The boundary value problem for Dirac-harmonic maps
Qun Chen, Jürgen Jost, Guofang Wang, and Miaomiao Zhu
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Submission date: 19. Oct. 2011
published in: Journal of the European Mathematical Society, 15 (2013) 3, p. 997-1031
DOI number (of the published article): 10.4171/JEMS/384
MSC-Numbers: 58E20, 53C43, 53C27
Keywords and phrases: Dirac-harmonic map, regularity, boundary value
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Dirac-harmonic maps are a mathematical version (with commuting variables only) of the solutions of the field equations of the non-linear supersymmetric sigma model of quantum field theory. We explain this structure, including the appropriate boundary conditions, in a geometric framework. The main results of our paper are concerned with the analytic regularity theory of such Dirac-harmonic maps. We study Dirac-harmonic maps from a Riemannian surface to an arbitrary compact Riemannian manifold. We show that a weakly Dirac-harmonic map is smooth in the interior of the domain. We also prove regularity results for Dirac-harmonic maps at the boundary when they solve an appropriate boundary value problem which is the mathematical interpretation of the D-branes of superstring theory.