Physicists learn to tie a knot

Article Abstract:

It is possible to use a three-component field with a fixed magnitude and a lagrangian with two terms to construct a knot in field theory. Recent research has developed twists and linkings in string to produce two forms of stable knot, known as trefoils and unknots. It has been shown that these finite loops of string do not contract or dissipate, and are therefore lump solitons. It will be particularly interesting to look at how these knot configurations withstand perturbations.

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Self-trapping of incoherent white light

Article Abstract:

Spatial solitons have been discovered that are incoherent, yet maintain a well-defined, smooth and constant action in photorefractive materials. This observation of self-trapping of a white-light beam from an incandescent source is the first such for any temporally and spatially incoherent wave-packet. The findings open up the possibility of all-optical processors or optical soliton communications.

Observations, Wave-motion, Theory of, Wave motion, Photonics, Photorefractive materials, Wave packets

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