Critical behavior of CP(1) at theta=pi, Haldane's conjecture, and the relevant universality class |
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Authors: | Azcoiti Vicente Di Carlo Giuseppe Galante Angelo |
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Institution: | Departamento de Física Teórica, Universidad de Zaragoza, Cl. Pedro Cerbuna 12, E-50009 Zaragoza, Spain. |
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Abstract: | Using an approach to analyze the theta dependence of systems with a theta term we recently proposed, the critical behavior of CP(10 at theta=pi is studied. We find a region outside the strong coupling regime where Haldane's conjecture is verified. The critical line, however, does not belong to the universality class of the Wess-Zumino-Novikov-Witten model at topological coupling k=1 since it shows continuously varying critical exponents. |
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