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EnglishUsing an approach to analyze the $\theta$ dependence of systems with a $\theta$ term we recently proposed, the critical behavior of CP^1 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.
http://hdl.handle.net/11697/874| Titolo: | Critical behavior of CP1 at theta=pi, Haldane's conjecture, and the relevant universality class |
| Autori interni: | GALANTE, ANGELO |
| Data di pubblicazione: | 2007 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| Abstract: | Using an approach to analyze the $\theta$ dependence of systems with a $\theta$ term we recently proposed, the critical behavior of CP^1 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. |
| Handle: | http://hdl.handle.net/11697/874 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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