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          "country": "Greece", 
          "value": "Department of Nuclear and Particle Physics, Faculty of Physics, National and Kapodistrian University of Athens, Athens 15784, Greece"
        }
      ], 
      "surname": "Georgiou", 
      "email": "george.georgiou@phys.uoa.gr", 
      "full_name": "Georgiou, George", 
      "given_names": "George"
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  "titles": [
    {
      "source": "Elsevier", 
      "title": "Webs of integrable theories"
    }
  ], 
  "collections": [
    {
      "primary": "Nuclear Physics B"
    }
  ], 
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      "value": "10.1016/j.nuclphysb.2021.115340"
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      "journal_volume": "965 C", 
      "journal_title": "Nuclear Physics B", 
      "material": "article", 
      "artid": "115340", 
      "year": 2021
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  "abstracts": [
    {
      "source": "Elsevier", 
      "value": "We present an intuitive diagrammatic representation of a new class of integrable \u03c3-models. It is shown that to any given diagram corresponds an integrable theory that couples N WZW models with a certain number of each of the following four fundamental integrable models, the PCM, the YB model, both based on a group G, the isotropic \u03c3-model on the symmetric space <math><mi>G</mi><mo>/</mo><mi>H</mi></math> and the YB model on the symmetric space <math><mi>G</mi><mo>/</mo><mi>H</mi></math>. To each vertex of a diagram we assign the matrix of one of the aforementioned fundamental integrable theories. Any two vertices may be connected with a number of lines having an orientation and carrying an integer level <math><msub><mrow><mi>k</mi></mrow><mrow><mi>i</mi></mrow></msub></math>. Each of these lines is associated with an asymmetrically gauged WZW model at an arbitrary level <math><msub><mrow><mi>k</mi></mrow><mrow><mi>i</mi></mrow></msub></math>. Gauge invariance of the full action is translated to level conservation at the vertices. We also show how to immediately read from the diagrams the corresponding \u03c3-model actions. The most generic of these models depends on at least <math><msup><mrow><mi>n</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mn>1</mn></math> parameters, where n is the total number of vertices/fundamental integrable models. Finally, we discuss the case where the level conservation at the vertices is relaxed and the case where the deformation matrix is not diagonal in the space of integrable models."
    }
  ], 
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      "date": "2021-08-25", 
      "publisher": "Elsevier"
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