Auflistung nach Schlagwort "Sigma Models"

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  • Beyond the standard gauging: gauge symmetries of Dirac sigma models 
    Chatzistavrakidis, Athanasios; Deser, Andreas; Jonke, Larisa; Strobl, Thomas (Heidelberg : Springer Verlag, 2016)
    In this paper we study the general conditions that have to be met for a gauged extension of a two-dimensional bosonic σ-model to exist. In an inversion of the usual approach of identifying a global symmetry and then promoting ...
  • A low-energy limit of Yang-Mills theory on de Sitter space 
    Cork, Josh; Kutluk, Emine Şeyma; Lechtenfeld, Olaf; Popov, Alexander D. (Berlin ; Heidelberg : Springer, 2021)
    We consider Yang-Mills theory with a compact structure group G on four-dimensional de Sitter space dS4. Using conformal invariance, we transform the theory from dS4 to the finite cylinder I × S3, where I = (−π/2, π/2) and ...
  • Nicolai maps with four-fermion interactions 
    Casarin, Lorenzo; Lechtenfeld, Olaf; Rupprecht, Maximilian (Berlin ; Heidelberg : Springer, 2023)
    Nicolai maps offer an alternative description of supersymmetric theories via nonlinear and nonlocal transformations characterized by the so-called ‘free-action’ and ‘determinant-matching’ conditions. The latter expresses ...
  • Sigma models for genuinely non-geometric backgrounds 
    Chatzistavrakidis, Athanasios; Jonke, Larisa; Lechtenfeld, Olaf (New York : Springer, 2015)
    The existence of genuinely non-geometric backgrounds, i.e. ones without geometric dual, is an important question in string theory. In this paper we examine this question from a sigma model perspective. First we construct ...
  • T-duality without isometry via extended gauge symmetries of 2D sigma models 
    Chatzistavrakidis, Athanasios; Deser, Andreas; Jonke, Larisa (New York : Springer, 2016)
    Target space duality is one of the most profound properties of string theory. However it customarily requires that the background fields satisfy certain invariance conditions in order to perform it consistently; for instance ...