6 papers
Weighing the curvature invariants
Jan DragaÅ¡eviÄ, Ina Moslavac, Ivica SmoliÄ
We prove several inequalities between the curvature invariants, which impose constraints on curvature singularities. Some of the inequalities hold for a family of spacetimes which…
Noncommutative quasinormal modes of Schwarzschild black hole
Nikola Herceg, Tajron JuriÄ, A. Naveena Kumara +2
We study gravitational perturbations of the Schwarzschild metric in the context of noncommutative gravity. and noncommutativity are introduced through a Moyal twist of…
Generalized Runcorn's theorem and crustal magnetism
Ivica SmoliÄ
During the era of NASA's Apollo missions, Keith S. Runcorn proposed an explanation of discrepancy between the Moon's negligible global magnetic field and magnetized samples of luna…
Lorentz contraction of electric field lines for a point charge in uniform motion
Petar Žugec, Davor HorvatiÄ, Ivica SmoliÄ
We examine a logical foundation of depicting a Lorentz contraction of a Coulomb field (an electric field of a point charge in uniform motion) by means of the 'Lorentz contracted' f…
Noncommutative Reissner-Nordström black hole from noncommutative charged scalar field
Marija DimitrijeviÄ ÄiriÄ, Tajron JuriÄ, Nikola Konjik +2
Within the framework of noncommutative (NC) deformation of gauge field theory by the angular twist, we first rederive the NC scalar and gauge field model from our previous papers a…
Near-horizon aspects of black holes in quantum spacetime
Nikola Herceg, Tajron JuriÄ, A. Naveena Kumara +2
We give a short introduction to the formalism of noncommutative (twisted) differential geometry that is used to derive the equations of motion for the gravitational perturbation of…