Physics – Mathematical Physics
Scientific paper
2003-05-20
Theor.Math.Phys. 137 (2003) 1743-1752; Teor.Mat.Fiz. 137 (2003) 457-468
Physics
Mathematical Physics
to appear in the special issue of Theor. Math. Phys. for the Proceedings of NEEDS2002; Keywords: Heavenly equation, group foli
Scientific paper
10.1023/B:TAMP.0000007922.86197.
We present the method of group foliation for constructing non-invariant solutions of partial differential equations on an important example of the Boyer-Finley equation from the theory of gravitational instantons. We show that the commutativity constraint for a pair of invariant differential operators leads to a set of its non-invariant solutions. In the second part of the paper we demonstrate how the hodograph transformation of the ultra-hyperbolic version of Boyer-Finley equation in an obvious way leads to its non-invariant solution obtained recently by Manas and Alonso. Due to extra symmetries, this solution is conditionally invariant, unlike non-invariant solutions obtained previously. We make the hodograph transformation of the group foliation structure and derive three invariant relations valid for the hodograph solution, additional to resolving equations, in an attempt to obtain the orbit of this solution.
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