Quenched QCD at finite density
Abstract
Simulations of quenched QCD at relatively small but nonzero chemical potential mu on 32 times 16(sup 3) lattices indicate that the nucleon screening mass decreases linearly as mu increases predicting a critical chemical potential of onethird the nucleon mass, M(sub N)/3, by extrapolation. The meson spectrum does not change as mu increases over the same range, from zero to m(sub pi)/2. Past studies of quenched lattice QCD have suggested that there is phase transition at mu=m(sub pi)/2. The authors provide alternative explanations for these results, and find a number of technical reasons why standard lattice simulation techniques suffer from greatly enhanced fluctuations and finite size effects for mu ranging from m(sub pi)/2 to m(sub N)/3. They find evidence for such problems in their simulations, and suggest that they can be surmounted by improved measurement techniques.
 Publication:

Unknown
 Pub Date:
 January 1994
 Bibcode:
 1994qcfd.rept.....K
 Keywords:

 Field Theory (Physics);
 Nucleons;
 Quantum Chromodynamics;
 Quarks;
 Quenching (Atomic Physics);
 Chirality;
 Dirac Equation;
 Gluons;
 Mass Spectra;
 Mathematical Models;
 Mesons;
 Monte Carlo Method;
 Particle Spin;
 SolidState Physics