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Geodesic explorations in the gravimagnetic dipole spacetime: effective potentials for gravity's attraction by Clémentine Dassy -
Jeudi 27 août 2026 à 15h00 - Auditoire CYCL01 - Bâtiment de Hemptinne - Chemin du Cyclotron, 2 - 1348 Louvain-la-Neuve -
This thesis investigates geodesic motion, for both massive and massless particles, in a specific asymptotically flat, stationary, and axisymmetric spacetime solution to the vacuum Einstein equations: the gravimagnetic dipole. Under a certain choice of parameters, this solution models two equal-mass black holes with opposite NUT charges, co-rotating around a shared axis and connected by a tensionless Misner string. The study focuses on circular geodesics and lensing effects, revealing rich and counter-intuitive dynamics. To bypass computationally intensive numerical methods, original semi-analytical techniques, based on effective potentials, were developed. This work provides a first-of-its-kind exploration of such configurations, offering new perspectives on their geometric and physical properties.
Jury members :
Prof. Jan Govaerts (UCLouvain) (Supervisor)
Prof. Philippe Ruelle (UCLouvain) (Chairperson)
Prof. Giacomo Bruno (UCLouvain) (Secretary)
Prof. Geoffrey Compère (ULB)
Prof. Andrea Campoleoni (UMons)
Pay attention : the public defense of Clémentine Dassy will also take place in the form of a videoconference
