Thursday, March 1, 2012

1202.6578 (Marco Mamone-Capria)

Simultaneity as an Invariant Equivalence relation    [PDF]

Marco Mamone-Capria
This paper deals with the concept of simultaneity in classical and relativistic physics as construed in terms of group-invariant equivalence relations. A full examination of Newton, Galilei and Poincar\'e invariant equivalence relations in $\R^4$ is presented, which provides alternative proofs, additions and occasionally corrections of results in the literature, including Malament's theorem and some of its variants. It is argued that the interpretation of simultaneity as an invariant equivalence relation, although mathematically interesting, does not cut in the debate concerning the conventionality of simultaneity in special relativity.
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