Abstract
A U(2, 2|4)-invariant A-model constructed from fermionic
superfields has recently been proposed as a sigma model
for the superstring on AdS5 × S5. After explaining the relation
of this A-model with the pure spinor formalism, the A-model action
is expressed as a gauged linear sigma model. In the zero radius limit,
the Coulomb branch of this sigma model is interpreted as D-brane holes
which are related to gauge-invariant
= 4 d = 4 super-Yang-Mills operators. As in the
worldsheet derivation of open-closed duality for Chern-Simons theory, this
construction may lead to a worldsheet derivation of the Maldacena conjecture.
Intriguing connections to the twistorial formulation of = 4 Yang-Mills
are also noted.
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