Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-12-15
JHEP 0901:052,2009
Physics
High Energy Physics
High Energy Physics - Lattice
33 pages, 10 figures, corrections in (4.7), (6.5), (6.8), additional comment on (3.16)
Scientific paper
10.1088/1126-6708/2009/01/052
Chiral perturbation theory at finite four-volume V (=L^3T) is reconsidered with a view towards finding a computational scheme that can deal with any value of M_\pi L, where M_\pi is a generic Nambu-Goldstone mass. The momentum zero modes that cause the usual p-expansion to fail in the chiral limit are treated separately, and partly integrated out to all orders. In this way the theory remains infrared finite in the perturbative expansion, and the chiral limit can be considered at finite volume. We illustrate the technique by computing the quark condensate in a finite volume, smoothly connecting standard results in the p-regime for larger masses with those of the epsilon-regime for smaller masses. From the partially quenched theory we also obtain the spectral density of the Dirac operator, a smooth function from the microscopic region to the bulk region of the p-regime.
Damgaard Poul H.
Fukaya Hidenori
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