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Spatial Directions, Anisotropy and Special Relativity

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Abstract

The concept of an objective spatial direction in special relativity is investigated and theories assuming light-speed isotropy while accepting the existence of a privileged spatial direction are classified, including so-called very special relativity. A natural generalization of the proper time principle is introduced which makes it possible to devise non-optical experimental tests of spatial isotropy. Several common misunderstandings in the relativistic literature concerning the role of spatial isotropy are clarified.

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Mamone Capria, M. Spatial Directions, Anisotropy and Special Relativity. Found Phys 41, 1375–1397 (2011). https://doi.org/10.1007/s10701-011-9554-3

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