404 research outputs found
Experimental test for 5th dimension in Kaluza-Klein gravity
Several electric/magnetic charged solutions (dyons) to 5D Kaluza-Klein
gravity on the principal bundle are reviewed. Here we examine the possibility
that these solutions can act as quantum virtual wormholes in spacetime foam
models. By applying a sufficently large, external electric and/or magnetic
field it may be possible to ``inflate'' these solutions from a quantum to a
classical state. This effect could lead to a possible experimental signal for
higher dimensions in multidimensional gravity.Comment: 4 pages, 4 figures, Talk given at the Third Meeting on Constrained
Dynamics and Quantum Gravity, Villasimius (Sardinia), September 13-17, 199
Strings and Branes under Microscope
It is shown that in the standard vacuum 5D Kaluza-Klein gravity there is
wormhole-like solutions which look like strings attached to two D-branes. The
asymptotical behaviour of the corresponding metric is investigated.Comment: comparison with known solutions is adde
Strings in the Einstein's paradigm of matter
Spherically symmetric solutions with a flux of electric and magnetic fields
in Kaluza-Klein gravity are considered. It is shown that under the condition
(electric charge ) (magnetic charge ) () these solutions
are like a flux tube stretched between two Universes. The longitudinal size of
this tube depends on the value of . The cross section of the
tube can be chosen . In this case this flux tube looks like a
1-dimensional object (thread) stretched between two Universes. The propagation
of gravitational waves on the thread is considered. The corresponding equations
are very close to the classical string equations. This result allows us to say
that the thread between two Universes is similar to the string attached to two
branes.Comment: changes in the tex
Spherically Symmetric solutions in Multidimensional Gravity with the SU(2) Gauge Group as the Extra Dimensions
The multidimensional gravity on the principal bundle with the SU(2) gauge
group is considered. The numerical investigation of the spherically symmetric
metrics with the center of symmetry is made. The solution of the gravitational
equations depends on the boundary conditions of the ``SU(2) gauge potential''
(off-diagonal metric components) at the symmetry center and on the type of
symmetry (symmetrical or antisymmetrical) of these potentials. In the chosen
range of the boundary conditions it is shown that there are two types of
solutions: wormhole-like and flux tube. The physical application of such kind
of solutions as quantum handles in a spacetime foam is discussed.Comment: misprints are correcte
Ellipsoidal, Cylindrical, Bipolar and Toroidal Wormholes in 5D Gravity
In this paper we construct and analyze new classes of wormhole and flux
tube-like solutions for the 5D vacuum Einstein equations. These 5D solutions
possess generic local anisotropy which gives rise to a gravitational running or
scaling of the Kaluza-Klein ``electric'' and ``magnetic'' charges of these
solutions. It is also shown that it is possible to self-consistently construct
these anisotropic solutions with various rotational 3D hypersurface geometries
(i.e. ellipsoidal, cylindrical, bipolar and toroidal). The local anisotropy of
these solutions is handled using the technique of anholonomic frames with their
associated nonlinear connection structures [vst]. Through the use of the
anholonomic frames the metrics are diagonalized, in contrast to holonomic
coordinate frames where the metrics would have off-diagonal components. In the
local isotropic limit these solutions are shown to be equivalent to spherically
symmetric 5D wormhole and flux tube solutions.Comment: 27 pages ReVTeX, added references and discussion. To be published in
J. Math. Phy
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