Browsing by Subject "Differential and Algebraic Geometry"

Browsing by Subject "Differential and Algebraic Geometry"

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  • All complete intersection Calabi-Yau four-folds 
    Gray, James; Haupt, Alexander S.; Lukas, Andre (New York, NY : Springer International Publishing, 2013)
    We present an exhaustive, constructive, classification of the Calabi-Yau four-folds which can be described as complete intersections in products of projective spaces. A comprehensive list of 921,497 configuration matrices ...
  • 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 ...
  • Finite-action solutions of Yang-Mills equations on de Sitter dS4 and anti-de Sitter AdS4 spaces 
    Ivanova, Tatiana A.; Lechtenfeld, Olaf; Popov, Alexander D. (Heidelberg : Springer Verlag, 2017)
    We consider pure SU(2) Yang-Mills theory on four-dimensional de Sitter dS4 and anti-de Sitter AdS4 spaces and construct various solutions to the Yang-Mills equations. On de Sitter space we reduce the Yang-Mills equations ...
  • Generalised geometry for string corrections 
    Coimbra, André; Minasian, Ruben; Triendl, Hagen; Waldram, Daniel (Berlin : Springer Verlag, 2014)
    We present a general formalism for incorporating the string corrections in generalised geometry, which necessitates the extension of the generalised tangent bundle. Not only are such extensions obstructed, string symmetries ...
  • Generalised structures for N=1 AdS backgrounds 
    Coimbra, André; Strickland-Constable, Charles (New York, NY : Springer International Publishing, 2016)
    We expand upon a claim made in a recent paper [arXiv: 1411.5721] that generic minimally supersymmetric AdS backgrounds of warped flux compactifications of Type II and M theory can be understood as satisfying a straightforward ...
  • Heterotic compactifications on nearly Kahler manifolds 
    Lechtenfeld, Olaf; Noelle, Christoph; Popov, Alexander D. (New York, NY : Springer International Publishing, 2010)
    We consider compactifications of heterotic supergravity on anti-de Sitter space, with a six-dimensional nearly Kahler manifold as the internal space. Completing the model proposed by Frey and Lippert [10] with the particular ...
  • Instantons and Killing spinors 
    Harland, Derek; Nölle, Christoph (Heidelberg : Springer Verlag, 2012)
    We investigate instantons on manifolds with Killing spinors and their cones. Examples of manifolds with Killing spinors include nearly Kähler 6-manifolds, nearly parallel G2-manifolds in dimension 7, Sasaki-Einstein ...
  • Instantons on Calabi-Yau and hyper-Kähler cones 
    Geipel, Jakob C.; Sperling, Marcus (Heidelberg : Springer Verlag, 2017)
    The instanton equations on vector bundles over Calabi-Yau and hyper-Kähler cones can be reduced to matrix equations resembling Nahm’s equations. We complement the discussion of Hermitian Yang-Mills (HYM) equations on ...
  • 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 ...
  • Yang-Mills instantons and dyons on homogeneous G(2)-manifolds 
    Bauer, Irina; Ivanova, Tatiana A.; Lechtenfeld, Olaf; Lubbe, Felix (New York, NY : Springer International Publishing, 2010)
    We consider LieG-valued Yang-Mills fields on the space RxG/H, where G/H is a compact nearly Kahler six-dimensional homogeneous space, and the manifold RxG/H carries a G(2)-structure. After imposing a general G-invariance ...
  • Yang-Mills instantons on cones and sine-cones over nearly Kahler manifolds 
    Gemmer, Karl-Philip; Lechtenfeld, Olaf; Noelle, Christoph; Popov, Alexander D. (New York, NY : Springer International Publishing, 2011)
    We present a unified eight-dimensional approach to instanton equations on several seven-dimensional manifolds associated to a six-dimensional homogeneous nearly Kahler manifold. The cone over the sine-cone on a nearly ...