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Strong gravitational lensing by a charged Kiselev black hole
(2017)
We study the gravitational lensing scenario where the lens is a spherically symmetric charged black hole (BH) surrounded by quintessence matter. The null geodesic equations in the curved background of the black hole are ...
Orderings and flexibility of some subgroups of Homeo(+)(R)
(2017)
In this work we exhibit flexibility phenomena for some (countable) groups acting by order preserving homeomorphisms of the line. More precisely, we show that if a left orderable group admits an amalgam decomposition of the ...