742 citations · 9.6k across the 169 of their papers we have counts for
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Binary Collisions and the Slingshot Effect
Amaro J. Rica da Silva, Jose P. S. Lemos
We derive the equations for the gravity assist manoeuvre in the general 2D case without the constraints of circular planetary orbits or widely different masses as assumed by Brouck…
Electrically charged compact stars and formation of charged black holes
Subharthi Ray, Aquino L. Espindola, Manuel Malheiro +2
We study the effect of electric charge in compact stars assuming that the charge distribution is proportional to the mass density. The pressure and the density of the matter inside…
Linear perturbations in a universe with a cosmological constant
Antonio Vale, Jose' P. S. Lemos
There are now evidences that the cosmological constant has a non-zero positive value. Alternative scenarios to a pure cosmological constant model are provided by quintessence,…
Equiangular Spiral Modes of Power Law Disks
D. Lynden-Bell, J. P. S. Lemos
The stability of self-similar power-law disks to non-axially symmetrical disturbances of zero frequency (omega = 0) is discussed. It is established that marginally unstable modes e…
Black Holes: from Galactic Nuclei to Elementary Particles
Jose' P. S. Lemos
We present a broad review on black holes. We analyse some of the fundamental concepts in black hole theory, the observational and theoretical status of stellar and galactic black h…