I.M. Barbour
University of Glasgow
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Nuclear Physics | 1986
I.M. Barbour; Nasr Eddine Behilil; Elbio Dagotto; Frithjof Karsch; Adriana Moreo; Michael Stone; H. W. Wyld
We present a discussion of problems that have arisen in attempts to understand the behavior of lattice QCD at high densities. The effects observed in the lattice simulations do not seem to be consistent with what we expect from the usual ideas of chiral symmetry breaking. In particular, at zero quark mass, there does not seem to be a massive baryon at finite density.
arXiv: High Energy Physics - Lattice | 1998
I.M. Barbour; Susan E. Morrison; Elyakum G. Klepfish; John B. Kogut; Maria-Paola Lombardo
A brief summary of the formulation of QCD at finite chemical potental, μ, is presented. The failure of the quenched approximation to the problem is reviewed. Results are presented for dynamical simulations of the theory at strong and intermediate couplings. We find that the problems associated with the quenched theory persist: the onset of non-zero quark number does seem to occur at a chemical potential ≈ m x 2 . However analysis of the Lee-Yang zeros of the grand canonical partition function in the complex fugacity plane, (eμ/T), does show signals of critical behaviour in the expected region of chemical potential. Results are presented for a simulation at finite density of the Gross-Neveu model on a 163 lattice near to the chiral limit. Contrary to our simulations of QCD no pathologies were found when μ passed through the value m x 2 .
Physical Review D | 1997
I.M. Barbour; Susan E. Morrison; Elyakum G. Klepfish; John B. Kogut; Maria-Paola Lombardo
We study QCD at nonzero quark density, zero temperature, infinite coupling using the Glasgow algorithm. An improved complex zero analysis gives a critical point
Nuclear Physics | 1992
I.M. Barbour; A.J. Bell
{\ensuremath{\mu}}_{c}
Nuclear Physics | 1976
I.M. Barbour; R.L. Crawford
in agreement with that of chiral symmetry restoration computed with strong coupling expansions, and monomer-dimer simulations. We observe, however, two unphysical critical points: the onset for the number density
Nuclear Physics | 1990
I.M. Barbour; Z.A. Sabeur
{\ensuremath{\mu}}_{0}
Nuclear Physics | 1970
I.M. Barbour; R.G. Moorhouse
, and
Archive | 1987
I.M. Barbour; N.-E. Behilil; P. Gibbs; G. Schierholz; M. Teper
{\ensuremath{\mu}}_{s}
European Physical Journal C | 1981
I.M. Barbour; J. P. Gilchrist
the saturation threshold, coincident with pathological onsets observed in past quenched QCD calculations. An analysis of the probability distributions for particle number supports our physical interpretation of the critical point
Nuclear Physics | 1999
I.M. Barbour; Simon Hands; John B. Kogut; Maria-Paola Lombardo; Susan Morrison
{\ensuremath{\mu}}_{c},