Date(s) - 10/02/2015
11 h 00 min - 12 h 00 min
First-order systems of partial differential equations
appear in many areas of physics, from the Maxwell equations to the Dirac
The aim of the talk is to describe a general method for the study of
the spectral density of all such systems, connecting it to traces on the
(geometric-optical) “slowness surfaces” .
The Holder continuity of the spectral density leads to a derivation
of the limiting absorption principle and global spacetime estimates.
(based on joint work with Tomio Umeda).