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**Type IIB Supergravity, D3 branes and ALE manifolds**

Based on recent work by: M. Bertolini, G. Ferretti, (P. F.) M. Trigiante, L. Campos, P. Salomonson hep-th M.Billo, (P.F.), C. Herman, L. Modesto, I. Pesando (to appear)

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Introduction There are interesting solutions of type IIB theory, named fractional D3 branes. The gauge duals are non-conformal N=2 gauge theories in d=4 Fractional branes are commonly viewed as 5-branes wrapped on a vanishing cycle of transverse space Transverse space is R2 x R4/G. We have found a supersymmetric (BPS) D3-brane solution where transverse space is R2 x ALE In the orbifold limit we recover fractional branes The warp factor is determined by a harmonic equation on ALE In Eguchi Hanson case the harmonic equation reduces to a confluent Heun equation Open questions on the boundary action and the gauge dual.

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Type IIB Sugra The D3 brane couples to C[4] whose field strength involves a Chern Simons of lower forms Castellani & Pesando (1991) established geometric formulation

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**The SL(2,R)~SU(1,1) structure**

The solvable Lie algebra parametrization of the coset naturally introduces the dilaton and the RR 0-form

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**The FDA defining the Theory**

Note the Chern Simons As for all supergravities the algebraic structure is encoded in an FDA. (D’Auria, Fré, (1982), Castellani, P. Van Nieuwenhuizen, K. Pilch (1982)

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**Supergravity People @ Stony Brook 1982**

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**Always running to get ahead .........**

while Sergio relaxes in L.A! Ops!.. I was also there but do not tell anybody....

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**The rheonomic parametrizations~susy rules**

Fermionic Components are expressed in terms of space-time components

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**Our task: the equations to be solved**

Note that these equations are written in flat indices and appear as cosntraints on the curvature components

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**Fractional Branes= D3 branes on orbifolds C2/G**

In the dual gauge theory, x4+ix5 makes the complex scalar of the vector multiplet while x6, x7 , x8 , x9 constitute the scalar part of a hypermultiplet Susy is halved in the bulk by restricted holonomy

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**ALE manifolds as orbifold resolutions**

ALE manifolds are related to the ADE classification of Lie algebras. They can be obtained as suitable Hyperkahler quotients of flat HyperKahler manifolds Kronheimer construction of ALE spaces is realized by String Theory

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**ALE Manifolds: main relevant feature**

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**The ansatz: Holomorphic field Note the essential use of the harmonic**

2 forms dual to the homology cycles of ALE Holomorphic field

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**Pinpointing the sources:**

This is the real problem of interpretation: what is the source of B,C fields? Even without D3 brane charge there is effective source for 5-form

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Killing spinors I:

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Killing spinors II:

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Killing spinors III: Two solutions because of SU(2) holonomy of ALE

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**Harmonic equation in the Eguchi Hanson case**

Explicit form of the compact harmonic 2-form and “intersection function” Note factorization of near cycle metric

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**The partial Fourier transform**

Makes Laplace Equation on ALE x R2 inhomogeneous

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**Heun confluent equation**

D3 brane charge Fixed by boundary conditions

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**Asymptotics and the charges**

The D3 brane charge determines the coefficient of the irregular solution near the cycle Asymptotic flatness fixes the coefficient of the irregular solution at infinity

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**Power series and questions**

See picture

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**Interpolation and singularity**

Far from the cycle we just see the charge of a normal D3 in D=10 Near the cycle we see a D3 brane in D=8. It is as if we had compactified sugra on an S2

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**The World Volume Action**

Kappa supersymmetric: the fermions are hidden in the p—forms that are superforms The interactions of world—volume fields (fluctuations from vacuum values) feel all the bckg fields. Yet this action is source only for C4.. Where is the source of A[2]L ? Red=Auxiliary fields Brown=Sugra bckg fields Blue=World volume fields This is the open question answering the which will shed light on the real nature of fractional branes

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**The End Such people are always running when someone watches..........**

Let us make an appointment for all supergravity people to be back here for 50 Such people are always running when someone watches

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