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Title: Linearly degenerate PDEs and quadratic line complexes
Authors: Ferapontov, E.V.
Moss, Jonathan
Keywords: Multi-dimensional second order PDE
Quadratic line complex
Linear degeneracy
Conformal structure
Integrability
Issue Date: 2015
Publisher: © International Press
Citation: FERAPONTOV, E.V. and MOSS, J., 2015. Linearly degenerate PDEs and quadratic line complexes. Communications in Analysis and Geometry, 23(1), pp. 91–127.
Abstract: A quadratic line complex is a three-parameter family of lines in projective space P3 specified by a single quadratic relation in the Plücker coordinates. Fixing a point p in P3 and taking all lines of the complex passing through p we obtain a quadratic cone with vertex at p. This family of cones supplies P3 with a conformal structure, which can be represented in the form fij(p)dpidpj in a system of affine coordinates p = (p1; p2; p3). With this conformal structure we associate a three-dimensional second-order quasilinear wave equation, X i;j fij(ux1 ; ux2 ; ux3 )uxixj = 0; whose coefficients can be obtained from fij(p) by setting p1 = ux1 ; p2 = ux2 ; p3 = ux3 . We show that any PDE arising in this way is linearly degenerate, furthermore, any linearly degenerate PDE can be obtained by this construction. This provides a classi cation of linearly degenerate wave equations into eleven types, labelled by Segre symbols of the associated quadratic complexes. We classify Segre types for which the structure fij(p)dpidpj is conformally at, as well as Segre types for which the corresponding PDE is integrable.
Description: This paper was accepted for publication in the Communications in Analysis and Geometry. The definitive published version can be found at:http://dx.doi.org/10.4310/CAG.2015.v23.n1.a3
Version: Accepted for publication
DOI: 10.4310/CAG.2015.v23.n1.a3
URI: https://dspace.lboro.ac.uk/2134/20232
Publisher Link: http://dx.doi.org/10.4310/CAG.2015.v23.n1.a3
ISSN: 1944-9992
Appears in Collections:Published Articles (Maths)

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