Dec 13 – 18, 2015
International Conference Centre Geneva
Europe/Zurich timezone

Backrection of voids in a Friedman background with constant w equation of state.

Dec 14, 2015, 2:42 PM
Level 2, Room 13 (International Conference Centre Geneva)

Level 2, Room 13

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Marco Bruni (University of Portsmouth)


I introduce new exact solutions of the Szekeres-Szafron type describing voids on a Friedmann-Roberson-Walker background with w=constant equation of state. At least in the linear regime the inhomogeneities can be thought of as large scale perturbations of the background. Using these exact solutions the averaged quantities of the Buchert scheme can be calculated exactly. I show that in general the late-time evolution is dominated by the voids: these back-react in such a way that the average expansion is significantly different from the background one, I will describe how.

Primary author

Marco Bruni (University of Portsmouth)

Presentation materials