M. Pospelov, S. Pustelny, M. P. Ledbetter, D. F. Jackson Kimball, W. Gawlik, D. Budker
Stable domain walls of light (pseudo)scalar fields permeating the entire Universe and persisting to the present epoch is a generic consequence of many extensions to the Standard Model. Currently the combination of gravitational and cosmological constraints provides the best limits on such a possibility. We show that if domain walls are generated by an axion-like field with a coupling to the spins of standard-model particles, and the galactic environment contains a network of such walls, terrestrial experiments aimed at detection of wall-crossing events are realistic. In particular, a geographically separated but time-synchronized network of sensitive atomic magnetometers can detect a wall crossing and probe a range of model parameters currently unconstrained by astrophysical observations and gravitational experiments.
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http://arxiv.org/abs/1205.6260
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