Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-01-25
Eur.Phys.J.A47:60,2011
Physics
High Energy Physics
High Energy Physics - Lattice
Horizontal axes of several figures rescaled. Version accepted for publication
Scientific paper
10.1140/epja/i2011-11060-1
We present results from a simulation of SU(2) lattice gauge theory with N_f=4 flavors of Wilson fermion and non-zero quark chemical potential mu, using the same 12^3x24 lattice, bare gauge coupling, and pion mass in cut-off units as a previous study with N_f=2. The string tension for N_f=4 is found to be considerably smaller implying smoother gauge field configurations. Thermodynamic observables and order parameters for superfluidity and color deconfinement are studied, and comparisons drawn between the two theories. Results for quark density and pressure as functions of mu are qualitatively similar for N_f=2 and N_f=4; in both cases there is evidence for a phase in which baryonic matter is simultaneously degenerate and confined. Results for the stress-energy tensor, however, suggest that while N_f=2 has a regime where dilute matter is non-relativistic and weakly-interacting, N_f=4 matter is relativistic and strongly-interacting for all values of mu above onset.
Hands Simon
Kenny Philip
Kim Seyong
Skullerud Jon-Ivar
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