Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2001-04-13
Phys.Lett. B514 (2001) 77-87
Physics
High Energy Physics
High Energy Physics - Lattice
18 pages revtex, 11 figures postscript
Scientific paper
10.1016/S0370-2693(01)00586-X
SU(2) lattice gauge theory with four flavors of quarks is studied at nonzero chemical potential $\mu$ and temperature $T$ by computer simulation and Effective Lagrangian techniques. Simulations are done on $8^4$, $8^3 \times 4$ and $12^3 \times 6$ lattices and the diquark condensate, chiral order parameter, Wilson line, fermion energy and number densities are measured. Simulations at a fixed, nonzero quark mass provide evidence for a tricritical point in the $\mu$-$T$ plane associated with diquark condensation. For low $T$, increasing $\mu$ takes the system through a line of second order phase transitions to a diquark condensed phase. Increasing $T$ at high $\mu$, the system passes through a line of first order transitions from the diquark phase to the quark-gluon plasma phase. Using Effective Lagrangians we estimate the position of the tricritical point and ascribe its existence to trilinear couplings that increase with $\mu$ and $T$.
Kogut John B.
Sinclair D. K.
Toublan Dominique
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