The orientability of spacetime

TL;DR

This paper challenges the common assumption that spacetime is time-orientable, proposing an experimental test to detect non-orientability which could mimic particle-antiparticle annihilation events.

Contribution

It introduces a novel experimental approach to test the orientability of spacetime, questioning a fundamental assumption in physics.

Findings

Failure of time-orientability mimics particle-antiparticle annihilation

Proposes an experimental test for spacetime orientability

Challenges established beliefs about spacetime structure

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.