Physical consequences of the QED theta angle

Stephen D.H. Hsu

Physical consequences of the QED theta angle

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arxiv 1012.2906 v1 pith:K4DGIWGI submitted 2010-12-14 hep-th hep-phquant-ph

Stephen D.H. Hsu This is my paper · ORCID

classification hep-thhep-phquant-ph

keywords angleeffectsphasesphysicalquantumthetaaharonov-bohmalthough

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We describe a simple gedanken experiment which illustrates the physical effects of the QED theta angle, a fundamental parameter of Nature that has yet to be measured. The effects are manifest in quantum phases analogous to those in the Aharonov-Bohm effect, although they are not intrinsically topological. We also derive the quantum phases using a functional Schrodinger approach, and generalize the results to non-Abelian gauge theories.

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The true gauge group of the G2HDM can differ by a discrete center quotient, and this choice changes the allowed line operators, theta-angle periodicities, and minimal electric and magnetic charges after symmetry breaking.

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