10,148 research outputs found
General Non-extremal Rotating Charged Godel Black Holes in Minimal Five-Dimensional Gauged Supergravity
We present the general exact solutions for non-extremal rotating charged
black holes in the Godel universe of five-dimensional minimal supergravity
theory. They are uniquely characterized by four non-trivial parameters, namely
the mass , the charge , the Kerr equal rotation parameter , and the
Godel parameter . We calculate the conserved energy, angular momenta and
charge for the solutions and show that they completely satisfy the first law of
black hole thermodynamics. We also study the symmetry and separability of the
Hamilton-Jacobi and the massive Klein-Gordon equations in these
Einstein-Maxwell-Chern-Simons-Godel black hole backgrounds.Comment: 4 pages, revtex4.cls. 4th revised versio
Elastic Spin Hall effect in Mechanical Graphene
We show that spin-orbit interaction and elastic spin-Hall effect can exist in
a classical mechanical system consisting of a two-dimensional honeycomb lattice
of masses and springs. The band structure shows the presence of splitting at K
point induced by the difference of longitudinal and transverse elastic
constant, and this splitting can be regarded as an effective Dresselhaus-type
spin-orbit coupling. Interestingly, as an initial displacement away from the
equilibrium is applied, the time evolution simulation shows that waves of
different spin polarization propagates along different directions at the Gamma
and K point, which is characteristic of spin-Hall effect. Several cases for
spin-Hall effect are also discussed.Comment: 15 pages, 5 figures, and 3395 word
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