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Chiral symmetry breaking and monopole dynamics in noncompact QED(3) coupled to a four-Fermi interaction
DOI:
10.1103/PhysRevD.82.014503
Authors:
Wesley
Armour
(Diamond Light Source)
,
John B.
Kogut
(Department of Energy, Division of High Energy Physics)
,
Costas
Strouthos
(The Cyprus Institute)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review D
, VOL 82 (1)
State:
Published (Approved)
Published:
January 2010
Abstract: We present results from the first lattice simulations of three-dimensional noncompact quantum electrodynamics (QED(3)) with N-f four-component fermion flavors coupled to a weak Z(2) chirally invariant four-fermi interaction. Results with N-f >= 4 show that the scaling near the strong coupling chiral transition or sharp crossover is determined by the 3d Gross-Neveu ultraviolet-stable renormalization group fixed point. Small deviations of the N-f = 4 critical exponents from the respective Gross-Neveu ones, hint at evidence for nonzero fermion mass generated by the gauge fields dynamics that might have been enhanced by the four-fermi coupling. It is also shown that the scaling region is suppressed at weak four-fermi couplings and large N-f values. Measurements of (i) a monopole susceptibility which is the polarizability of the monopole configurations, and (ii) the density of isolated monopoles, imply that for N-f >= 1 and weak gauge couplings the monopoles do not affect the theory's confining properties, because they are shielded.
Subject Areas:
Physics
Technical Areas: