103 research outputs found
Imaginary Chemical Potential Approach for the Pseudo-Critical Line in the QCD Phase Diagram with Clover-Improved Wilson Fermions
The QCD phase diagram is studied in the lattice QCD simulation with the
imaginary chemical potential approach. We employ a clover-improved Wilson
fermion action of two-flavors and a renormalization-group improved gauge
action, and perform the simulation at an intermediate quark mass on a
lattice. The QCD phase diagram in the imaginary chemical
potential region is investigated by performing the simulation for more
than 150 points on the plane. We find that the Roberge-Weiss
phase transition at is first order and its endpoint is second
order, which are identified by the phase of the Polyakov loop. We determine the
pseudo-critical line from the susceptibility of the Polyakov loop modulus. We
find a clear deviation from a linear dependence of the pseudo-critical line on
.Comment: 10 pages, 20 figures, 3 tables. Revtex4. References are added and,
discussions are sharpene
Wilson Fermion Determinant in Lattice QCD
We present a formula for reducing the rank of Wilson fermions from to keeping the value of its determinant. We
analyse eigenvalues of a reduced matrix and coefficients in the fugacity
expansion of the fermion determinant , which play
an important role in the canonical formulation, using lattice QCD
configurations on a lattice. Numerically, varies as , and goes easily over the standard numerical range; We give a simple cure
for that. The phase of correlates with the distribution of the Polyakov
loop in the complex plain. These results lay the groundwork for future finite
density calculations in lattice QCD.Comment: 20 pages, 2 tables, 32 figure
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