278 citations · 682 across the 10 of their papers we have counts for
10 papers
Interior of a Schwarzschild black hole revisited
Rosa Doran, Francisco S. N. Lobo, Paulo Crawford
The Schwarzschild solution has played a fundamental conceptual role in general relativity, and beyond, for instance, regarding event horizons, spacetime singularities and aspects o…
Stability analysis of dynamic thin shells
Francisco S. N. Lobo, Paulo Crawford
We analyze the stability of generic spherically symmetric thin shells to linearized perturbations around static solutions. We include the momentum flux term in the conservation ide…
Linearized stability analysis of thin-shell wormholes with a cosmological constant
Francisco S. N. Lobo, Paulo Crawford
Spherically symmetric thin-shell wormholes in the presence of a cosmological constant are constructed applying the cut-and-paste technique implemented by Visser. Using the Darmois-…
Time, Closed Timelike Curves and Causality
Francisco Lobo, Paulo Crawford
General Relativity is contaminated with non-trivial geometries which generate closed timelike curves. These apparently violate causality, producing time-travel paradoxes. We shall…
Weak energy condition violation and superluminal travel
Francisco Lobo, Paulo Crawford
Recent solutions to the Einstein Field Equations involving negative energy densities, i.e., matter violating the weak-energy-condition, have been obtained, namely traversable wormh…
Generalized observers and velocity measurements in General Relativity
P. Crawford, I. Tereno
To resolve some unphysical interpretations related to velocity measurements by static observers, we discuss the use of generalized observer sets, give a prescription for defining t…