Download Backlund & Darboux Transformations by C. Rogers, W. K. Schief PDF

By C. Rogers, W. K. Schief

This e-book describes the extraordinary connections that exist among the classical differential geometry of surfaces and glossy soliton idea. The authors additionally discover the wide physique of literature from the 19th and early 20th centuries by means of such eminent geometers as Bianchi, Darboux, Bäcklund, and Eisenhart on ameliorations of privileged sessions of surfaces which go away key geometric homes unchanged. well-liked among those are Bäcklund-Darboux differences with their impressive linked nonlinear superposition ideas and value in soliton thought.

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3, a distance property is recorded for B¨acklund transformations at the surface level. 26) which, on appropriate parametrisation, produces the complex equation Euv + 1 ␳v 1 ␳u 2Eu Ev E¯ Eu + Ev = . 28) where ␳ z z¯ = 0, describes surfaces of Bianchi type in three-dimensional Minkowski space. 6). With this important geometric interpretation of the Ernst equation in mind, we proceed to give an account of its B¨acklund and Darboux transformations. These can be used to construct important solutions of Einstein’s vacuum equations.

This is a consequence of an elegant nonlinear superposition principle derived from the auto-B¨acklund transformation B␤ and originally set down by Bianchi [35] in 1892. 25) and that ␻1 and ␻2 are the B¨acklund transforms of ␻ via B␤1 and B␤2 , that is, ␻1 = B␤1 (␻), ␻2 = B␤2 (␻). Let ␻12 = B␤2 (␻1 ) and ␻21 = B␤1 (␻2 ). 1. It is natural to enquire if there are any circumstances under which the commutative condition ␻12 = ␻21 applies. 1. A Bianchi diagram. u-parts of the B¨acklund transformations associated with the Bianchi diagram.

It will be seen that this B¨acklund transformation, in fact, corresponds to a conjugation of invariant transformations due to Bianchi and Lie. The Lie symmetry serves to intrude a key B¨acklund parameter into the Bianchi transformation which enables its iteration and the generation thereby of what are, in physical terms, multi-soliton solutions. Therein, the B¨acklund parameters have an important physical interpretation. 2 The Classical B¨acklund Transformation for the Sine-Gordon Equation Underlying the original B¨acklund transformation for the sine-Gordon equation is a simple geometric construction for pseudospherical surfaces.

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