Exact Asymptotic Expansion of Singular Solutions for the (2+1)-D Protter Problem

Lubomir Dechevski, Nedyu Popivanov, Todor Popov
2012 Abstract and Applied Analysis  
We study three-dimensional boundary value problems for the nonhomogeneous wave equation, which are analogues of the Darboux problems inℝ2. In contrast to the planar Darboux problem the three-dimensional version is not well posed, since its homogeneous adjoint problem has an infinite number of classical solutions. On the other hand, it is known that for smooth right-hand side functions there is a uniquely determined generalized solution that may have a strong power-type singularity at one
more » ... y point. This singularity is isolated at the vertex of the characteristic light cone and does not propagate along the cone. The present paper describes asymptotic expansion of the generalized solutions in negative powers of the distance to this singular point. We derive necessary and sufficient conditions for existence of solutions with a fixed order of singularity and give a priori estimates for the singular solutions.
doi:10.1155/2012/278542 fatcat:teon75a6cnagdiwskq65nosojm