Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-09-23
PoS LAT2005 (2005) 198
Physics
High Energy Physics
High Energy Physics - Lattice
12 pages, Contribution to LATTICE 2005 (Non-zero temperature and density)
Scientific paper
We study two-color lattice QCD with massless staggered fermions in the strong coupling limit using a new and efficient cluster algorithm. We focus on the phase diagram of the model as a function of temperature $T$ and baryon chemical potential $\mu$ by working on $L_t \times L^d$ lattices in both $d=2,3$. In $d=3$ we find that at $\mu=0$ the ground state of the system breaks the global U(2) symmetry present in the model to U(1), while the finite temperature phase transition (with $L_t=4$) which restores the symmetry is a weak first order transition. In $d=2$ we find evidence for a novel phase transition similar to the Berezinky-Kosterlitz-Thouless phenomena. On the other hand the quantum (T=0) phase transition to a symmetric phase as a function of $\mu$ is second order in both $d=2,3$ and belongs to the mean field universality class.
Chandrasekharan Shailesh
Jiang Fu-Jiun
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