The Phase Diagram of the $U(2)\times U(2)$ Sigma Model

Details The Phase Diagram of the $U(2)\times U(2)$ Sigma Model The Phase Diagram of the $U(2)\times U(2)$ Sigma Model

1997-09-18

arxiv.org/abs/hep-lat/9709060v1

Nucl.Phys.Proc.Suppl. 63 (1998) 572-574

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages (Latex), 2 eps figures, uses espcrc2.sty, epsf, talk given at LATTICE97

Scientific paper

10.1016/S0920-5632(97)00837-2

We study the phase diagram of the $U(2) \times U(2)$ scalar model in $d=4$
dimensions. We find that the phase transition is of first order in most of the
parameter space. The theory can still be relevant to continuum physics (as an
effective theory) provided the transition is sufficiently weakly first order.
This places restrictions on the allowed coupling constants.

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