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Facts and Prospects of Gauge Theories - Proceedings of the XVII. Internationale Universitatswochen fur Kernphysik 1978 der Karl-Franzens-Universitat Graz at Schladming (Steiermark, Austria), 21st February - 3rd March 1978 (Paperback, Softcover reprint of the original 1st ed. 1978)
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Facts and Prospects of Gauge Theories - Proceedings of the XVII. Internationale Universitatswochen fur Kernphysik 1978 der Karl-Franzens-Universitat Graz at Schladming (Steiermark, Austria), 21st February - 3rd March 1978 (Paperback, Softcover reprint of the original 1st ed. 1978)
Series: Few-Body Systems, 19/1978
Expected to ship within 10 - 15 working days
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These lectures concern the properties of topological charge in
gauge theories and the physical effects which have been attributed
to its existence. No introduction to this subject would be adequate
without a discussion of the original work of Belavin, Polyakov,
Schwarz, and Tyupkin [1], of the beautiful calculation by 't Hooft
[2,3], and of the occurrence of 8-vacua [4-6]. Other important
topics include recent progress on solutions of the Yang-Mills
equation of motion [7,8], and the problem of parity and
time-reversal invariance in strong interactions [9] (axions
[10,11], etc. ). In a few places, I have strayed from the
conventional line and in one important case, disagreed with it. The
im- portant remark concerns the connection between chirality and
topological charge first pointed out by 't Hooft [2]: in the
literature, the rule is repeatedly quoted with the wrong sign! If
QS is the generator for Abelian chiral transformations of massless
quarks with N flavours, the correct form of the rule is ssQs = - 2N
{topological charge} (1. 1) where ssQS means the out eigenvalue of
QS minus the in eigenvalue. The sign can be checked by consulting
the standard WKB calculation [2,3], rotating to Minkowski space,
and observing that the sum of right-handed chiralities of operators
in a Green's function equals -ssQS. The wrong sign is an automatie
consequence of a standard but incorrect derivation in which the
axial charge is misidentified.
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