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Article

Caustics in Gravitational Lensing by Mixed Binary Systems

1
Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy
2
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Via Cintia, 80126 Napoli, Italy
3
Miur: Ministero dell’Istruzione, dell’Università e della Ricerca, 00153 Roma, Italy
*
Author to whom correspondence should be addressed.
Universe 2020, 6(8), 106; https://doi.org/10.3390/universe6080106
Received: 22 June 2020 / Revised: 25 July 2020 / Accepted: 29 July 2020 / Published: 31 July 2020
(This article belongs to the Special Issue Gravitational Lensing and Optical Geometry: A Centennial Perspective)
We investigated binary lenses with 1/rn potentials in the asymmetric case with two lenses with different indexes n and m. These kinds of potentials have been widely used in several contexts, ranging from galaxies with halos described by different power laws to lensing by wormholes or exotic matter. In this paper, we present a complete atlas of critical curves and caustics for mixed binaries, starting from the equal-strength case, and then exploring unequal-strength systems. We also calculate the transitions between all different topology regimes. Finally we find some useful analytic approximations for the wide binary case and for the extreme unequal-strength case. View Full-Text
Keywords: gravitational lensing; black holes; wormholes; galaxies gravitational lensing; black holes; wormholes; galaxies
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MDPI and ACS Style

Bozza, V.; Pietroni, S.; Melchiorre, C. Caustics in Gravitational Lensing by Mixed Binary Systems. Universe 2020, 6, 106. https://doi.org/10.3390/universe6080106

AMA Style

Bozza V, Pietroni S, Melchiorre C. Caustics in Gravitational Lensing by Mixed Binary Systems. Universe. 2020; 6(8):106. https://doi.org/10.3390/universe6080106

Chicago/Turabian Style

Bozza, Valerio, Silvia Pietroni, and Chiara Melchiorre. 2020. "Caustics in Gravitational Lensing by Mixed Binary Systems" Universe 6, no. 8: 106. https://doi.org/10.3390/universe6080106

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