Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Karkowski, Janusz"'
Autor:
Karkowski, Janusz, Kulczycki, Wojciech, Mach, Patryk, Malec, Edward, Odrzywolek, Andrzej, Pirog, Michal
Publikováno v:
Phys. Rev. D 97, 104017 (2018)
We integrate numerically axially symmetric stationary Einstein equations describing self-gravitating disks around spinless black holes. The numerical scheme is based on a method developed by Shibata, but contains important new ingredients. We derive
Externí odkaz:
http://arxiv.org/abs/1802.02848
Autor:
Karkowski, Janusz, Kulczycki, Wojciech, Mach, Patryk, Malec, Edward, Odrzywolek, Andrzej, Pirog, Michal
Publikováno v:
Phys. Rev. D 97, 104034 (2018)
We obtain from the first principles a general-relativistic Keplerian rotation law for self-gravitating disks around spinning black holes. This is an extension of a former rotation law that was designed mainly for toroids around spin-less black holes.
Externí odkaz:
http://arxiv.org/abs/1712.05673
Publikováno v:
Phys. Rev. D 95, 064037 (2017)
We analytically construct an infinite number of trapped toroids in spherically symmetric Cauchy hypersurfaces of the Einstein equations. We focus on initial data which represent "constant density stars" momentarily at rest. There exists an infinite n
Externí odkaz:
http://arxiv.org/abs/1701.02861
Publikováno v:
Phys. Rev. D 94, 124041 (2016)
We consider stationary, axially symmetric toroids rotating around spinless black holes, assuming the general-relativistic Keplerian rotation law, in the first post-Newtonian approximation. Numerical investigation shows that the angular momentum accum
Externí odkaz:
http://arxiv.org/abs/1609.06586
Publikováno v:
Phys. Rev. D 88, 084056 (2013)
We investigate spherical, isothermal and polytropic steady accretion models in the presence of the cosmological constant. Exact solutions are found for three classes of isothermal fluids, assuming the test gas approximation. The cosmological constant
Externí odkaz:
http://arxiv.org/abs/1309.1252
Autor:
Karkowski, Janusz, Malec, Edward
Publikováno v:
Phys. Rev. D15, vol. 87, 04400(2013)
In this paper we investigate a steady accretion within the Einstein-Straus vacuole, in the presence of the cosmological constant. The dark energy damps the mass accretion rate and --- above certain limit --- completely stops the steady accretion onto
Externí odkaz:
http://arxiv.org/abs/1211.3618
Quasi-stationary flows of gas accreting onto a compact center are analyzed in the framework of general-relativistic radiation hydrodynamics, under assumptions of spherical symmetry and thin gas approximation. Numerical investigation shows that lumino
Externí odkaz:
http://arxiv.org/abs/0806.2240
We analyze stationary accretion of selfgravitating gas onto a compact center within general-relativistic radiation hydrodynamics. Spherical symmetry and thin gas approximation are assumed. Numerical investigation shows that transonic flows exist for
Externí odkaz:
http://arxiv.org/abs/0804.3898
The spherically symmetric steady accretion of polytropic perfect fluids onto a black hole is the simplest flow model that can demonstrate the effects of backreaction. Backreaction keeps intact most of the characteristics of the sonic point. For any s
Externí odkaz:
http://arxiv.org/abs/gr-qc/0612184
We investigate newtonian description of accreting compact bodies with hard surfaces, including luminosity and selfgravitation of polytropic perfect fluids. This nonlinear integro-differential problem reduces, under appropriate boundary conditions, to
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611393