Self-screening Hawking Atmosphere in the Presence of a Bulk Viscosity
نویسنده
چکیده
The recent theory of ’t Hooft [Nucl. Phys. Suppl. 68, 174 (1998)] models the black hole as a system endowed with an envelope of matter that obeys an equation of state in the form p = (γ − 1)ρ, and acts as a source in Einstein’s equations. The present paper generalizes the ’t Hooft theory so as to take into account a bulk viscosity ζ in the fluid. It is shown that even a slight positive value of ζ will suffice to yield complete agreement with the Hawking formula for the entropy of the black hole, if the value of the constant γ takes a value that is slightly less than 4/3. The value γ = 4/3 corresponds to a radiation fluid.
منابع مشابه
Bulk Viscous Bianchi Type VI0 Cosmological Model in the Self-creation Theory of Gravitation and in the General Theory of Relativity
In the second self-creation theory of gravitation and in the general theory of relativity, Bianchi type VI0 cosmological model in the presence of viscous fluid is studied. An exact solution of the field equations is given by considering the cosmological model yields a constant decelerations parameter q=constant and the coefficients of the metric are taken as A(t)=[c1t+c<su...
متن کاملGeneral relativistic hydrodynamic flows around a static compact object in final stages of accretion flow
Dynamics of stationary axisymmetric configuration of the viscous accreting fluids surrounding a non-rotating compact object in final stages of accretion flow is presented here. For the special case of thin disk approximation, the relativistic fluid equations ignoring self-gravity of the disk are derived in Schwarzschild geometry. For two different state equations, two sets of self-consistent an...
متن کاملStephen Hawking's Community-Bound Voice A Functional Investigation of Self-Mentions in Stephen Hawking's Scientific Prose
Thanks to the development of the concept of metadiscourse, it is now widely acknowledged that academic/scientific writing is not only concerned with communicating purely propositional meanings: what is communicated through academic/scientific communication is seen to be intertwined with the negotiation of social and interpersonal meanings. While a large number of so called metadiscoursal resour...
متن کاملEffects of shear and bulk viscosity on head-on collision of localized waves in high density compact stars
Head on collision of localized waves in cold and dense hadronic matter with and without shear and bulk viscosities is investigated. Non-relativistic dynamics of propagating waves is studied using the hydrodynamics description of the system and suitable equation of state. It will be shown that the localized waves are described by solutions of the Burgers equation. Simulations show that the propa...
متن کاملCalculation of the relativistic bulk tensor and shear tensor of relativistic accretion flows in the Kerr metric.
In this paper, we calculate the relativistic bulk tensor and shear tensor of the relativistic accretion ows in the Kerr metric, overall and without any approximation. We obtain the relations of all components of the relativistic bulk and shear tensor in terms of components of four-velocity and its derivatives, Christoffel symbols and metric components in the BLF. Then, these components are deri...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1999