Simplifying and Extending the AdS₅xS⁵ Pure Spinor Formalism

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Although the AdS₅xS⁵ worldsheet action is not quadratic, some features of the pure spinor formalism are simpler in an AdS₅xS⁵ background than in a flat background. The BRST operator acts geometrically, the left and right-moving pure spinor ghosts can be treated as complex conjugates, the zero mode measure factor is trivial, and the b ghost does not require non-minimal fields. Furthermore, a topological version of the AdS₅xS⁵ action with the same worldsheet variables and BRST operator can be constructed by gauge-fixing a G/G principal chiral model where G=PSU(2,2|4). This topological model is argued to describe the zero radius limit that is dual to free N=4 super-Yang-Mills and can also be interpreted as an "unbroken phase" of superstring theory.