Confined but chirally symmetric hadrons at large density and the Casher's argument

Details Confined but chirally symmetric hadrons at large density and the Casher's argument Confined but chirally symmetric hadrons at large density and the Casher's argument

2009-07-09

arxiv.org/abs/0907.1473v2

Phys.Rev.D80:037701,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pp., PRD, in print; some minor modifications in the text

Scientific paper

10.1103/PhysRevD.80.037701

Casher's argument, which is believed to be quite general, states that in the confining regime chiral symmetry is necessarily broken. In the large-N_c limit and at moderate and low temperatures QCD is confining up to arbitrary large densities, and there should appear a quarkyonic matter. It has been demonstrated, within a manifestly confining and chirally symmetric model, which is a 3+1 dimensional generalization of the 't Hooft model, that, at zero temperature and at a density exceeding a critical one, the chiral symmetry is restored while quarks remain confined in color-singlet hadrons. This is in conflict with the Casher's argument. Here we explain the reason why the Casher's argument fails and clarify the physical mechanism lying behind such confined but chirally symmetric hadrons.

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