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We derive the Green-Schwarz action on AdS_5 x S^5 using an alternate versionof the coset superspace construction. By Wick rotations and Lie algebraidentifications we bring the coset to GL(4|4)/(Sp(4) x GL(1))^2, which allowsus to represent the conformal transformations on unconstrained matrices. Thederivation is more streamlined even for the bosonic sector, and conformalsymmetry is manifest at every step. Kappa-symmetry gauge fixing is moretransparent.Comment: 22 pages, latex; v2: format changed to JHEP, equations 6.10 and 6.11  added, typos in eq: 3.9, 4.10, 6.14, 6.15, 6.19 correcte

Superstrings on AdS5 × S5 supertwistor space

Superstrings on AdS₅ × S⁵ supertwistor space