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An upper limit to the electric dipole moment of the neutron from lattice QCD

B. Alles, M. D'Elia, A. Di Giacomo

hep-latarXiv:hep-lat/0510067

Abstract

A linear increase with the volume of the topological susceptibility can signal spontaneous breaking of parity and time inversion, due to a nonzero vacuum expectation value of the topological charge. Such a breaking would produce a nonzero electric dipole moment of the neutron, dn. An upper limit to dn is derived from numerical simulations at increasing volumes.

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