Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Sushkov, S V."'
Autor:
Kashargin, P. E., Sushkov, S. V.
Publikováno v:
Grav.Cosmol.17:119-125,2011
We construct a model of a rotating wormhole made by cutting and pasting two Kerr spacetimes. As a result, we obtain a rotating thin-shell wormhole with exotic matter at the throat. Two candidates for the exotic matter are considered: (i) a perfect fl
Externí odkaz:
http://arxiv.org/abs/1101.5281
Publikováno v:
Phys.Rev.D81:084034,2010
We calculate the vacuum average value of the field square and the stress-energy tensor of a massive scalar field, with non-minimal coupling $\xi$ to the curvature in the short-throat flat-space wormhole background. The obtained results are not suitab
Externí odkaz:
http://arxiv.org/abs/1003.0344
Publikováno v:
Grav.Cosmol.15:241-246,2009
We consider static, spherically symmetric solutions of general relativity with a nonlinear sigma model (NSM) as a source, i.e., a set of scalar fields $\Phi = (\Phi^1,...,\Phi^n)$ (so-called chiral fields) parametrizing a target space with a metric $
Externí odkaz:
http://arxiv.org/abs/0905.3804
Autor:
Kozyrev, S. M., Sushkov, S. V.
New classes composite vacuum wormhole solutions of Jordan-Brans-Dicke gravitation is presented and analysed. It is shown that such solution holds for both, a bridge between separated Schwarzschild and Brans Universes and for a bridge connecting two S
Externí odkaz:
http://arxiv.org/abs/0812.5010
Autor:
Kashargin, P. E., Sushkov, S. V.
Publikováno v:
Phys.Rev.D78:064071,2008
We discuss rotating wormholes in general relativity with a scalar field with negative kinetic energy. To solve the problem, we use the assumption about slow rotation. The role of a small dimensionless parameter plays the ratio of the linear velocity
Externí odkaz:
http://arxiv.org/abs/0809.1923
Autor:
Kashargin, P. E., Sushkov, S. V.
Publikováno v:
Grav.Cosmol.14:80-85,2008
We discuss a solution describing a rotating wormhole in the theory of gravity with a scalar field with negative kinetic energy. To solve the problem we use the assumption about slow rotation. The role of a small dimensionless parameter plays the rati
Externí odkaz:
http://arxiv.org/abs/0710.5656
Autor:
Sushkov, S. V.
Publikováno v:
Phys.Rev. D71 (2005) 043520
We extend the notion of phantom energy--which is generally accepted for homogeneously distributed matter with $w<-1$ in the universe--on inhomogeneous spherically symmetric spacetime configurations. A spherically symmetric distribution of phantom ene
Externí odkaz:
http://arxiv.org/abs/gr-qc/0502084
Autor:
Sushkov, S. V., Kim, S. -W.
Publikováno v:
Gen.Rel.Grav.36:1671-1678,2004
We consider a scalar field with a negative kinetic term minimally coupled to gravity. We obtain an exact non-static spherically symmetric solution which describes a wormhole in cosmological setting. The wormhole is shown to connect two homogeneous sp
Externí odkaz:
http://arxiv.org/abs/gr-qc/0404037
Publikováno v:
Phys.Rev. D67 (2003) 104003
We study nonconformal quantum scalar fields and averages of their local observables (such as ^{ren} and T_{ab}^{ren}) in a spacetime of a 2-dimensional black hole. In order to get an analytical approximation for these expressions the WKB appro
Externí odkaz:
http://arxiv.org/abs/hep-th/0212115
Autor:
Sushkov, S. V., Kim, S. -W.
Publikováno v:
Class.Quant.Grav. 19 (2002) 4909-4922
We study the problem of existence of static spherically symmetric wormholes supported by the kink-like configuration of a scalar field. With this aim we consider a self-consistent, real, nonlinear, nonminimally coupled scalar field $\phi$ in general
Externí odkaz:
http://arxiv.org/abs/gr-qc/0208069