Date:
10. July 2015 - 11:30 to 12:30
Speaker:
Valerio Faraoni (Bishop's U)
Abstract: Our knowledge of the formation of large-scale structures in the universe relies entirely on numerical simulations. These simulations are Newtonian even though the size of the box used exceeds the Hubble radius and incorrect equations of motion are solved. Does this lead to wrong results? A new approach to this problem is proposed, based on the Hawking-Hayward quasi-local energy of a closed spacelike 2-surface and its splitting into a "Newtonian" part due to local perturbations and a "relativistic" part due to the cosmology. It is found that the Newtonian part quickly dominates over the relativistic one during evolution, supporting the validity of Newtonian simulations.