Fermionic Backgrounds and Condensation of Supergravity Fields in IIB Matrix Model

Details Fermionic Backgrounds and Condensation of Supergravity Fields in IIB Matrix Model Fermionic Backgrounds and Condensation of Supergravity Fields in IIB Matrix Model

2005-03-11

arxiv.org/abs/hep-th/0503101v2

Phys.Rev. D72 (2005) 066001

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, Latex; discussion clarified. version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.72.066001

In a previous paper hep-th/0410182 we constructed wave functions and vertex operators for massless supergravity fields in type IIB matrix model by expanding supersymmetric Wilson line operators. In this paper we consider fermionic backgrounds and condensation of supergravity fields in IIB matrix model by using these wave functions. We start from the type IIB matrix model in a flat background whose matrix size is $(N+1) \times (N+1)$, or equivalently the effective action for $(N+1)$ D-instantons. We then calculate an effective action for $N$ D-instantons by integrating out one D-instanton (which we call a mean-field D-instanton) with an appropriate wave function and show that various terms can be induced corresponding to the choice of the wave functions. In particular, a Chern-Simons-like term is induced when the mean-field D-instanton has a wave function of the antisymmetric tensor field. A fuzzy sphere becomes a classical solution to the equation of motion for the effective action. We also give an interpretation of the above wave functions from the string theory side as overlaps of the D-instanton boundary state with closed string massless states in the Green-Schwarz formalism.

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