Speaker
Prof.
Valerio Faraoni
(Bishop's University)
Description
In an accelerating universe a maximum radius exists above which a shell of test particles cannot collapse and disperses due to the cosmic expansion. Observations of this turnaround radius for large structures could constrain the
effective equation of state of dark energy. We use the Hawking quasilocal mass to make the concept of turnaround radius well defined in general relativity and
then we extend it 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
Prof.
Valerio Faraoni
(Bishop's University)
