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Critical points in coupled Potts models and critical phases in coupled loop models

Paul Fendley1,2 and Jesper L Jacobsen3,4

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We show how to couple two critical Q-state Potts models to yield a new self-dual critical point. We also present strong evidence of a dense critical phase near this critical point when the Potts models are defined in their completely packed loop representations. In the continuum limit, the new critical point is described by an SU(2) coset conformal field theory, while in this limit of the critical phase, the two loop models decouple. Using a combination of exact results and numerics, we also obtain the phase diagram in the presence of vacancies. We generalize these results to coupling two Potts models at different Q.


PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

11.25.Hf Conformal field theory, algebraic structures

11.30.Ly Other internal and higher symmetries

05.70.Jk Critical point phenomena

11.10.Hi Renormalization group evolution of parameters

MSC

81T17 Renormalization group methods

82B30 Statistical thermodynamics (See also 80-XX)

82B28 Renormalization group methods (See also 81T17)

81T40 Two-dimensional field theories, conformal field theories, etc.

82B27 Critical phenomena

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs

Subjects

Particle physics and field theory

Statistical physics and nonlinear systems

Dates

Issue 21 (30 May 2008)

Received 19 March 2008

Published 6 May 2008



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