Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2002-02-08
Class.Quant.Grav. 19 (2002) 4565-4572
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 Pages plus 3 figures. More explanations added as requested by referees. Figures enhanced
Scientific paper
10.1088/0264-9381/19/17/308
Contrary to established beliefs, spacetime may not be time-orientable. By
considering an experimental test of time orientability it is shown that a
failure of time-orientability of a spacetime region would be indistinguishable
from a particle antiparticle annihilation event.
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