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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"
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      ], 
      "surname": "Sfetsos", 
      "email": "ksfetsos@phys.uoa.gr", 
      "full_name": "Sfetsos, Konstantinos", 
      "given_names": "Konstantinos"
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    {
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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"
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      ], 
      "surname": "Siampos", 
      "email": "konstantinos.siampos@phys.uoa.gr", 
      "full_name": "Siampos, Konstantinos", 
      "given_names": "Konstantinos"
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  "titles": [
    {
      "source": "Elsevier", 
      "title": "-Deformations in the upper-half plane"
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  "collections": [
    {
      "primary": "Nuclear Physics B"
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      "year": 2021
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  "abstracts": [
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      "source": "Elsevier", 
      "value": "We formulate \u03bb-deformed \u03c3-models as QFTs in the upper-half plane. For different boundary conditions we compute correlation functions of currents and primary operators, exactly in the deformation parameter \u03bb and for large values of the level k of the underlying WZW model. To perform our computations we use either conformal perturbation theory in association with Cardy's doubling trick, as well as meromorphicity arguments and a non-perturbative symmetry in the parameter space <math><mo>(</mo><mi>\u03bb</mi><mo>,</mo><mi>k</mi><mo>)</mo></math>, or standard QFT techniques based on the free field expansion of the \u03c3-model action, with the free fields obeying appropriate boundary conditions. Both methods have their own advantages yielding consistent and rich, compared to those in the absence of a boundary, complementary results. We pay particular attention, albeit not exclusively, to integrability preserving boundary conditions."
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