Lattice Study of Dense Matter with Two Colors and Four Flavors

Abstract

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.

arXiv commentHorizontal axes of several figures rescaled. Version accepted for publication

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• Equation of State of hot and dense QCD: Resummed perturbation theory confronts lattice data
• Dark Nuclei II: Nuclear Spectroscopy in Two-Colour QCD
• Universal Aspects of QCD-like Theories
• Phase transitions and gluodynamics in 2-colour matter at high density
• Peaks of sound velocity in two color dense QCD: quark saturation effects and semishort range correlations
• The phase diagram of a gauge theory with fermionic baryons
• Fluctuations in cool quark matter and the phase diagram of Quantum Chromodynamics
• Effect of Light Fermions on the Confinement Transition in QCD-like Theories
• Continuum Goldstone spectrum of two-color QCD at finite density with staggered quarks
• Dense two-color QCD from Dyson-Schwinger equations
• Effects of Dense Quark Matter on Gluon Propagators in Lattice QC${}_2$D
• Thermal quarks and gluon propagators in two-color dense QCD
• Hadron masses and baryonic scales in $G_2$-QCD at finite density
• Color screening in cold quark matter
• Non-relativistic spectrum of two-color QCD at non-zero baryon density
• Stressed Cooper pairing in QCD at high isospin density: effective Lagrangian and random matrix theory
• Fluctuation-induced higher-derivative couplings and infrared dynamics of the Quark-Meson-Diquark Model
• When cold, dense quarks in 1+1 and 3+1 dimensions are not a Fermi liquid
• Finite-Density Massless Two-Color QCD at Isospin Roberge-Weiss Point and 't Hooft Anomaly
• Classification of sign-problem-free relativistic fermions on the basis of the Majorana positivity
• Thermal quarks and Polyakov loops in two-color dense QCD