40 citations · 113 across the 8 of their papers we have counts for
5 papers · 1 filter
Kerr Geodesics, the Penrose Process and Jet Collimation by a Black Hole
J. Gariel, M. A. H. MacCallum, G. Marcilhacy +1
We re-examine the possibility that astrophysical jet collimation may arise from the geometry of rotating black holes and the presence of high-energy particles resulting from a Penr…
Static cylindrical symmetry and conformal flatness
L. Herrera, G. Le Denmat, G. Marcilhacy +1
We present the whole set of equations with regularity and matching conditions required for the description of physically meaningful static cylindrically symmmetric distributions of…
On the pre-nucleosynthesis cosmological period
R. Aldrovandi, J. Gariel, G. Marcilhacy
Physics, as known from our local, around--earth experience, meets some of its applicability limits at the time just preceding the period of primeval nucleosynthesis. Attention is f…
Some Properties of a New Solution of the Ernst Equation
J. Gariel, G. Marcilhacy, N. O. Santos
From a particularly simple solution of the Ernst equation, we build a solution of the vacuum stationary axisymmetric Einstein equations depending on three parameters. The parameter…
Parametrization of singularities of the Demiański-Newman spacetimes
J. Gariel, G. Marcilhacy, N. O. Santos +1
We propose a new presentation of the Demiański-Newman (DN) solution of the axisymmetric Einstein equations. We introduce new dimensionless parameters , and , but keeping…