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In a previous paper hep-th/0410182 we constructed wave functions and vertexoperators for massless supergravity fields in type IIB matrix model byexpanding supersymmetric Wilson line operators. In this paper we considerfermionic backgrounds and condensation of supergravity fields in IIB matrixmodel by using these wave functions. We start from the type IIB matrix model ina flat background whose matrix size is $(N+1) \times (N+1)$, or equivalentlythe effective action for $(N+1)$ D-instantons. We then calculate an effectiveaction for $N$ D-instantons by integrating out one D-instanton (which we call amean-field D-instanton) with an appropriate wave function and show that variousterms can be induced corresponding to the choice of the wave functions. Inparticular, a Chern-Simons-like term is induced when the mean-field D-instantonhas a wave function of the antisymmetric tensor field. A fuzzy sphere becomes aclassical solution to the equation of motion for the effective action.  We also give an interpretation of the above wave functions from the stringtheory side as overlaps of the D-instanton boundary state with closed stringmassless states in the Green-Schwarz formalism.Comment: 32 pages, Latex; discussion clarified. version to appear in Phys.  Rev.

Fermionic backgrounds and condensation of supergravity fields in the type IIB matrix model