Gravity Seminars

Gravitational waves (GWs) allow us to probe the content of the Universe and the behaviour of gravity on cosmological scales, through information contained in their propagation. In this talk, I will discuss particular cosmological scenarios where GWs interact with another tensor-like field, such as in the theory of massive bigravity. I will illustrate explicitly how the GW signal from a coalescence of black holes evolves during cosmological propagation, which could exhibit phase distortions and echoes of the GW signal emitted. These strong features suggest that stringent constraints on interacting GWs can be placed with current and future GW detectors.