130 research outputs found
Exact Solutions of G-Invariant Chiral Equations
We give a methodology for solving the chiral equations where
belongs to some Lie group . The solutions are writing in terms of
Harmonic maps. The method could be used even for some infinite Lie groups.
(Preprint CIEA-gr-94/06)Comment: 8 TeX pages. Seminar presented at the First Mexican-Russian Meeting
on Mathematical Physics, Mexico city, 199
Rotating Scalar Field Wormhole
We derive an exact solution to the Einstein's equations with a stress-energy
tensor corresponding to an opposite-sign scalar field, and show that such a
solution describes the internal region of a rotating wormhole. We also derive
an static wormhole asymptotically flat solution and match them on both regions,
thus obtaining an analytic solution for the complete space-time. We explore
some of the features of these solutions.Comment: Sign of the exponential in equation (10) has been changed. Some typos
correcte
Space-Time Curvature Signatures in Bose-Einstein Condensates
We derive a generalized Gross-Pitaevski (GP) equation immersed on a
electromagnetic and a weak gravitational field starting from the covariant
Complex Klein-Gordon field in a curved space-time. We compare it with the GP
equation where the gravitational field is added by hand as an external
potential. We show that there is a small difference of order between
them that could be measured in the future using Bose-Einstein Condensates
(BEC). This represents the next order correction to the Newtonian gravity in a
curved space-time.Comment: 4 pages, no figure
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