above which a shell of test particles cannot collapse and 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 express the turnaround radius in general relativity in terms of the Hawking quasilocal mass and we extend the concept to
modified theories of gravity for which the gravitational slip is non-vanishing.
[Based on V. Faraoni, M. Lapierre-Leonard & A. Prain 2015, JCAP 10, 013; V. Faraoni 2016, Phys. Dark Universe 11, 11]
Primary author
Valerio Faraoni
(Bishop's University)
