In this talk, I will first briefly discuss the challenges one faces when trying to explain the late-time acceleration of our Universe from large-scale structure observations, and how those can be overcome by identifying the appropriate observables on the sky. In this context, I will then explain how future observational surveys will provide us with a unique opportunity to to find out whether the law of gravity is truly modified at large scales. I will then describe a fundamental, underlying relation between large-scale modifications of gravity and the propagation of gravitational waves, as well as its observational implications for cosmology and astrophysics.
2015 November 05, 15:00
Observatůrio Astronůmico de Lisboa (Seminar room)
Tapada da Ajuda, 1349-018 Lisboa