Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-01-26
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, Plain Tex
Scientific paper
10.1006/aphy.1996.0097
The QED(0+1) model describing a quantum mechanical particle on a circle with minimal electromagnetic interaction and with a potential -M cos(phi - theta_M), which mimics the massive Schwinger model, is discussed as a prototype of mechanisms and infrared structures of gauge quantum field theories in positive gauges. The functional integral representation displays a complex measure, with a crucial role of the boundary conditions, and the decomposition into theta sectors takes place already in finite volume. In the infinite volume limit, the standard results are reproduced for M=0 (massless fermions), but one meets substantial differences for M not = 0: for generic boundary conditions, independently of the lagrangean angle of the topological term, the infinite volume limit selects the sector with theta = theta_M, and provides a natural "dynamical" solution of the strong CP problem. In comparison with previous approaches, the strategy discussed here allows to exploit the consequences of the theta-dependence of the free energy density, with a unique minimum at theta = theta_M.
Loeffelholz J.
Morchio Giovanni
Strocchi Franco
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