QCD at finite temperature and partially negative flavour numbers

Details QCD at finite temperature and partially negative flavour numbers QCD at finite temperature and partially negative flavour numbers

1996-07-26

arxiv.org/abs/hep-lat/9607067v1

Phys.Lett. B387 (1996) 829-834

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, latex, 5 figures

Scientific paper

10.1016/0370-2693(96)01115-X

We study dynamical fermion effects in lattice QCD at finite temperature. The method adopted is basically the extrapolation from negative flavour numbers already tested at zero temperature and based on the simulation of local bosonic theories, with an essential difference. With an appropriate choice of the boundary conditions on the bosonic fields, called ``bermions'', it is possible to separate the $Z_3$ breaking contribution of fermion loops to the effective action from the one conserving $Z_3$: the former is simulated exactly at a fixed positive and even flavour number, while the extrapolation from negative flavour numbers is made only on the $Z_3$ invariant part of the action. We test this approach by comparing our results on a $16^3\times 2$ lattice with those from a hopping parameter expansion and our results on a $16^3\times 4$ lattice with those of direct Monte Carlo simulations including the fermion determinant.

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