Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-08-18
Nucl.Phys.B825:1-37,2010
Physics
High Energy Physics
High Energy Physics - Theory
30 pages
Scientific paper
10.1016/j.nuclphysb.2009.09.011
We consider the AGT relation, expressing conformal blocks for the Virasoro and W-algebras in terms of Nekrasov's special functions, in the simplest case of the 4-point functions for the first non-trivial W_3 algebra. The standard set of Nekrasov functions is sufficient only if additional null-vector restriction is imposed on a half of the external $W$-primaries and this is just the case when the conformal blocks are fully dictated by W-symmetry and do not depend on a particular model. Explicit checks confirm that the AGT relation survives in this restricted case, as expected.
Mironov Aleksej
Morozov Alexander
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