Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-01-18
Beyond general relativity : proceedings of the 2004 Spanish Relativity Meeting (ERE2004), Natxo Alonso-Alberca, [et al.], ed.,
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
7 pages, 3 figures. Contribution to the conference "Spanish Relativity Meeting, Beyond General Relativity", Miraflores de la S
Scientific paper
As shown by the development of Special Relativity the simultaneity concept should be related to that of reference frame. Poincare' proposed to define the simultaneity of two events by means of light signals following what is nowadays known as the Einstein simultaneity convention. The need of a simultaneity definition is present also in general relativity and in curved spacetimes in order to provide the observers with a coordinate time. It is recognized that the old Einstein simultaneity convention is nothing but a connection on a suitable trivial bundle that defines the reference frame. Unfortunately, it has a non vanishing holonomy in curved and even in flat spacetimes a fact that makes it almost useless. We point out the advantage of local simultaneity conventions showing that they are represented by local simultaneity connections. Among them there is one, uniquely determined by the reference frame, which is particularly well-behaved globally.
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