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EnglishUsing new as well as known results on dimerized quantum spin chains with frustration, we are able to infer some properties on the low-energy spectrum of the O(3) Nonlinear Sigma Model with a topological θ-term. In particular, for sufficiently strong coupling, we find a range of values of θ where a singlet bound state is stable under the triplet continuum. On the basis of these results, we propose a new renormalization group flow diagram for the Nonlinear Sigma Model with a θ-term.
| Titolo: | Particle content of the nonlinear sigma model with a θ-term: a lattice model investigation |
| Autore/i: | L. Campos Venuti; DEGLI ESPOSTI BOSCHI, CRISTIAN; ERCOLESSI, ELISA; ORTOLANI, FABIO; MORANDI, GIUSEPPE; PASINI, STEFANO; RONCAGLIA, MARCO |
| Autore/i Unibo: | |
| Anno: | 2005 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/1742-5468/2005/02/L02004 |
| Abstract: | Using new as well as known results on dimerized quantum spin chains with frustration, we are able to infer some properties on the low-energy spectrum of the O(3) Nonlinear Sigma Model with a topological θ-term. In particular, for sufficiently strong coupling, we find a range of values of θ where a singlet bound state is stable under the triplet continuum. On the basis of these results, we propose a new renormalization group flow diagram for the Nonlinear Sigma Model with a θ-term. |
| Data prodotto definitivo in UGOV: | 2005-10-09 19:30:18 |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/11585/12273
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