The authors build a dual harmonic superspace and write the off-shell (0,4) superspace actions, interactions, and ADHM instanton gauge field for the complementary ADHM instanton sigma model.
Conformal symmetry of superstrings on $AdS_3\times S^3\times T^4$ and D1/D5 system
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abstract
Conformal field theory of the D1/D5 system and superstrings on $AdS_3\times S^3\times T^4$ is studied with particular attention to the world-sheet fields corresponding to the $T^4$ part. A solution to the spacetime N=4 superconformal symmetry doubling and other problems is proposed. It is argued that the relevant spacetime symmetry should be based on the middle N=4 superconformal algebra. It is discussed as to why this superconformal structure has been missed so far.
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Harmonic Superspace for Ali-Ilahi's ADHM Instanton Sigma Model
The authors build a dual harmonic superspace and write the off-shell (0,4) superspace actions, interactions, and ADHM instanton gauge field for the complementary ADHM instanton sigma model.