Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-10-05
Phys.Rev.D80:084010,2009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
7 pages, 2 figures, 1 table, accepted in Physical Review D
Scientific paper
10.1103/PhysRevD.80.084010
Numerical solutions for the integral curves of the velocity field (streamlines), the density contours, and the accretion rate of a steady-state flow of an ideal fluid with $p=K n^\gamma$ equation of state are presented. The streamlines and velocity fields associated with a black hole and a rigid sphere in a Reissner-Nordstr\"om-(anti) de Sitter spacetimes are studied in some detail. For each case the fluid density is studied using contour lines. For $\gamma \neq 2$, we found that the studied properties of the fluid are more sensitive to variations of the electric charge and the cosmological constant. Also, the accretion rate was found to increase or decrease when the cosmological constant increases or decreases respectively.
Colvero Gustavo C.
Ujevic Maximiliano
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