Contact Geometry of Hyperbolic Equations of Generic Type

Details Contact Geometry of Hyperbolic Equations of Generic Type Contact Geometry of Hyperbolic Equations of Generic Type

2008-04-09

arxiv.org/abs/0804.1559v2

SIGMA 4 (2008), 058, 1-52

Mathematics

Differential Geometry

This is a contribution to the Special Issue "Elie Cartan and Differential Geometry", published in SIGMA (Symmetry, Integrabili

Scientific paper

10.3842/SIGMA.2008.058

We study the contact geometry of scalar second order hyperbolic equations in the plane of generic type. Following a derivation of parametrized contact-invariants to distinguish Monge-Ampere (class 6-6), Goursat (class 6-7) and generic (class 7-7) hyperbolic equations, we use Cartan's equivalence method to study the generic case. An intriguing feature of this class of equations is that every generic hyperbolic equation admits at most a nine-dimensional contact symmetry algebra. The nine-dimensional bound is sharp: normal forms for the contact-equivalence classes of these maximally symmetric generic hyperbolic equations are derived and explicit symmetry algebras are presented. Moreover, these maximally symmetric equations are Darboux integrable. An enumeration of several submaximally symmetric (eight and seven-dimensional) generic hyperbolic structures is also given.

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