Spin Chain in Gauge Theory and Holography Yong-Shi Wu Department of Physics, University of Utah, Center for Advanced Study, Tsinghua University, and Shanghai.

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Presentation transcript:

Spin Chain in Gauge Theory and Holography Yong-Shi Wu Department of Physics, University of Utah, Center for Advanced Study, Tsinghua University, and Shanghai Institute for Advanced Study, USTC Collaborators: Bin Chen and Xiao-Jun Wang

Motivation: Holography The Gauge/String Theory Duality (t ’ Hooft; Polyakov: 1970 ’ s) The Holographic Principle (t ’ Hooft, 1993) The AdS/CFT(SCYM) Correspondence (Maldacena, 1997) The key to understand holography: to find string in gauge theory!

Gauge/String Theory Duality (History) ‘ t Hooft large-N Limit: (say, for U(N) group) N ∞, g 0, with fixed Planar diagram are dominant Summation of planar diagrams = Emergence of string worldsheet In (confining) QCD, Color flux tube = QCD string or in loop equation formalism, Wilson loop = a sort of string-like dynamical variable

Maldacena Conjecture: AdS/SCYM (AdS/CFT) Duality IIB string theory on (w/ N 5-flux) = D=4, Ñ=4 SYM (w/ U(N) gauge group) Share same symmetry groups A realization of holography: Bulk propagation Boundary correlations Plane-wave (BMN) limit: Boosting along an angular direction on Plane gravitaional wave background IIB string theory in plane wave limit is solvable New way to AdS/SCYM duality Calculate anomalous dimension in Ñ=4 SYM Compare with string spectrum in plane wave

BMN limit in Ñ=4 SYM Bosonic Field content: adjoint J(=L) rotates Δ measures the dimension The BMN limit fixed So fixed and fixed is allowed (Perturbative regime in SYM is now allowed!)

Spin Chain in SYM (I) (Minahan and Zarembo, 2002) Consider long composite operators They get mixed under one-loop renormalization: Anomalous Dimension Matrix

Spin Chain in SYM (II): Planar One-Loop Results Large-N Planar Nearest-neighbor interactions Γ is the Hamiltonian of an integrable SO(6) spin chain! ∙ ∙ ∙

A Gauge Theory Dual for Open Strings (I) Trick: Adding D-branes: where open string ends Doing orientifolding: un-oriented strings AdS^5xS_5/Z_2 Orientifold: O7-Plane + 4 D7-branes: at 2N D3-branes: in,, directions Near-Horizon Limit of D3-branes: Neumann: to, ; Dirichlet:

A Gauge Theory Dual for Open Strings (II) Gauge Theory Dual: D=4, Ñ=2 Sp(N) theory Vector multiplet: (V,W) adjoint Hypermultiplet: (Z,Z’) anti-symmetric (3,3) strings 4 Hypermultiplets: fundamental (A=1,..,4) (3,7) strings In Ñ=1 language, V: vector supermultiplet All others: chiral supermultiplets Superpotential: Ŵ ~

Anomalous Dimension and Open Spin Chain Composite operators: ( Ф =Z,Z’,W; Ω = invariant 2-tensor) “quarks” Bulk Interactions: the same as in D=4, Ñ=4 SYM (A Theorem) Bdry Interactions: additional Feynman diagrams! integrable bdry terms! ∙ ∙ ∙ Γ is the Hamiltonian of an integrable open SU(3) spin chain!

Matching Open String Spectrum Open string Spectrum: Algebraic Bethe Ansatz: Ground state: (Ferromagnetic pseudo-vacuum) Single Z ’ excitation (in Neumann direction; Δ -L=2) Single W excitation (in Dirichlet direction; Δ -L=2)

Further Developments Higher orders and non-planar diagrams two-, three loops: numerical Non-planar: NNN-interactions ? To all orders, a long-ranged spin chain? Semi-classical spinning strings: Beyond BMN SO(6) rank 3 allowing three commuting Start with classical solutions (Eqs of motion plus Virasoro) For two or three large J ’ s, semi-classical analysis (Tseytin et al.) Open spinning strings and open spin chains (Chen, Wang and Wu) Incorporating fermions: PSU(2,2|4) spin chain? (Beisert, Staudacher, et al.) Other Susy scalar or gauge field theories: Orbifolded gauge theories, Wess-Zumino models: (Wang and Wu; Rioban) Spin-chain induced nonlinear sigma models: (Kruczenski and et al.) ? Toward a more precise formulation of gauge/string duality?

Summary Integrable spin chain emerges in perturbative gauge theories, out of Feynman diagrams! Gauge/string duality can now be tested at string level (beyond supergravity) for plane-wave limit and spinning strings Implications: The door is just open for having  A profound relation between Yang-Baxter and Yang-Mills  better understanding of Holography, namely AdS/CFT or gauge/string theory duality

Speculations There seems to be interesting integrable or quantum group (e.g. Yangian) symmetry structure hidden in (perturbative) gauge or string theory (related to twistors?). There should be new way to formulate or construct string theory (using gauge theory or discrete spin chain).