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gr-qc2017
Kerr principal null directions from Bel--Robinson and Kummer surfaces
Jens Boos, Alberto Favaro
In the Kerr geometry, we calculate various surfaces of constant curvature invariants. These extend well beyond the Kerr horizon, and we argue that they might be of observational si…
gr-qc2014★ 19 cited
The Kummer tensor density in electrodynamics and in gravity
Peter Baekler, Alberto Favaro, Yakov Itin +1
Guided by results in the premetric electrodynamics of local and linear media, we introduce on 4-dimensional spacetime the new abstract notion of a Kummer tensor density of rank fou…
gr-qc2014★ 2 cited
Fresnel versus Kummer surfaces: geometrical optics in dispersionless linear (meta)materials and vacuum
Alberto Favaro, Friedrich W. Hehl
Geometrical optics describes, with good accuracy, the propagation of high-frequency plane waves through an electromagnetic medium. Under such approximation, the behaviour of the el…