# Mathematical Sciences Research Institute

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# Seminar

Incoming and Disappearing Solutions for Maxwell's equations September 09, 2010
Parent Program: -- MSRI: Simons Auditorium
Speaker(s) Vesselin Petkov
Description No Description
Video
We prove that in contrast to the free wave equation in $\R3$ there are no incoming solutions of Maxwell's equations in the form of spherical or modulated spherical waves. We construct solutions which are corrected by lower order incoming waves. With their aid, we construct dissipative boundary conditions and solutions to Maxwell's equations in the exterior of a sphere which decay exponentially as $t \to + \infty$. They are asymptotically disappearing. Disappearing solutions which are identically zero for $t \geq T > 0$ are constructed which satisfy maximal dissipative boundary conditions which depend on time $t.$ Both types of solutions are invisible in scattering theory and the existence of such solutions perturbs the inverse scattering.