Anomalous Strong Coupling
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- Magdalen Mills
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1 Simons Center for Geometry and Physics, Stony Brook based on [Brenno Carlini Vallilo, LM, arxiv: [hep-th] ] for a pedagogical review, [LM, arxiv: ][hep-th] ] XI Workshop on Nonperturbative QCD, Paris
2 Outline Motivations: conformal dimensions AdS/CFT Strong coupling with string theory Konishi multiplet on the string worldsheet
3 Outline Motivations: conformal dimensions AdS/CFT Strong coupling with string theory Konishi multiplet on the string worldsheet
4 Outline Motivations: conformal dimensions AdS/CFT Strong coupling with string theory Konishi multiplet on the string worldsheet
5 Outline Motivations: conformal dimensions AdS/CFT Strong coupling with string theory Konishi multiplet on the string worldsheet
6 Motivations What are anomalous dimensions in QFT? Take a local gauge invariant op O(x) = Tr φ i (x)φ i (x) In a CFT e.g. N = 4 SYM: global symmetry dilations D [D, O(x)] = i O(x) conformal dimension 2 pt functions O(x)O(y) 1 x y 2
7 Motivations What are anomalous dimensions in QFT? Take a local gauge invariant op O(x) = Tr φ i (x)φ i (x) In a CFT e.g. N = 4 SYM: global symmetry dilations D [D, O(x)] = i O(x) conformal dimension 2 pt functions O(x)O(y) 1 x y 2
8 Motivations What are anomalous dimensions in QFT? Take a local gauge invariant op O(x) = Tr φ i (x)φ i (x) In a CFT e.g. N = 4 SYM: global symmetry dilations D [D, O(x)] = i O(x) conformal dimension 2 pt functions O(x)O(y) 1 x y 2
9 What do we know about? hereafter: Planar limit N g YM = 0 : classically = 0 "engineering dimension" E.g. Tr φ i φ i has 0 = 2.
10 Turn on t Hooft coupling λ = g 2 YM N generate anomalous dimensions 0 0
11 What do we know about? hereafter: Planar limit N λ = 0 : λ << 1 classically = 0 "engineering dimension" : weak coupling planar loop expansion 0 = c 1 λ + c 2 λ
12 What do we know about? hereafter: Planar limit N λ = 0 : λ << 1 classically = 0 "engineering dimension" : weak coupling planar loop expansion 0 = c 1 λ + c 2 λ
13 λ >> 1 : strong coupling!
14 What do we know about? hereafter: Planar limit N λ = 0 : λ << 1 classically = 0 "engineering dimension" : weak coupling 0 = c 1 λ + c 2 λ λ >> 1 : strong coupling protected (BPS): 0 = 0 short non-bps: 0 4 λ +... long non-bps: 0 λ +...
15 What do we know about? hereafter: Planar limit N λ = 0 : λ << 1 classically = 0 "engineering dimension" : weak coupling 0 = c 1 λ + c 2 λ λ >> 1 : strong coupling protected (BPS): 0 = 0 short non-bps: 0 4 λ +... long non-bps: 0 λ +...
16 What do we know about? hereafter: Planar limit N λ = 0 : λ << 1 classically = 0 "engineering dimension" : weak coupling 0 = c 1 λ + c 2 λ λ >> 1 : strong coupling protected (BPS): 0 = 0 short non-bps: 0 4 λ +... long non-bps: 0 λ +...
17 @ Strong coupling? Use holography! [Maldacena 97] gauge gravity N = 4 SYM = IIB string theory on AdS 5 S 5 λ = radius 2 /α λ >> 1 = small curvature strongly coupled CFT = perturbative string theory CFT conformal dim. = E energy in AdS State of the Art: [Gromov et al. 09] conjectured a set of Y-system eqs. whose numerical solution gives (λ) at any value of the coupling. Problem: very hard coupled integral eqs.!
18 @ Strong coupling? Use holography! [Maldacena 97] gauge gravity N = 4 SYM = IIB string theory on AdS 5 S 5 λ = radius 2 /α λ >> 1 = small curvature strongly coupled CFT = perturbative string theory CFT conformal dim. = E energy in AdS State of the Art: [Gromov et al. 09] conjectured a set of Y-system eqs. whose numerical solution gives (λ) at any value of the coupling. Problem: very hard coupled integral eqs.!
19 @ Strong coupling? Use holography! [Maldacena 97] gauge gravity N = 4 SYM = IIB string theory on AdS 5 S 5 λ = radius 2 /α λ >> 1 = small curvature strongly coupled CFT = perturbative string theory CFT conformal dim. = E energy in AdS State of the Art: [Gromov et al. 09] conjectured a set of Y-system eqs. whose numerical solution gives (λ) at any value of the coupling. Problem: very hard coupled integral eqs.!
20 What do we know about? hereafter: Planar limit N λ = 0 : classically = 0 "engineering dimension" λ << 1: weak coupling λ >> 1: strong coupling 0 = c 1 λ + c 2 λ AdS/CFT dictionary BPS: 0 = 0 massless vertex op = SUGRA short non-bps: 0 4 λ +... massive vertex op = quantum strings long non-bps: 0 λ +... semi-classical strings [Beisert et al. 10]
21 What do we know about? hereafter: Planar limit N λ = 0 : classically = 0 "engineering dimension" λ << 1: weak coupling λ >> 1: strong coupling 0 = c 1 λ + c 2 λ AdS/CFT dictionary BPS: 0 = 0 massless vertex op = SUGRA short non-bps: 0 4 λ +... massive vertex op = quantum strings long non-bps: 0 λ +... semi-classical strings [Beisert et al. 10]
22 What do we know about? hereafter: Planar limit N λ = 0 : classically = 0 "engineering dimension" λ << 1: weak coupling λ >> 1: strong coupling 0 = c 1 λ + c 2 λ AdS/CFT dictionary BPS: 0 = 0 massless vertex op = SUGRA short non-bps: 0 4 λ +... massive vertex op = quantum strings long non-bps: 0 λ +... semi-classical strings [Beisert et al. 10]
23 Anomalous strong coupling = E Compute the spectrum of perturbative string states in AdS in the near flat space limit E c 0 4 λ + c 1 + c 2 4 λ + O(1/ λ) Flat space is mass n/α
24 Anomalous strong coupling = E Compute the spectrum of perturbative string states in AdS in the near flat space limit E c 0 4 λ + c 1 + c 2 4 λ + O(1/ λ) Flat space is mass n/α
25 Anomalous strong coupling: Konishi multiplet Simple string: sitting still at the center of AdS (with same quantum #s as SYM op. in the Konishi multiplet) Type IIB string σ model in AdS 5 S 5 Compute worldsheet physical state condition (Virasoro) at 1-loop T E(E 4) λ + quantum corrections = 0 Solve for E = E(λ) AdS/CFT dictionary: = E [LM+Vallilo 11]
26 Anomalous strong coupling: Konishi multiplet Simple string: sitting still at the center of AdS (with same quantum #s as SYM op. in the Konishi multiplet) Type IIB string σ model in AdS 5 S 5 Compute worldsheet physical state condition (Virasoro) at 1-loop T E(E 4) λ + quantum corrections = 0 Solve for E = E(λ) AdS/CFT dictionary: = E [LM+Vallilo 11]
27 Anomalous strong coupling: Konishi multiplet Simple string: sitting still at the center of AdS (with same quantum #s as SYM op. in the Konishi multiplet) Type IIB string σ model in AdS 5 S 5 Compute worldsheet physical state condition (Virasoro) at 1-loop T E(E 4) λ + quantum corrections = 0 Solve for E = E(λ) AdS/CFT dictionary: = E [LM+Vallilo 11]
28 Anomalous strong coupling: Konishi multiplet Simple string: sitting still at the center of AdS (with same quantum #s as SYM op. in the Konishi multiplet) Type IIB string σ model in AdS 5 S 5 Compute worldsheet physical state condition (Virasoro) at 1-loop T E(E 4) λ + quantum corrections = 0 Solve for E = E(λ) AdS/CFT dictionary: = E [LM+Vallilo 11]
29 Anomalous strong coupling: Konishi multiplet Simple string: sitting still at the center of AdS (with same quantum #s as SYM op. in the Konishi multiplet) Type IIB string σ model in AdS 5 S 5 Compute worldsheet physical state condition (Virasoro) at 1-loop T E(E 4) λ + quantum corrections = 0 Solve for E = E(λ) AdS/CFT dictionary: = E [LM+Vallilo 11]
30 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
31 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
32 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
33 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
34 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
35 Strings propagating in AdS 5 S 5 are described by a σ model on the supercoset PSU(2, 2 4)/SO(1, 4) SO(5) coset representative : g(σ, τ) g 0 }{{} global g(σ, τ) h(σ, τ) }{{} local [Metsaev+Tseytlin 98] σ model action in terms of J = g 1 dg Maurer-Cartan one-forms + appropriate ghosts (called pure spinors). Physical states: # ghost = (1, 1) vertex operators V in the BRST cohomology QV = 0, V QΛ. satisfying Virasoro constraint T V = 0. Massless vertex op s: sugra+kk modes with E O(1) [Berkovits 00]
36 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
37 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
38 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
39 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
40 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
41 [ g(σ, τ) = exp τet/ ] λ solves the worldsheet eoms vanishing BRST charge Quantize the σ model action in the background field method around g(σ, τ). Identify massive vertex operator Compute the 1-loop quantum corrections to Virasoro [LM&Vallilo 11]
42 Konishi multiplet = Vertex operators at 1st massive level V = X ( 1) X( 1) (L L) Virasoro constraint at 1-loop T V = 0 Lorentz spin (1, 1) SU(4) singlet 0 = 6 class. centr. charge massive osc. {}}{{}}{{ E( }}{ E 4 ) (E/ λ) 2 λ }{{} SO(2,4)Casimir quartic {}}{ 2 λ = 0 anomalous dim. : 0 = 2 4 λ λ + O(1/ λ) [LM&Vallilo 11] [Gromov et al. 11] [Roiban&Tseytlin 11]
43 Application: Pomeron [Brower et al. 06] Leading Regge trajectory O string ( X X) j/2 e iet leading twist op s : Tr F +ν D j 2 F ν + Compute its energy at strong coupling (j) = E(j) = j 4 λ + c 0 (j) + c 1(j) 4 λ +...
44 Application: Pomeron [Brower et al. 06] Leading Regge trajectory O string ( X X) j/2 e iet leading twist op s : Tr F +ν D j 2 F ν + Compute its energy at strong coupling (j) = E(j) = j 4 λ + c 0 (j) + c 1(j) 4 λ +...
45 Pomeron propagator at strong coupling j 0 j( = 2) = 2 2 ± λ }{{}... }{{} strong coupl. [Brower et al. 06] Interpolating j 0 (λ) at finite λ using integrability? pic from [Brower et al. 06]
46 Pomeron propagator at strong coupling j 0 j( = 2) = 2 2 ± λ }{{}... }{{} strong coupl. [Brower et al. 06] Interpolating j 0 (λ) at finite λ using integrability? pic from [Brower et al. 06]
47 THANK YOU! Artwork courtesy of Miriam W. Carothers
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