Tetracritical behavior in strongly interacting theories

Details Tetracritical behavior in strongly interacting theories Tetracritical behavior in strongly interacting theories

2004-03-16

arxiv.org/abs/hep-ph/0403175v2

Phys.Rev. D70 (2004) 034019

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex, 5 figures. Final version to appear in PRD

Scientific paper

10.1103/PhysRevD.70.034019

We suggest a tetracritical fixed point to naturally occur in strongly interacting theories. As a fundamental example we analyze the temperature--quark chemical potential phase diagram of QCD with fermions in the adjoint representation of the gauge group (i.e. adjoint QCD). Here we show that such a non trivial multicritical point exists and is due to the interplay between the spontaneous breaking of a global U(1) symmetry and the center group symmetry associated to confinement. Our results demonstrate that taking confinement into account is essential for understanding the critical behavior as well as the full structure of the phase diagram of adjoint QCD. This is in contrast to ordinary QCD where the center group symmetry associated to confinement is explicitly broken when the quarks are part of the theory.

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