Diquark Condensation at Nonzero Chemical Potential and Temperature

SU(2) lattice gauge theory with four flavors of quarks is studied at nonzero chemical potential $μ$ 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 $μ$-$T$ plane associated with diquark condensation. For low $T$, increasing $μ$ takes the system through a line of second order phase transitions to a diquark condensed phase. Increasing $T$ at high $μ$, 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 $μ$ and $T$.

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