Spinning generalizations of Majumdar-Papapetrou multi-black-hole spacetimes: Light rings, lensing, and shadows
Year: 2025
Type: article
Abstract: A generalization of the Majumdar-Papapetrou multi-black-hole spacetime was recently constructed by Teo and Wan [Phys. Rev. D 109, 044054 (2024)], describing charged and spinning (extremal) balanced black holes in asymptotically flat spacetime. We explore the dynamics of null geodesics on this geometry, focusing on the two-center solution. Using the topological charge formalism, we show that various light ring arrangements arise from different choices of individual angular momenta: light rings with opposite topological charges can merge and annihilate each other, resulting in configurations with a total of 4, 6, or 8 light rings. Using backward ray tracing, we obtained the shadow and lensing of these spacetimes. The former, in particular, closely resembles those for the double Kerr metric.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Universidade de Aveiro, CERN, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Amazônia Paraense de Amparo à Pesquisa, Center for Research and Development in Mathematics and Applications, HORIZON EUROPE Framework Programme, Fundação para a Ciência e a Tecnologia, HORIZON EUROPE Marie Sklodowska-Curie Actions
Awards: G1408793081, G29316538, Testando a hipótese de Kerr com ondas e lentes gravitacionais, G3595636137, G3889861187, G4232096390, G4395959759, G4479787952, Rumo a testes de precisão de matéria escura ultraleve com ondas e imagiologia gravitacionais, G5788466760, G6997658380, Ondas gravitacionais, buracos negros, e física fundamental, G7410001724, G96128828
OpenAlex ID: W4409076157