LogoLogo
  • Bio
  • Fyzika
  • V médiích
  • Fotografie
  • Výstavy
  • Kontakt

    Pseudo-Newtonian and general relativistic barotropic tori in Schwarzschild-de Sitter spacetimes

    Zdeněk Stuchlík · Listopad 01, 2009 · Fyzika · 0 comments
    0

    Publication date: Nov 2009

    Abstract:
    Pseudo-Newtonian gravitational potential introduced in spherically
    symmetric black-hole spacetimes with a repulsive cosmological constant
    is tested for equilibrium toroidal configurations of barotropic perfect
    fluid orbiting the black holes. Shapes and potential depths are
    determined for the marginally stable barotropic tori with uniform
    distribution of specific angular momentum, using both the
    pseudo-Newtonian and fully relativistic approach. For the adiabatic
    (isoentropic) perfect fluid, temperature profiles, mass-density and
    pressure profiles and total masses of pseudo-Newtonian and relativistic
    tori are compared providing important information on the relevance of
    the test-disc approximation in both the approaches. It is shown that the
    pseudo-Newtonian approach can be precise enough and useful for the
    modelling of accretion discs in the Schwarzschild-de Sitter spacetimes
    with the cosmological parameter y = ΛM2/3 lsim
    10-6. For astrophysically relevant black holes with y <
    10-25, this statement is tested and shown to be precise in
    few per cent for both accretion and excretion tori and for the
    marginally bound, i.e. maximally extended, tori allowing simultaneous
    inflow to the black hole and outflow to the outer space.

    Authors:
    Stuchlík, Zdeněk; Slaný, Petr; Kovář, Jiří;

    http://adsabs.harvard.edu/abs/2009CQGra..26u5013S

      Facebook   Pinterest   Twitter   Google+

    Leave a Comment! Zrušit odpověď na komentář

    You must be logged in to post a comment.
    Archivy
    Copyright © 2016 Zdeněk Stuchlík