Towards the phase diagram of dense two-color matter

Abstract

We study two-color QCD with two flavors of Wilson fermion as a function of quark chemical potential mu and temperature T. We find evidence of a superfluid phase at intermediate mu and low T where the quark number density and diquark condensate are both very well described by a Fermi sphere of nearly-free quarks disrupted by a BCS condensate. Our results suggest that the quark contribution to the energy density is negative (and balanced by a positive gauge contribution), although this result is highly sensitive to details of the energy renormalisation. We also find evidence that the chiral condensate in this region vanishes in the massless limit. This region gives way to a region of deconfined quark matter at higher T and mu, with the deconfinement temperature, determined from the renormalised Polyakov loop, decreasing only very slowly with increasing chemical potential. The quark number susceptibility chi_q does not exhibit any qualitative change at the deconfinement transition. We argue that this is because chi_q is not an appropriate measure of deconfinement for 2-color QCD at high density.

19 pages, 20 eps figures. Published version: reorganised results section including expanded discussion of diquark source extrapolation; modified discussion of chiral symmetry; some minor adjustments

References in corpus (9)

• The QCD transition temperature: results with physical masses in the continuum limit
• Equation of state and QCD transition at finite temperature
• High-precision scale setting in lattice QCD
• Deconfinement in dense 2-color QCD
• QCD thermodynamics with dynamical overlap fermions
• Hadron Spectrum in a Two-Colour Baryon-Rich Medium
• Dynamical QCD simulations on anisotropic lattices
• The phase diagram of a gauge theory with fermionic baryons
• Lattice Study of Dense Matter with Two Colors and Four Flavors

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