The orientability of spacetime

Abstract

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.

5 Pages plus 3 figures. More explanations added as requested by referees. Figures enhanced

References in corpus (3)

• Supersymmetric Rotating Black Holes and Causality Violation
• Charge and the topology of spacetime
• Spin half in classical general relativity

Cited by in corpus (8)

• Probing spatial orientability of Friedmann--Robertson--Walker spatially flat spacetime
• Inquiring electromagnetic quantum fluctuations about the orientability of space
• A topological approach for emerging D-branes and its implications for gravity
• Quantum entanglement, two-sided spacetimes and the thermodynamic arrow of time
• Pseudo-timelike loops in signature changing semi-Riemannian manifolds with a transverse radical
• Probing time orientability of spacetime
• Electrodynamics and time orientability
• Modified Newtonian dynamics as a prediction of general relativity