Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Testing the Orientability of Time

Version 1 : Received: 17 April 2018 / Approved: 18 April 2018 / Online: 18 April 2018 (12:38:01 CEST)

How to cite: Hadley, M. Testing the Orientability of Time. Preprints 2018, 2018040240. Hadley, M. Testing the Orientability of Time. Preprints 2018, 2018040240.


A number of experimental tests of time orientability are described as well as clear experimental signatures from non time orientability (time reversal). Some tests are well known, while others are based on more recent theoretical work. Surprisingly, the results all suggest that time is not orientable at a microscopic level; even definitive tests are positive. At a microscopic level the direction of time can reverse and a consistent forward time direction cannot be defined. That is the conclusion supported by a range of well-known experiments. The conflict between quantum theory and local realism; electrodynamics with electric charges; and spin half transformation properties of fermions; can all be interpreted as evidence of time reversal. While particle-antiparticle annihilation provides a definitive test. It offers both a new view of space-time and an novel interpretation of quantum theory with the potential to unify classical and quantum theories.


quantum theory;time orientability;time reversal; topology of spacetime


Physical Sciences, Quantum Science and Technology

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