Using the conformal compensator superfields of N=2 D=4 supergravity, the Type IIB S-duality transformations are expressed as a linear rotation which mixes the compensator and matter superfields. The classical superspace action for D=4 compactifications of Type IIB supergravity is manifestly invariant under this transformation. Furthermore, the introduction of conformal compensators allows a Fradkin-Tseytlin term to be added to the manifestly SL(2,Z)-covariant sigma model action of Townsend and Cederwall.
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机译：使用N = 2 D = 4超重力的共形补偿器超场，将IIB型S对偶变换表示为将补偿器和物质超场混合的线性旋转。在这种转换下，D = 4型IIB型超重力压缩的经典超空间作用显然是不变的。此外，共形补偿器的引入允许将Fradkin-Tseytlin项添加到Townsend和Cederwall的明显SL（2，Z）-协变sigma模型作用中。
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