Evolution of a Kerr-Newman black hole in a dark energy universe

Instituto de Matemáticas y Física Fundamental Consejo Superior de Investigaciones Científicas Serrano 123 Madrid 28006 Spain
Gravitation and Cosmology (Impact Factor: 0.46). 06/2008; 14(3):213-225. DOI: 10.1134/S020228930803002X
Source: arXiv

ABSTRACT This paper deals with a study of the accretion of dark energy with the equation of state p = ωρ onto Kerr-Newman black holes. We have obtained that, when ω > −1, the mass and specific angular momentum increase, and that whereas the specific angular momentum increases up to a given
plateau, the mass grows up unboundedly. In the regime where the dominant energy condition is violated, our model predicts
steadily decreasing mass and angular momentum of a black hole as phantom energy is being accreted. Masses and angular momenta
of all black holes tend to zero when one approaches the Big Rip. The results that cosmic censorship is violated and that the
black hole size increases beyond the universe size itself are discussed in terms of considering the models used as approximations
to more general descriptions where the metric is time-dependent.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We have investigated the accretion of phantom energy onto a 5-dimensional extreme Einstein-Maxwell-Gauss-Bonnet (EMGB) black hole. It is shown that the evolution of the EMGB black hole mass due to phantom energy accretion depends only on the pressure and density of the phantom energy and not on the black hole mass. Further we study the generalized second law of thermodynamics (GSL) at the event horizon and obtain a lower bound on the pressure of the phantom energy.
    International Journal of Theoretical Physics 01/2011; 50(2). · 1.09 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this work, we have studied accretion of the dark energies NVMCG and GCCG onto the Schwarzschild and Kerr-Newman Black holes. We find the expression of the critical four velocity component which gradually decreases for the fluid flow towards the Schwarzschild as well as Kerr-Newman Black hole. We also find the expression for change of masses of the black hole in both cases. For the Kerr-Newman black hole which is rotating and charged we calculate the specific angular momentum and total angular momentum. We showed that in both cases due to accretion of the dark energy mass of the black hole increases and angular momentum increases in case of Kerr-Newman black hole.
    European Physical Journal C 12/2011; 72(3). · 5.25 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Motivated by some earlier works \cite{pavon,sadjadi} dealing with the study of generalized second law (GSL) of thermodynamics for a system comprising of a Schwarzschild black accreting a test non-self-gravitating fluid namely phantom energy in FRW universe, we extend them when the entropy of horizons of black hole and the cosmological undergo quantum corrections. Two types of such corrections are relevant here including logarithmic and power-law, while both are motivated from different theoretical backgrounds. We obtain general mathematical conditions for the validity of GSL in each case. Further we find that GSL restricts the mass of black hole for accretion of phantom energy. As such we obtain upper bounds on the mass of black hole above which the black hole cannot accrete the phantom fluid, otherwise the GSL is violated.
    International Journal of Modern Physics D 03/2012; 21(7). · 1.03 Impact Factor

Full-text (2 Sources)

1 Download
Available from