Le 13 mars 2015
De 10h30 à 12h00
Ippocratis SALTAS
Center of Astronomy and Astrophysics, University of Lisbon, Portugal
The main topic of this talk will be the challenges one faces when trying to explain the observed late-time acceleration of our Universe both from a theoretical and an observational point of view. In particular, I will discuss about the obstacles which the yet unkown physics of dark energy and dark matter place when we try to understand the correct theory of gravity at large scales, and how those can be overcome by identifying the appropriate observables on the sky. In this context, I will further explain how future observational surveys will allow us to find out whether gravity is truly modified at large scales, and will discuss about a fundamental, underlying relation between large-scale modifications of gravity and the (non-trivial) propagation of gravitational waves, as well as its observational implications for cosmology and astrophysics.