Magnetized Dusty Black Holes and Wormholes
نویسندگان
چکیده
We consider the generalized Tolman solution of general relativity, describing evolution a spherical dust cloud in presence an external electric or magnetic field. The contains three arbitrary functions f(R), F(R) and τ0(R), where R is radial coordinate comoving reference frame. splits into branches corresponding to hyperbolic (f>0), parabolic (f=0) elliptic (f<0) types motion. In such models, we study possible existence wormhole throats defined as spheres minimum radius at fixed time instant, prove branch under certain conditions imposed on functions. It further shown that normal throat timelike vector (except for instant maximum expansion, when this null), hence located T-region space-time. Thus, if placed between two empty (Reissner–Nordström Schwarzschild) space-time regions, whole configuration black hole rather than wormhole. However, clouds with can be inscribed closed isotropic cosmological models filled form wormholes which exist finite period experience expansion contraction together cosmology. Explicit examples numerical estimates are presented. traversability wormhole-like evolving layers established by null geodesics.
منابع مشابه
Black Holes, Wormholes, and Gravitational Collapse
We study a possibility of the dynamical formation of traversable wormholes from gravitationally collapsing exotic matter clouds. For generic metric ansatz of exterior spacetimes, a crucial constraint that black holes and wormholes should satisfy is obtained through the junction conditions on the edge. As a result, it is shown that the wormhole geometry cannot be formed by following the usual Op...
متن کاملBlack holes and traversible wormholes: a synthesis
A unified framework for black holes and traversible wormholes is described, where both are locally defined by outer trapping horizons, two-way traversible for wormholes and one-way traversible for black or white holes. In a two-dimensional dilaton gravity model, examples are given of: construction of wormholes from black holes; operation of wormholes for transport, including back-reaction; main...
متن کاملMagnetized Tori of Black Holes
The dynamics of accretion disks around galactic and extragalactic black holes may be influenced by their magnetic field. In this paper we generalize the fully relativistic theory of stationary axisymmetric tori in Kerr metric of Abramowicz et al.(1978) by including strong toroidal magnetic field. This development is particularly important for the general relativistic computational magnetohydrod...
متن کاملNoncommutative geometry inspired wormholes and dirty black holes
We provide new exact solutions of the Einstein equations which generalize the noncommutative geometry inspired Schwarzschild metric, previously obtained by the authors. We consider here more general equations of state and find new geometries describing both a regular “dirty black hole” and a “wormhole”. We discuss strong and weak energy condition violation and variuos aspects of the regular dir...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Universe
سال: 2021
ISSN: ['2218-1997']
DOI: https://doi.org/10.3390/universe7110419