It is shown that the sign of a magnetic monopole can be given an absolute significance, and not merely a relative significance. This is a consequence of the following three properties of our universe: (a) the existence of electromagnetism, (b) the existence of parity nonconserving weak interactions, and (c) the nonsymmetry with respect to the two directions of time which is manifest in the second law of thermodynamics and the expansion of the universe.
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© 1964 American Association of Physics Teachers.
1964
American Association of Physics Teachers
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