1.Department of General Relativity and Gravitation,Kazan State University,Kazan,Russia;2.Institut für Theoretische Physik,Universit?t zu K?ln,K?ln,Germany
Abstract:
The material tensor of linear response in electrodynamics is constructed out of products of two symmetric second rank tensor
fields which in the approximation of geometrical optics and for uniaxial symmetry reduce to “optical” metrics, describing
the phenomenon of birefringence. This representation is interpreted in the context of an underlying internal geometrical structure
according to which the symmetric tensor fields are vectorial elements of an associated two-dimensional space.