Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-06-30
Physics
High Energy Physics
High Energy Physics - Lattice
5 pages, 2 figures, revised journal version
Scientific paper
Yang-Mills theories with a gauge group SU(N_c\=3)and quark matter in the fundamental representation share many properties with the theory of strong interactions, QCD with N_c=3. We show that, for N_c even and in the confinement phase, the gluonic average of the quark determinant is independent of the boundary conditions, periodic or anti-periodic ones. We then argue that a Fermi sphere of quarks can only exist under extreme conditions when the centre symmetry is spontaneously broken and colour is liberated. Our findings are supported by lattice gauge simulations for N_c=2...5 and are illustrated by means of a simple quark model.
Langfeld Kurt
Wellegehausen Bjoern H.
Wipf Andreas
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