18 The Doppler Effect
213
Nevertheless, this is the only method that accommodates our physical problem. The
physical symmetry, here the relativistic symmetry of the Doppler effect that we previously only knew for light can only be described using this method. The relevance
of such a description using internal measuring instruments will become fully clear
when we turn to the examination of dynamic questions, as we will do in Chaps. 22 and
23. In these chapters, we will explicitly show that the properties of inertia and energy
of dislocation configurations, which only have physical meaning when brought into
relation with a lattice are determined by the critical velocity c o .
213
Nevertheless, this is the only method that accommodates our physical problem. The
physical symmetry, here the relativistic symmetry of the Doppler effect that we previously only knew for light can only be described using this method. The relevance
of such a description using internal measuring instruments will become fully clear
when we turn to the examination of dynamic questions, as we will do in Chaps. 22 and
23. In these chapters, we will explicitly show that the properties of inertia and energy
of dislocation configurations, which only have physical meaning when brought into
relation with a lattice are determined by the critical velocity c o .