Little is known about the physics frontier of strong acceleration; both
classical and quantum physics need further development in order to be able to
address this newly accessible area of physics. In this lecture we discuss what
strong acceleration means and possible experiments using electron-laser
collisions and, data available from ultra-relativistic heavy ion collisions. We
review the foundations of the current understanding of charged particle
dynamics in presence of critical forces and discuss the radiation reaction
inconsistency in electromagnetic theory and the apparent relation with quantum
physics and strong field particle production phenomena. The role of the quantum
vacuum as an inertial reference frame is emphasized, as well as the absence of
such a `Machian' reference frame in the conventional classical limit of quantum
field theory.Comment: 12 pages, 1 figure, for the proceedings of the First LeCosPA
Symposium, February 201