Twisted N=4 SYM and Integrable Conformal Fishnet Theory

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Twisted N=4 SYM and Integrable Conformal Fishnet Theory Workshop: “Supersymmetries and Quantum Symmetries” JINR, Dubna, August 3, 2017 Twisted N=4 SYM and Integrable Conformal Fishnet Theory Vladimir Kazakov (ENS, Paris) Collaborations with Ӧ. Gürdogan arXiv:1512.06704 J. Caetano and Ӧ. Gürdogan arXiv:1612.05895 N. Gromov, G. Korchemsky, S. Negro, G. Sizov arXiv:1706.04167 D. Chicherin, F. Loebbert, D. Mueller, D. Zhang arXiv:1704.01967 arXiv:1708.00007

Outline Integrability of planar N=4 SYM, including integrable deformations, allows to compute interesting physical quantities up to a very high loop order, or even exactly Anomalous dimensions computable via Quantum Spectral Curve (QCS). In work: Structure constants, correlators, qq-potential, amplitudes, etc. Can this integrability compute individual 4D Feynman graphs? Gromov, V.K., Leurent, Volin 2014 Double scaling limit of N=4 SYM: strong ɤ-deformation & weak coupling leads to non-unitary, “chiral” CFT dominated by integrable (computable!) graphs Gurdogan, V.K. 2015 “fishnet’’ (4-scalar interaction) A. Zamolodchikov 1980 “brick wall’’ (Yukawa interaction) Caetano, Gurdogan, V.K. 2016 mixture of both Very limited sets of graphs for each loop order: for many quantities one or none. Computing such quantity we compute directly the Feynman graphs Basis of integrability: conformal SU(2,2) spin chain: a window to full AdS/CFT integrability 3D twisted ABJM model in double scaling limit: regular triangular graphs Anomalous dimensions of BMN-vacuum operators dominated by wheel graphs via QSC 2

ɣ-twisted N=4 SYM and double scaling limit ɣ-twisted N=4 SYM Lagrangian: product of matrix fields → star-product Leigh, Strassler Frolov, Tseytlin Beisert, Roiban Lunin, Maldacena Double scaling limit: strong twist, weak coupling Gurdogan, V.K. 2015 Breaks all supersymmetry and R-symmetry: PSU(2,2|4)→SU(2,2)×U(1)3

Special case: bi-scalar chiral “CFT” Gurdogan, V.K. 2015 Special case: bi-scalar chiral “CFT” Special case: Zero dimensional analogue: Kostov, Staudacher 1995 Propagators Vertex: Missing “anti-chiral” vertex Very limited number of planar graphs Sieg, Wilhelm, Fokken 2013 No mass or vertex renormalization in planar limit! Sieg, Wilhelm 2016 ξ dosn’t run in planar limit, but tr(ϕ ϕ) tr(ϕ ϕ) do run. Still CFT at criticality!

Operators, correlators, graphs… Caetano, Gurdogan, V.K , 2016 Operators, correlators, graphs… Operators with M magnons in the “vacuum” of Correlators anomalous dimension “wheel” graphs UV- reduction BMN vacuum (non-protected) Typical “fishnet” structure in the bulk. Integrable! “spiderweb” graphs Multi-magnon spiral graphs Particular case, 4-point function, computed explicitly by conformal bootstrap Basso, Dixon 2017

Fishnet amplitudes in bi-scalar model Chicherin, V.K., Loebbert, Mueller, Zhong 2017 Fishnet amplitudes in bi-scalar model Single-trace correlator defined by a single multi-loop graph Typical structure – regular square lattice – “fishnet”: A disc cut out of square lattice Dual graph with light-like momenta defines bi-scalar amplitude Manifestly finite and dually conformally invariant. Integrable?

Properties of Lax operator Chicherin, V.K., Loebbert, Mueller, Zhong (2017) Properties of Lax operator Chicherin, Derkachev, Isaev (2012) SU(4) generators in fundamental SU(2,2)~SO(2,4) generators in irrep (0,Δ,0) - diagonal action on unity - intertwining Monodromy around graph (“lasso”) can be undone by these operations Feynman graph |G > invariant under action of monodromy around boundary

Examples: Yangian PDE on cross and double-cross integrals Expanding in u we get Yangian generators of level 1, etc. Differential relation of Yangian symmetry for “cross” integral - generators of conformal algebra For “double-cross”:

Fishnet graphs and integrable conformal SU(2,2) spin chain Gurdogan, V.K. 2015 Gromov, V.K , Korchemsky, Negro, Sizov 2017 Transfer-matrix generating a wheel (fishnet) graph Integrability: graph-generating transfer-matrix emerges at particular value of spectral parameter of T-matrix in principal series irrep on 4D conformal group Hence integrability of bi-scalar model is demonstrated explicitly in all orders! To compute dimensions we use the Quantum Spectral Curve of N=4 SYM

Quantum Spectral Curve of N=4 SYM Gromov, V.K., Leurent, Volin 2014 V.K., Lerent, Volin 2015 Quantum Spectral Curve of N=4 SYM QSC eqs. close on a finite number of Baxter functions of spectral parameter The multi-index I takes values on a N-hypercube (N=8 is rank of group PSU(2,2|4) ) gl(2) gl(3) gl(4) gl(8) Parametrize all Q-functions through one-index Q-functions through determinant formula Plücker QQ-relations on each face: Krichever, Lupan, Wiegmann, Zabrodin, 1994 Grassmanian structure!

(K|M)-graded Q-system and Heizenberg spin chain Tsuboi V.K., Sorin, Zabrodin V.K., Leurent, Volin. gl(3) gl(2|1) Nicest formulation of solution for spectrum of GL(N) Heisenberg spin chain “Tilting” the hypercube, i.e. fixing two diametrally opposite Q-functions on Hasse diagram, we get a super-Q-system for Heisenberg super-spin chain! Definition: Hodge dual of a Q function is the “diametrally opposite” Q-function on hypercube

Qantum Spectral Curve of AdS/CFT Gromov, V.K., Leurent, Volin 2013 V.K., Lerent, Volin 2014 su(2,2|4): choose 8 + 8 Q-functions having nice analyticity on their defining sheets Q-functions live on infinitely branching Riemann surface with fixed equidistant cuts

Qantum Spectral Curve of AdS/CFT Gromov, V.K., Leurent, Volin 2013 V.K., Lerent, Volin 2014 Large u asymptotics fixed by PSU(2,2|4) Cartan charges ɤ-deformed QSC V.K.,Marshakov,Minahan,Zarembo Beisert,V.K.,Sakai,Zarembo Monodromy around branchpoints (inspired by classical finite gap solution) Gromov, V.K. (2010) – from classical limit Gromov, Levkovich-Maslyk (2015) These Riemann-Hilbert conditions fix all physical solutions for Q-system and also conformal dimensions Δ (finite set for given charges)

γ-twisted BMN vacuum via QSC Gromov, V.K., Korchemsky, Negro, Sizov 2017 γ-twisted BMN vacuum via QSC … Consider BMN operators in bi-scalar model. Construct QSC in DS limit: Analyticity: asymptotics and Zhukovsky cuts: one short cut short cuts in lower half-plane Double scaling limit of QSC Baxter functions: At week coupling, cuts generates poles – the only source of singularities at finite u:

Results for L=3 BMN vacuum Gromov, V.K., Korchemsky, Negro, Sizov 2017 Constructing the double scaling limit of Quantum Spectral Curve (QSC) eqs. for twisted N=4 SYM we find the 2nd order Baxter equation for where two solutions satisfy at u=0 and have a “pure” large u asymptotics We can study these equations perturbatively, iterating in ξ (wrappings) and reproducing systematically, order by order, the (periods of) wheel graphs We can also study the BMN dimension with great precision numerically, at all relevant couplings

Numerics for L=3 BMN vacuum Around ξ3=0.2 dimension becomes imaginary: phase transition, finite convergency radius. What happens to the string dual?

L=3 BMN vacuum and all-loop wheel graphs Gromov, V.K , Korchemsky, Negro, Sizov Generalized to any number of spokes L is in work (Baxter equation is available)

Operators of length=3+2n and log-multiplets Gromov, V.K , Negro, Korchemsky, Sizov (to appear this week) Our Baxter eq. fixes only the charges of operator (0,Δ,0|J=3,0), not its length. It also describes operators of any length L=3+2n1+2n2 of the type Protected operators: Mixing in multiplet of operators of length L=5: protected Non-unitary mixing matrix. “Diagonalisation” means bringing to Jordan form Lower block contains usual operators with dimensions Upper block is Jordan cell, it gives log-conformal correlators: Gurarie 1993 Caetano 2016

Perturbative expansion and numerics for operators of length L>3 At L=3+4n+2 Baxter equation renders two complex conjugate dimensions At L=3+4n dimensions are real (until they hit the unitary bound Δ(ξc )=2) Numerics:

Wheel graphs from dimension of BMN vacuum Anom. dimension at M wrappings = (period of) wheel graph with M frames Gurdogan, V.K. 2015 (and discussion with Sieg, Wilhelm) Broadherst 1980 (confirmed by direct graph computation!) E.Panzer, 2015 Rieman multi-zeta numbers Gurdogan, V.K. 2015 We extracted it from Ahn, Bajnok, Bombardelli, Nepomechie 2013 and brought it to explicit MZV form

Strongly twisted ABJM in double scaling limit Caetano, Gurdogan, V.K. Strongly twisted ABJM in double scaling limit The ABJM, ‘t Hooft coupling is defined through the CS level and there are also 3 twists corresponding to SU(4) → U(1)3 Similar double scaling limit, weak coupling corresponds to large CS level where as Gauge fields, some 6-scalar and all “Yukawa” interactions decouple, ABJM becomes a chiral 3D QFT of 3 interacting scalars in 3 dimensions 3D wheel triangular fishnet graphs single magnon Chicherin, V.K., Loebbert, Mueller, Zhong Yangian invariant amplitudes: fishnet graphs cut out of triangular lattice

Conclusions and prospects Double scaling limit of twisted N=4 SYM theory produces new 4D chiral CFTs, dominated by “fishnet” graphs, explicitly integrable in planar limit at each loop order Equivalence to integrable SU(2,2) spin chain Possible to compute multi-loop graphs in 4D and 3D with fishnet structure Bi-scalar amplitudes are finite and exhibit explicit Yangian invariance Structure constants? 1/N corrections? β-functions (study of scale dependence)? quark-antiquark potential ……. in DS limit We computed from QSC exactly J=3 BMN dimensions and corresponding wheel graphs. How to compute them from conformal spin chain? Generalization to any J? Similar observation for DS limit of ɤ-deformed 3D ABJM (no conformal anomaly) Gromov, Levkovich-Maslyuk 2016 Torrens, Mamroud 2017 6D tri-scalar theory: regular hexagonal graphs. Twisted 6D SYM? Our observations shed some light on the origins of integrability of planar SYM

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