Diquark Condensation in Two Colour Qcd
نویسندگان
چکیده
Unquenched lattice SU(2) is studied at nonzero chemical potential in the strong coupling limit. The topic of diquark condensation is addressed analyzing the probability distribution function of the diquark condensate. We present results at zero external source without using any potentially dangerous extrapolation procedure. We find strong evidences for a (high density) second order phase transition where a diquark condensate appears, and show quantitative agreement of lattice calculations with low-energy effective Lagrangian calculations.
منابع مشابه
ar X iv : h ep - p h / 04 06 15 9 v 1 1 5 Ju n 20 04 Thermodynamics of two - colour QCD and the Nambu Jona - Lasinio model ∗
We investigate two-flavour and two-colour QCD at finite temperature and chemical potential in comparison with a corresponding Nambu and JonaLasinio model. By minimizing the thermodynamic potential of the system, we confirm that a second order phase transition occurs at a value of the chemical potential equal to half the mass of the chiral Goldstone mode. For chemical potentials beyond this valu...
متن کاملThe Onset and Deconfinement Transitions in Two-colour Qcd
Abstract We study two-colour QCD with two flavours of Wilson fermion at non-zero chemical potential μ and zero temperature. We find evidence of two separate transitions: an onset transition at μ ≈ mπ/2 where quark number and energy densities increase from zero; and a deconfinement transition at higher μ. The μ-dependence of the number and energy densities and the diquark condensate indicate tha...
متن کاملPhase Transitions in QCD
At high temperatures or densities, hadronic matter shows different forms of critical behaviour: colour deconfinement, chiral symmetry restoration, and diquark condensation. I first discuss the conceptual basis of these phenomena and then consider the description of colour deconfinement in terms of symmetry breaking, through colour screening and as percolation transition.
متن کاملDiquarks and Density
We describe aspects of the role that diquark correlations play in understanding baryon structure and interactions. The significance of diquarks in that application motivates a study of the possibility that dense hadronic matter may exhibit di-quark condensation; i.e., quark-quark pairing promoted by a quark chemical potential. A Gorkov-Nambu-like gap equation is introduced for QCD and analysed ...
متن کاملInstanton-Induced Interactions in Finite Density QCD
We consider the finite density, zero-temperature behaviour of quark matter in the instanton picture. Since the instanton-induced interactions are attractive in both q̄q and qq channels, a competition ensues between phases of matter with condensation in either or both. It results in chiral symmetry restoration due to the onset of diquark condensation, a ‘colour superconductor’, at finite density.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000