Lunch talk on Apr. 6, 2022
Gravitational Lensing in the NUT Spacetime
Speaker: Torben Frost (University of Bremen)
Venue: Video Conference
Time: 16:00 PM, Wednesday, Apr. 6, 2022
The existence of a gravitomagnetic charge, the gravitational analogon to a hypothetical magnetic charge in electrodynamics, is a long-standing open question in physics. In my talk I will discuss how we can use gravitational lensing to identify if a black hole in nature carries a gravitomagnetic charge. For this purpose I will assume that they are described by the NUT metric. We will solve the geodesic equations using Legendre's elliptic integrals and Jacobi's elliptic functions. Then we will rederive the angular radius of the shadow, formulate a lens equation, derive redshift and travel time.