3 papers
gr-qc2025
Light rings, timelike circular orbits and curvature of traversable wormholes
Boris Bermúdez-Cárdenas, Oscar Lasso Andino
We study the existence of light rings (LR's) and timelike circular orbits (TCO's) in spherically symmetric, asymptotically flat wormhole geometries. We use a purely geometric appro…
gr-qc2025
Massive particle surfaces and black hole shadows from intrinsic curvature
Boris Bermúdez-Cárdenas, Oscar Lasso Andino
In a recent article PRD 111, 064001 (2025) a new geometric a approach for studying massive particle surfaces was proposed. Using the Gaussian and geodesic curvatures of a two dimen…
gr-qc2024
Massive particle surfaces, partial umbilicity and circular orbits
Boris Bermúdez-Cárdenas, Oscar Lasso Andino
The generalization of photon spheres by considering the trajectories of massive particles leads to the definition of Massive Particle Surfaces (MPS). These surfaces are built with…