135 citations · 984 across the 46 of their papers we have counts for
9 papers · 1 filter
Extremal Kerr Black Hole Dark Matter from Hawking Evaporation
Quinn Taylor, Glenn D. Starkman, Michael Hinczewski +3
The Hawking process results in a monotonic decrease of the black hole mass, but a biased random walk of the black hole angular momentum. We demonstrate that this stochastic process…
Causality and the Arrow of Time in the Branch-Cut Cosmology
Benno Bodmann, César A. Zen Vasconcellos, José de Freitas Pacheco +2
We basis our initial analysis of the arrow of time on a relationship between the time evolution operator of quantum system and the time-independent density operator which describes…
Branch-Cut Cosmology and the Bekenstein Criterion
José A. de Freitas Pacheco, César A. Zen Vasconcellos, Peter O. Hess +2
In this contribution we address the implications of the Bekenstein Criterion in the branch-cut cosmology. The impossibility of packaging energy and entropy according to the Bekenst…
Quasi-normal modes of black holes and naked singularities: revisiting the WKB method
Edison C. Santos, Júlio C. Fabris, José A. de Freitas Pacheco
In this paper we revisit the analysis of the ringdown frequencies in the form of quasi-normal modes for Schwarzschild,Schwarzschild de-Sitter and Reissner-Nordström space-times. We…
Gravitational waves from binary axionic black holes
J. A. de Freitas Pacheco, S. Carneiro, J. C. Fabris
In a recent paper we have shown that a minimally coupled, self-interacting scalar field of mass can form black holes of mass (in Planck units). If dark matter…
Visser's Massive Gravity Bimetric Theory Revisited
Alain de Roany, Bertrand Chauvineau, J. A. de Freitas Pacheco
A massive gravity theory was proposed by Visser in the late nineties. This theory, based on a backgroung metric and on an usual dynamical metric has the advantage…
Relativistic Accretion into a Reissner-Nordström Black Hole Revisited
J. A. de Freitas Pacheco
The accretion of relativistic and non-relativistic fluids into a Reissner-Nordström black hole is revisited. The position of the critical point, the flow velocity at this point and…
The Cosmological Constant and the Gravitational Light Bending
Tolu Biressa, J. A. de Freitas Pacheco
The solution of the null non-radial geodesic in a Schwarzschild-de Sitter background is revisited. The gravitational bending of a light ray is affected by the cosmological constant…
Continuous matter creation and the acceleration of the universe: the growth of density fluctuations
Alain de Roany, J. A. de Freitas Pacheco
Cosmologies including continuous matter creation are able to reproduce the main properties of the standard CDM model, in particular in cases where the particle and entropy produ…