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--- models:standard_model [2019/02/03 08:46]
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 <cite>http://math.ucr.edu/home/baez/week253.html</cite>
 </blockquote>
+<blockquote>r. Correlation functions of local operators in
+R1,3 depend only on the Lie algebra of the gauge group and are unaffected by global
+issues such as the choice of Γ. This means that no current experiment can distinguish
+between the four possibilities. Nonetheless, the physics in flat space can depend in
+subtle ways on Γ (and in more dramatic ways when spacetime has interesting topology).
+The purpose of this paper is to describe the crudest differences between the theories:
+the spectrum of line operators and the periodicities of theta angles.<cite>https://arxiv.org/pdf/1705.01853.pdf</cite></blockquote>
 **A great discussion of these things with awesome illustrations can be found in section 1.4 and at page 26 in Some Elementary Gauge Theory Concepts by Hong-Mo Chan, Sheung Tsun Tsou:**