Zobrazeno 1 - 10
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pro vyhledávání: '"Khakshournia, S."'
Autor:
Khakshournia, S., Mansouri, R.
Publikováno v:
Gravitation and Cosmology, 2023, Vol. 29, No. 3, pp. 220-226
The effective Einstein equations on a 3-brane embedded in a 5-dimensional Riemann-Cartan bulk spacetime are revisited. Addressing the shortcomings in the hitherto published junction conditions on the brane in the presence of torsion, we have elaborat
Externí odkaz:
http://arxiv.org/abs/2402.07649
Autor:
Khakshournia, S., Mansouri, R.
The Israel junction conditions of a thin shell in the context of Einstein-Cartan gravity are revisited. It is shown that with a choice of the torsion discontinuity taken to be orthogonal to the hypersurface and consistent with the antisymmetric prope
Externí odkaz:
http://arxiv.org/abs/2006.04044
Autor:
Khakshournia, S., Mansouri, R.
Publikováno v:
Class. Quant. Grav. 36 (2019) 227001
The stress-energy tensor of a matter shell whose history coincides with a null hypersurface in the Einstein-Cartan gravity is revisited. It is demonstrated that with a proper choice for the torsion discontinuity taken to be orthogonal to the null hyp
Externí odkaz:
http://arxiv.org/abs/1912.12650
Publikováno v:
In Progress in Nuclear Energy January 2021 131
Autor:
Khakshournia, S.
Publikováno v:
Grav.Cosmol.16:178-180,2010
Pathria has shown that for the certain values of the cosmological constant, a pressureless closed Friedmann-Robertson-Walker universe can be the interior of a Schwarzschild black hole. We examine the Pathria's model from the point of view of the matc
Externí odkaz:
http://arxiv.org/abs/1412.0105
Autor:
Khakshournia, S.
We study the gravitational collapse of a rotating cylindrical null shell with flat interior and the metric of a spinning cosmic string as the exterior. We see that there is a critical radius, where the energy density of the shell vanishes and beyond
Externí odkaz:
http://arxiv.org/abs/1108.0564
Autor:
Khakshournia, S.
Publikováno v:
Gen.Rel.Grav.42:381-385,2010
In this work the matching of a LTB interior solution representing dust matter to the Vaidya exterior solution describing null fluid through a null hypersurface is studied. Different cases in which one is able to smoothly match these two solutions to
Externí odkaz:
http://arxiv.org/abs/0907.0824
Akademický článek
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Autor:
Khakshournia, S., Mansouri, R.
Publikováno v:
Grav.Cosmol.14:295-300,2008
Matching of a LTB metric representing dust matter to a background FRW universe across a null hypersurface is studied. In general, an unrestricted matching is possible only if the background FRW is flat or open. There is in general no gravitational im
Externí odkaz:
http://arxiv.org/abs/gr-qc/0702130
Publikováno v:
Int.J.Mod.Phys.D16:629-640,2007
We consider a planar gravitating thick domain wall of the $\lambda \phi^4$ theory as a spacetime with finite thickness glued to two vacuum spacetimes on each side of it. Darmois junction conditions written on the boundaries of the thick wall with the
Externí odkaz:
http://arxiv.org/abs/gr-qc/0609132