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Solitary waves originating from quantum noise in stimulated Raman forward scattering are interferometrically investigated. The experimental data obtained proves the existence of solitary waves of different character. This finding is also supported by numerical calculations. The observed solitary pulses are interpreted as either a solitary wave, an antisolitary wave, or a breather.[S0031-9007(98)07954-X]

Abstnd. Perfect fluid, plane symmetric spacetimes admitting a (proper) inheriting mnformal Killing vector (ICKV) are studied. A result is proven on the general form that an ICKV can take in such a spacetime, which is then utilized to find all perfect h i d , plane symmetric ICKV spacetimes (subject to certain physical conditions). These spacetimes are discussed. I n particular, we prow that if a perfen fluid, plane symmetric spacetime, in which the perfect fluid satisfies the barotropic equation of state and in which N>O and p + p # O , admits a (proper) ICKY, then the spacetime ia necessarily a Friedmann-Robertson-Walker spacetime, or, possibly, a plane symmetric analogue of a generalized Gutman-Be'spalko-Wesson spacetime or a special static, shear-free spacetime.

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