Speaker
Description
What happens when gravitational waves encounter a massive astrophysical object? Gravitational lensing, traditionally seen with light, bends and distorts gravitational waves as a result of the object’s gravity. Gravitational lensing can be a useful tool to learn more about the nature and the properties of these astrophysical objects (gravitational lenses), and is expected to distort gravitational waves as well. Although ~300 gravitational wave event candidates have been detected since 2015, a gravitationally-lensed signal has not been confidently observed yet, but it is expected to arrive at any moment. I will discuss how these events can be modelled: in particular, how interference and diffraction around the lens affect the signal, giving rise to characteristic features. I will also discuss how lensing of gravitational waves emitted in the same environment as the lens can help us distinguish the origin of the signal.
