N = 2 CHERN-SIMONS MATTER THEORIES: RG FLOWS AND IR BEHAVIOR. Silvia Penati. Perugia, 25/6/2010
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1 N = 2 CHERN-SIMONS MATTER THEORIES: RG FLOWS AND IR BEHAVIOR Silvia Penati Perugia, 25/6/2010
2 Motivations AdS 4 /CFT 3 correspondence states that the strong coupling dynamics of a N = 6 Chern-Simons theory for U(N) k U(N) k with bifundamental matter is described by M theory on AdS 4 S 7 /Z k Aharony, Bergman, Jafferis, Maldacena The field theory is at its superconformal fixed point According to the dual supergravity description the IR fixed point should be stable
3 Isolated fixed points? Questions If not, how are they connected to other fixed points? Are the fixed points IR stable against marginal deformations? Generalizations of AdS 4 /CFT 3 correspondence: tests of predictions done from the dual sugra side PERTURBATIVE INVESTIGATION
4 Plan of the talk Introduction to the AdS 4 /CFT 3 correspondence N = 2 Chern Simons matter theories. Quantization in superspace Spectrum of fixed points (superconformal field theories with different degrees of susy) Study of RG flows and IR stability of fixed points
5 ABJM/ABJ like theories ABJM/ABJ like theories with flavors N = 2, 3 Chern Simons theories with different CS levels Summary and conclusions Marco S. Bianchi, S.P., M. Siani, JHEP 1001:080,2010 JHEP 1005:106,2010
6 Naively CFT 3 is the low energy dynamics of D2 branes (Type IIA string theory) and lives at the boundary of AdS 4. AdS 4 arises from AdS 4 S 7 compactifications in M theory We expect CFT 3 to describe the low energy dynamics of a stack of M2 branes S 7 has SO(8) isometry group. We expect a N = 8 3D theory Which kind of theory do we obtain? Is it a 3D SYM?
7 3D peculiarities M2 branes are described by 8 scalar dof. No dynamical gauge fields. In M theory there is no dilaton, so no free parameter to be interpreted as coupling constant In 3D the gauge coupling is dimensionful
8 Possible solution CHERN SIMONS THEORY S CS = K d 3 xɛ µνρ Tr (A µ ν A ρ + 23 ) A µa ν A ρ + MATTER (8 real scalars)
9 BLG and ABJM theories Bagger, Lambert, PRD75: (2007), PRD77:065008, JHEP 0802:105 (2008) Gustavsson, NPB807: (2009) Aharony, Bergman, Jafferis, Maldacena, JHEP0810 (2008) Van Raamsdonk, JHEP0805 (2008) Benna, Klebanov, Klose, Smedback, JHEP0809 (2008) CS theory for U(N) k U(N) k, (A I, B I ) matter A I (N, N) B I ( N, N) I = 1, 2 and maximal symmetric superpotential (SU(2) A SU(2) B global symmetry) W = ɛ IJ ɛ KL Tr ( A I B K A J B L )
10 S = k 2π d 3 x d 4 θ dt Tr [V D ( ) α e tv D α e tv ˆV D ( ) ] α e t ˆV t ˆV D α e d 3 x d 4 θ Tr (ĀA e V A A e ˆV + B ) A e ˆV B A e V + 2π k d 3 x d 2 θ Tr [ ] (A 1 B 1 A 2 B 2 ) (A 2 B 1 A 1 B 2 ) SU(2) R SU(2) A SU(2) B SU(4) R N = 6 supersymmetry (N = 8 supersymmetry when N = 2)
11 U(N) k U(N) k CS THEORY WITH (A I, B I ) MATTER IN THE BIFUNDAMENTAL DESCRIBES THE LOW ENERGY DYNAMICS OF N M2 BRANES IN M THEORY PROBING A C 4 /Z k SINGULARITY
12 THE CORRESPONDENCE U(N) k U(N) k CS THEORY WITH (A I, B I ) MATTER IN THE BIFUNDAMENTAL DUAL TO M THEORY ON AdS 4 S 7 /Z k AdS 4 radius R 2 α N k λ S 1 S 7 radius R 2 S 1 α ( N k 5 ) 1/6
13 N k, N k 5 M theory description k N k 5 Type IIA supergravity on AdS 4 CP 3 k N Perturbative field theory
14 GENERALIZATIONS U(N) k U(M) k CS theory with the same matter content (Aharony, Bergman, Jafferis, JHEP0811 (2008)) U(N) k1 U(M) k2 with k 1 k 2. This corresponds to a 0 form flux F 0 = k 1 + k 2 in the dual description (Romans mass) (Schwarz; Gaiotto, Tomasiello) Addition of flavor matter in the fundamental of the gauge groups (Hohenegger, Kirsch; Gaiotto, Jafferis; Hikida, Li, Takayanagi)
15 Adding flavors (probe D6 branes in the AdS 4 CP 3 geometry) Q i 1 (N, 1) Q j 2 (1, M) i = 1,, N f Q i 1 ( N, 1) Qj 2 (1, M) j = 1,, N f Maximal supersymmetric superpotential (N = 3) [ 2π W flav = Tr (Q 1 Q1 ) 2 + 2π (Q 2 Q2 ) 2 k 1 k 2 + 4π k 1 Q1 (A 1 B 1 + A 2 B 2 )Q 1 + 4π k 2 Q2 (B 1 A 1 + B 2 A 2 )Q 2 ]
16 Most general N = 2 action, U(N) U(M) group S CS = d 3 x d 4 θ 1 0 dt [K 1 TrV D ( ) α e tv D α e tv + K 2 Tr ˆV D ( ) ] α e t ˆV D α e t ˆV + + d 3 x d 4 θ Tr (Āi e V A i e ˆV + B ) i e ˆV B i e V ( d 3 x d 4 θ Tr Q1 r ev Q r 1 + Q1,r Q1,r e V + Q 2 r e ˆV Q r 2 + Q2,r ) Q2,r e ˆV In general K 1 K 2 (2πK i = integers)
17 + N = 2 superpotential [ Tr h 1 (A 1 B 1 ) 2 +h 2 (A 2 B 2 ) 2 +h 3 (A 1 B 1 A 2 B 2 )+h 4 (A 2 B 1 A 1 B 2 ) +λ 1 (Q 1 Q1 ) 2 + λ 2 (Q 2 Q2 ) 2 + λ 3 Q 1 Q1 Q 2 Q2 +α 1 Q1 A 1 B 1 Q 1 +α 2 Q1 A 2 B 2 Q 1 +α 3 Q2 B 1 A 1 Q 2 +α 4 Q2 B 2 A 2 Q 2 ]
18 QUANTIZATION IN N = 2 SUPERSPACE V A (1) V B (2) = 1 1 K 1 ˆV A (1) ˆV B (2) = 1 1 K 2 ( Dα D α + αd 2 + α D 2) δ 4 (θ 1 θ 2 ) δ AB ( Dα D α + αd 2 + α D 2) δ 4 (θ 1 θ 2 ) δ AB c c = 1 c c = 1 Āâ a (1) Abˆb(2) = 1 δ4 (θ 1 θ 2 ) δ δâˆb b a
19 Perturbative evaluation of γ and β functions (K 1,2 M, N) UV divergences appear only at even orders in loops, so the first nontrivial order is two loops N = 2 CS action does not receive perturbative corrections A non renormalization theorem for the superpotential is still valid UV DIVERGENCES ONLY FROM MATTER SELF ENERGY DIAGRAMS
20 We work in dimensional regularization D = 3 2ɛ
21 Renormalizing the fields Φ = Z 1 2 Φ Φ B, Φ = Z 1 2 Φ Φ B (Φ = A I, B I, Q A, Q A ) and the couplings h j = µ 2ɛ Z 1 h j h j B α j = µ 2ɛ Z 1 α j α j B λ j = µ 2ɛ Z 1 λ j λ j B K 1,2 = µ 2ɛ K (B) 1,2
22 γ A 1 = γ B1 = 1 32π 2 [ 2NM + NN f + 1 K 2 1 2NM + 4 K 1 K 2 2NM + MN f + 1 K h 1 2 (MN + 1) + ( h h 4 2 )MN + (h 3 h4 + h 4 h3 ) ] +( α 1 2 NN f + α 3 2 MN f)
23 γ A 2 = γ B2 = 1 32π 2 [ 2NM + NN f + 1 K 2 1 2NM + 4 K 1 K 2 2NM + MN f + 1 K h 2 2 (MN + 1) + ( h h 4 2 )MN + (h 3 h4 + h 4 h3 ) ] +( α 2 2 NN f + α 4 2 MN f)
24 γ Q 1 = γ Q1 = 1 32π 2 [ 2NM + NN f + 1 K 2 1 ] +4 λ 1 2 (NN f +1)+ λ 3 2 MN f +( α α 2 2 )MN γ Q 2 = γ Q2 = 1 32π 2 [ 2NM + MN f + 1 K 2 2 ] +4 λ 2 2 (MN f +1)+ λ 3 2 NN f +( α α 4 2 )MN
25 β h1 = 4h 1 γ A 1 β h2 = 4h 2 γ A 2 β h3 = 2h 3 (γ A 1 + γ A 2) β h4 = 2h 4 (γ A 1 + γ A 2) β λ1 = 4λ 1 γ Q1 β λ2 = 4λ 2 γ Q2 β λ3 = 2λ 3 (γ Q1 + γ Q2 ) β α1 = 2α 1 (γ A1 + γ Q1 ) β α2 = 2α 2 (γ A2 + γ Q1 ) β α3 = 2α 3 (γ A1 + γ Q2 ) β α4 = 2α 4 (γ A2 + γ Q2 ) In general β i = 0 γ i = 0. Theory is finite on a 7-dim hypersurface of couplings.
26 ABJ LIKE THEORIES K 1 = K 2 K, h 1 = h 2 = 0
27 (1) NO FLAVORS Then γ A1 = γ A2 Define y 1 = h 3 + h 4 y 2 = h 3 h 4 [y1 2 Tr ( A 1 B 1 A 2 B 2 + A 2 B 1 A 1 B 2 ) + y ] 2 4 ɛ ijɛ kl Tr (A i B k A j B l ) Fixed points y 2 1(MN + 1) + y 2 2(MN 1) = 4 K 2 (MN 1) RG trajectories dy 2 dy 1 = y 2 y 1
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29 (2) We add FLAVORS with λ j = 0, α 1 = α 2 = α 3 = α 4 α γ Q 1, γ Q 2 = 0 α = 0, ± 1 K 1 + (NN f + 1)/2N 2 y 2 1(MN + 1) + y 2 2(MN 1) = 4 K 2(N 2 + NN f 1) 4α 2 NN f
30 y 1 = 0 plane
31 GENERALIZATION TO K 1 K 2 NO FLAVORS h 1 = h 2 = 0 y 2 1(MN+1)+y 2 2(MN 1) = 2(2MN+1) ( 1 K K 2 2 ) +2 2MN + 4 K 1 K 2 Fixed point with y 1 = 0 is a N = 2 superconformal theory with SU(2) A SU(2) B global symmetry
32 h 1 = h 2 0 Fixed point h 1 = h 2 = 1 2 (h 3 + h 4 ), h 3 = 1 K 1, h 4 = 1 K 2 N = 3 superconformal theory
33 h h h RG flow which connects N = 2, SU(2) A SU(2) B theory to N = 3 theory
34 ADDING FLAVORS with λ j = 0 α 1 = α 2 α 3 = α 4
35
36 Summary and conclusions We have determined the spectrum of IR fixed points for the ABJ like class of theories and their generalizations Since the fixed points are at finite distance from the UV free theory, for a suitable choice of the parameters (K 1, K 2 N, M) they can be studied perturbatively Our results are two loop exact (no planar limit) We have confirmed the IR stability of fixed points already conjectured in the literature and found a larger class of IR stable fixed points Which are the dual supergravity descriptions of the fixed points we have found? We have discussed the role of global symmetries and clarified the meaning of IR stability. (D. Green, Z. Komargodski, N. Seiberg, Y. Tachikawa and B. Wecht, arxiv: )
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41 Λ Λ Λ
42 Λ Λ Λ
43 0.010 h h h
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