Valleys in String Foam Suppress Quantum Coherence

Details Valleys in String Foam Suppress Quantum Coherence Valleys in String Foam Suppress Quantum Coherence

1993-05-24

arxiv.org/abs/hep-th/9305116v2

Mod.Phys.Lett.A10:425-440,1995

Physics

High Energy Physics

High Energy Physics - Theory

CERN-TH.6896/93, 12 pages, 1 figure, (final version to be published in Mod. Physics Letters)

Scientific paper

10.1142/S0217732395000466

We exhibit string contributions to the $\nd{S}$ matrix relating in- and out- state density matrices that do not factorize as a product of $S$ and $S^\dagger$ matrices. They are associated with valley trajectories between topological defects on the string world sheet, that appear as quantum fluctuations in the space-time foam. Through their ultraviolet cut-off dependences these valleys cause non-Hamiltonian time evolution and suppress off-diagonal entries in the density matrix at large times.

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