Abstract
We briefly review some basic concepts of parallel displacement in Finsler geometry. In general relativity, the parallel translation of objects along the congruence of the fundamental observer corresponds to the evolution in time. By dropping the quadratic restriction on the measurement of an infinitesimal distance, the geometry is generalized to a Finsler structure. Apart from curvature, a new property of the manifold complicates the geometrodynamics, the color. The color brings forth an intrinsic local anisotropy, and many quantities depend on position and to a ‘supporting’ direction. We discuss this direction dependence and some physical interpretations. Also, we highlight that in Finsler geometry the parallel displacement is not necessarily always along the ‘supporting’ direction. The latter is a fundamental congruence of the manifold and induces a natural 1 + 3 decomposition. Its internal deformation is given through the evolution of the irreducible components of vorticity, shear, and expansion. Copyright © 2013 John Wiley & Sons, Ltd.
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