Der N=2 String auf nicht trivialen Hintergründen

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Noncommutative Solitons in Open N=2 String Theory

Coincident D2-branes in open N=2 fermionic string theory with a B-field background yield an integrable modified U(n) sigma model on noncommutative R^{2,1}. This model provides a showcase for an established method (the `dressing approach') to generate solutions for integrable field equations, even in the noncommutative case. We demonstrate the technique by constructing moving U(1) and U(2) solitons and by computing their energies. It is outlined how to derive multi-soliton configurations with arbitrary relative motion; they correspond to D0-branes moving inside the D2-branes.Comment: 1+13 pages, LaTeX; v2: eq.(45) corrected, constructing of multi-solitons enhanced, one reference added; v3: minor corrections but soliton/antisoliton convention interchanged, final JHEP versio

D-Brane Scattering of N=2 Strings

The amplitudes for emission and scattering of N=2 strings off D-branes are calculated. We consider in detail the amplitudes and for the different types of D-branes. For some D-branes we find massive poles in the scattering spectrum that are absent in the ordinary N=2 spectrum.Comment: 10 pages, LaTe

Open N=2 strings in a B-field background and noncommutative self-dual Yang-Mills

In the presence of D-branes, fermionic N=2 strings in 2+2 dimensions can be coupled to a K"ahler NS-NS two-form B. We present the corresponding action which produces N=2 supersymmetric boundary conditions and discuss the Seiberg-Witten zero-slope limit. After recalling the constraints on the Chan-Paton gauge group, we demonstrate for U(n) groups that the open N=2 string with a nonzero B-field coincides on tree level with noncommutative self-dual Yang-Mills. Several misconceptions of hep-th/0011206 are corrected.Comment: 10 pages, no figures, LaTe