1,887 research outputs found
On black holes in multidimensional theory with Ricci-flat internal spaces
A generalization of the Tangherlini solution for the case of n internal
Ricci-flat spaces is obtained. It is shown that in the (2+d)-dimensional
section a horizon exists only in the trivial case when the internal-space
factors are constant. The p-adic analog of the solution is also considered.Comment: 6 pages, Late
Scalar field in a minimally coupled brane world: no-hair and other no-go theorems
In the brane-world framework, we consider static, spherically symmetric
configurations of a scalar field with the Lagrangian (\d\phi)^2/2 - V(\phi),
confined on the brane. We use the 4D Einstein equations on the brane obtained
by Shiromizu et al., containing the usual stress tensor T\mN, the tensor
\Pi\mN, quadratic in T\mN, and E\mN describing interaction with the bulk.
For models under study, the tensor \Pi\mN has zero divergence, so we can
consider a "minimally coupled" brane with E\mN = 0, whose 4D gravity is
decoupled from the bulk geometry. Assuming E\mN =0, we try to extend to brane
worlds some theorems valid for scalar fields in general relativity (GR). Thus,
the list of possible global causal structures in all models under consideration
is shown to be the same as is known for vacuum with a term in GR:
Minkowski, Schwarzschild, (A)dS and Schwarzschild-(A)dS. A no-hair theorem,
saying that, given a potential , asymptotically flat black holes
cannot have nontrivial external scalar fields, is proved under certain
restrictions. Some objects, forbidden in GR, are allowed on the brane, e.g,
traversable wormholes supported by a scalar field, but only at the expense of
enormous matter densities in the strong field region.Comment: 8 pages, Latex2e. Numerical estimates and a few references adde
Numerical simulation of 2D electrodynamic problems with unstructured triangular meshes
We present a generalization of standard Yee approach for Cauchy problem in
electrodynamic simulations on unstructured triangulated mesh. In the paper the
whole flow from mesh creation to actual simulation is presented. The proposed
computation flow is parallel ready and can be implemented for distributed
systems (computation servers, GPU-s, etc.). We studied the influence of
non-regular triangulation on stability and dispersion properties of numerical
solution
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Spin Transport and Exchange Coupling in Ballistic Magnetic Multilayers
In this work we study a set of related problems in the theory of ballistic spin transport. We draw special attention to the phenomenon of exchange coupling, which is interesting both from the theoretical point of view, and the possible applications in spintronics. For the calculations we employ the Landauer transfer matrix formalism, testing its assumptions, extending it to new models and establishing links with other branches of physics
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