Chiral Susceptibilities in noncompact QED: a new determination of the $γ$ exponent and the critical couplings

Details Chiral Susceptibilities in noncompact QED: a new determination of the $γ$ exponent and the critical couplings Chiral Susceptibilities in noncompact QED: a new determination of the $γ$ exponent and the critical couplings

1996-01-30

arxiv.org/abs/hep-lat/9601026v1

Phys.Lett. B353 (1995) 279-283

Physics

High Energy Physics

High Energy Physics - Lattice

11 pages, figures on request

Scientific paper

10.1016/0370-2693(95)00580-E

We report the results of a measurement of susceptibilities in noncompact $QED_4$ in $8^4, 10^4$ and $12^4$ lattices. Due to the potentialities of the $MFA$ approach, we have done simulations in the chiral limit which are therefore free from arbitrary mass extrapolations. Our results in the Coulomb phase show unambiguously that the susceptibility critical exponent $\gamma=1$ independently of the flavour symmetry group. The critical couplings extracted from these calculations are in perfect agreement with previous determinations based on the fermion effective action and plaquette energy, and outside the predictions of a logarithmically improved scalar mean field theory by eight standard deviations.

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