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

Abstract: 

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.