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Field Theory Insight from the Ads/CFT Correspondence

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Field Theory Insight from the Ads/CFT Correspondence TMR2000 PROCEEDINGS Field theory insight from the AdS/CFT correspondence Daniel Z.Freedman1 and Pierre Henry-Labord`ere2 1Department of Mathematics and Center for Theoretical Physics Massachusetts Institute of Technology, Cambridge, MA 01239 E-mail: [email protected] 2LPT-ENS, 24, Rue Lhomond F{75231 Paris C´edex 05, France E-mail: [email protected] Abstract: A survey of ideas, techniques and results from d=5 supergravity for the conformal and mass-perturbed phases of d=4 N =4 Super-Yang-Mills theory. 1. Introduction while the phases with RG-flow are described by solitons or domain wall solutions. The AdS/CF T correspondence [1, 20, 11, 12] al- The result of work by many theorists over lows one to calculate quantities of interest in cer- the last few years is a quantitative picture of the tain d=4 supersymmetric gauge theories using 5 strong coupling limit of the theory which is a re- and 10-dimensional supergravity. Miraculously markable advance on previous knowledge. In this one gets information on a strong coupling limit lecture we will survey some of the ideas, tech- of the gauge theory– information not otherwise niques, and results on the conformal and mas- available– from classical supergravity in which sive phases of the theory. We attempt to reach calculations are feasible. non-specialists and are minimally technical. The prime example of AdS/CF T is the du- ality between N =4 SYM theory and D=10 Type 2. The N =4 SYM theory IIB supergravity. The field theory has the very special property that it is ultraviolet finite and The N =4 SUSY Yang-Mills theory in d=4 with thus conformal invariant. Many years of elegant SU(N) gauge group can be obtained by dimen- work on 2-dimensional CFT0s has taught us that sional reduction of d=10 SYM. The fields consist it is useful to consider both the conformal theory of a gauge field Aµ, 4 Weyl fermions λa (in 4 of and its deformation by relevant operators which the R-symmetry group SU(4)) and 6 real scalars changes the long distance behavior and generates Xi (in 6 of SU(4)). Each of these fields can be a renormalization group flow of the couplings. taken as an N × N traceless Hermitian matrix of Analogously, in d=4, one can consider the adjoint of SU(N). The R-symmetry or fla- a) the conformal phase of N =4 SYM vor symmetry group will play a more important b) the same theory deformed by adding mass role in our discussion than the gauge group. Ex- terms to its Lagrangian plicit calculations have shown that the β func- c) the Coulomb/Higgs phase. tion of the theory is zero up to three-loop or- Conformal symmetry is broken in the last two der, and arguments for ultraviolet finiteness to cases. There is now considerable evidence that all orders have been given [21, 22, 23]. Finite- the strong coupling behavior of all 3 phases can ness implies conformal symmetry. The confor- be described quantitatively by classical super- mal group of 4-dimensional Minkowski space is gravity. In the conformal phase, the AdS5 × S5 SO(4, 2)∼SU(2, 2). This combines with the R- “ground state” of D=10 supergravity is relevant, symmetry SO(6)∼SU(4) and N =4 SUSY to give TMR2000 Daniel Z.Freedman1 and Pierre Henry-Labord`ere2 the superalgebra SU(2, 2|4) which is the over- 2. The scalar potential of the theory is a positive arching invariance of the theory. It contains 4N =16 quartic in Xi of the form a supercharges Qα associated with Poincar´eSUSY 2 i j 2 and 4N =16 additional conformal supercharges. V (X)=bgYMTr([X ,X ]) (2.2) The observables of the theory are the cor- relation functions of gauge invariant operators There is thus a moduli space of supersymmetric h i which are composites of the elementary fields. minima, ie V ( X )=0, in which the vacuum ex- h ii These operators are classified in irreducible rep- pectation values X are traceless diagonal ma- resentations (irreps) of SU(2, 2|4). There are trices. Generically the preserved gauge symme- N−1 many such operators, but those of chief interest try is U(1) , and the particle content at a − for AdS/CF T belong to short representations. generic point of moduli space is N 1 massless 2 − The scale dimension ∆ of these is fixed at inte- photons, N N massive gauge bosons and su- N ger or 1/2-integer values and correlated with the perpartners. This gives a representation of =4 SU(4) irrep. One basic reference on the irreps supersymmetry with central charges. of SU(2, 2|4) is [25, 24] and there is considerable 3. We will also be interested in supersymmet- information in the current literature, e.g. see [2] ric mass deformations of the theory. It is then Chiral primary operators correspond to low- convenient to describe the deformed theory us- N est weight states of short irreps. The most im- ing =1 chiral superfields Φi(i =1,2,3) whose portant ones are lowest components are complex superpositions of the 6 Xi. The deformed theory has the superpo- k (i1 i2 ik ) TrX = TrX X ...X (2.1) tential where the parentheses indicate a symmetric trace- X3 1 2 less tensor in the SO(6) indices. The rank k chi- W = g TrΦ3[Φ1, Φ2]+ m Tr(Φ ) YM 2 i i ral primary has dimension ∆=k, and the Dynkin i=1 (2.3) designation of its R-symmetry irrep is (0,k,0). The dynamics then turns out to depend very dra- The dimensions of these irreps are 20’ for k=2, matically on the pattern of the mass parameters 50 for k=3, 105 for k=4.... By applying Qa to α m . these operators, we obtain descendant operators i For m3 =06 and m1=m2=0, the methods of Seiberg in the same SU(2, 2|4) irrep. For example, the dynamics have been used [50] to show that con- descendants of TrX2 include the SU(4) flavor I formal symmetry is broken at intermediate scales, currents J and the stress tensor Tµν . µ but the theory flows to a non trivial conformal The dynamics of N =4 SYM has been much fixed point in the infrared limit. explored through the years. We now mention a For m1 =m2 =m3 =m, the supersymmetric vacua few aspects of this dynamics which will be illu- 1 2 m obey [φ ,φ ]= φ3 and are in one-to-one cor- minated later, through AdS/CF T . gYM respondence with representations of SU(2) [5]. 1. Ward identities, anomalies, and N =1 Seiberg The long distance physics depends on which vac- dynamics can be combined [26] to show that 2- uum is chosen, and gauge symmetry can be real- point functions of flavor currents and stress ten- ized in both confined and Higgsed phases. sor are not renormalized. This means that all We have time and space here to discuss only the radiative corrections vanish and the exact cor- holographic dual of the first mass deformation relation functions are given by the free-field ap- [6], despite extremely interesting recent work on proximation. Using N =1 conformal superspace the second [31, 41, 51]. [4], this result can be extended to 2- and 3-point functions of the lowest chiral primary TrX2 and all descendents. Similar results can be derived 3. D=10 Type IIB Supergravity using extended superspace [3]. It is also known that 4-point correlation functions do receive ra- The bosonic fields of the D=10 IIB supergravity diative corrections, so the theory is not secretly consist of a metric g, a scalar dilaton φ and axion a free theory. C, two three-forms and a self-dual five-form F5. 2 TMR2000 Daniel Z.Freedman1 and Pierre Henry-Labord`ere2 The classical equations admit as exact back- sional reduction process is already very compli- 5 5 ground AdS5 × S with F5=Nvol(S ). N comes cated at the linear level, since the independent from flux quantization. The fields φ and C are (i.e. uncoupled) 5-dimensional fields are actu- constant and the other fields vanishes. ally mixtures of those in the 10-dimensional the- The complete Kaluza-Klein mass spectrum ory [8]. The nonlinear interactions are even more 5 on AdS5 × S was obtained in [8]. It is organized complicated, and they have been worked out in into super-multiplets whose component fields are only a few sectors of the theory [18]. in representations of the SO(6) isometry group On the other hand there is a known complete of S5. The lowest multiplet contains the graviton nonlinear 5-dimensional supergravity theory, the and its super-partners: gauged N =8 theory of [10, 9] which contains the α ∗ (gµν ,ψµ in the 4 +4 ,Aµ in the 15, Bµν in fields of the graviton multiplet above and is in- ∗ ∗ i the 6c, λ in the 4 +10+4 +10 , the scalars ϕ variant under the same superalgebra. This D=5 ∗ N in the 1c +10+10 +20) =8 theory is believed to be a consistent trun- 5 Each of these fields is the lowest state of cation of the Type IIB theory on AdS5 × S . a Kaluza-Klein tower of fields. For example a This means that any classical solution of the D=5 scalar of the D=10 theory can be expanded as theory can be lifted to an exact solution of the D=10.
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