Quantum coherence down the wormhole

Details Quantum coherence down the wormhole Quantum coherence down the wormhole

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..195..337h&link_type=abstract

Physics Letters B, Volume 195, Issue 3, p. 337-343.

Physics

176

Scientific paper

It is shown that pure quantum states will appear to decay into mixed states in any theory of quantum gravity that allows the topology of spacetime to be non simply connected. The reason is that the final state may contain little closed universes. There is no way one can detect the existence of these closed universes, or measure their quantum state. This means that the part of the final state that is in asymptotically flat spacetime, appears to be in a mixed state. The loss of quantum coherence in particle collisions is estimated. It comes from a wormhole connecting two asymptotically euclidean regions. The effect would be significant for scalar particles. It would make any scalar field that was not coupled to a Yang-Mills field constant throughout spacetime. It could have an important effect on Higgs particles but the effect would be small for particles of higher spin.
I am grateful to Raymond Laflamme for checking my calculations and to Sidney Coleman for discussions. Further details will be published elsewhere.

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