How to use drainhole in a sentence? Find typical usage patterns (collocations)/phrases/context for "drainhole" and check conjugation/comparative form for "drainhole". Mastering all the usages of "drainhole" from sentence examples published by news publications.
The possibility of traversable wormholes in general relativity was first demonstrated in a 1973 paper by Homer Ellis and independently in a 1973 paper by K. A. Bronnikov. Ellis analyzed the topology and the geodesics of the Ellis drainhole, showing it to be geodesically complete, horizonless, singularity-free, and fully traversable in both directions. The drainhole is a solution manifold of Einstein's field equations for a vacuum spacetime, modified by inclusion of a scalar field minimally coupled to the Ricci tensor with antiorthodox polarity (negative instead of positive). (Ellis specifically rejected referring to the scalar field as 'exotic' because of the antiorthodox coupling, finding arguments for doing so unpersuasive.) The solution depends on two parameters: , which fixes the strength of its gravitational field, and , which determines the curvature of its spatial cross sections.
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Well known vortices have acquired names and are regularly depicted in the popular media: hurricanes, tornadoes, waterspouts, aircraft trailing vortices (e.g., wingtip vortices), drainhole vortices (including the bathtub vortex), smoke rings, underwater bubble air rings, cavitation vortices behind ship propellers, and so on. In the technical literature a number of vortices that arise under special conditions also have names: the Kármán vortex street wake behind a bluff body, Taylor vortices between rotating cylinders, Görtler vortices in flow along a curved wall, etc.
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Theories of wormhole metrics describe the spacetime geometry of a wormhole and serve as theoretical models for time travel. An example of a (traversable) wormhole metric is the following: first presented by Ellis (see Ellis wormhole) as a special case of the Ellis drainhole. One type of non-traversable wormhole metric is the Schwarzschild solution (see the first diagram): \+ r^2(d \theta^2 + \sin^2 \theta \, d\varphi^2).}} The original Einstein–Rosen bridge was described in an article published in July 1935.
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