31 citations · 132 across the 17 of their papers we have counts for
27 papers
Astrophysical cloaking of a naked singularity
Ronaldo S. S. Vieira, Włodek Kluźniak
A massive naked singularity would be cloaked by accreted matter, and thus may appear to a distant observer as an opaque \mbox{(quasi-)}spherical surface of a fluid, not unlike that…
Envelopes for orbits around axially symmetric sources with spheroidal shape
Javier Ramos-Caro, Ronaldo S. S. Vieira
We introduce a method to obtain the envelopes of eccentric orbits in axially symmetric potentials, , endowed with -symmetry of reflection. By making the transformation $…
Chaotic dynamics of a spinless axisymmetric extended body around a Schwarzschild black hole
Ricardo A. Mosna, Fernanda F. Rodrigues, Ronaldo S. S. Vieira
We investigate the long-term orbital dynamics of spinless extended bodies in Schwarzschild geometry, and show that periodic deviations from spherical symmetry in the shape of a tes…
Homoclinic chaos in the Hamiltonian dynamics of extended test bodies
Ronaldo S. S. Vieira, Ricardo A. Mosna
There is a long tradition of studying chaotic trajectories in systems whose integrability is broken by means of an external perturbation. Here we explore a different route to chaos…
Chaotic orbital dynamics of pulsating objects in dark matter halos
Ronaldo S. S. Vieira, Ricardo A. Mosna
Stellar pulsation is nowadays a widely understood subject. However, there has been no research about the effects of pulsations on the star's orbital dynamics throughout the galaxy.…
Levitating atmospheres around naked singularities
Ronaldo S. S. Vieira, Włodek Kluźniak
For a wide class of spherically symmetric naked singularities there is a sphere within which gravity is effectively repulsive. In such spacetimes accreting matter cannot reach the…