We study a class of heavy-heavy-light-light (HHLL) integrated correlators of superconformal primary operators in SU($\textit{N}$) $$ \mathcal{N} $$ = 4 super Yang-Mills theory involving two light operators from the stress-tensor multiplet and two heavy operators whose conformal dimensions are proportional to the number of colours $\textit{N}$. In the large-$\textit{N}$ limit these heavy operators are dual to sphere and AdS giant gravitons, realised holographically as D3-branes wrapping an $\textit{S}$ inside either the $\textit{S}$ or the $\textit{AdS}$ factor of the $\textit{AdS}$ × $\textit{S}$ background geometry. These HHLL correlators thus describe the scattering of two gravitons off D3-branes. In the planar limit we derive exact expressions for the HHLL integrated correlators as functions of both the ’t Hooft coupling and the giant graviton dimension. Remarkably, despite exhibiting distinct perturbative expansions at weak coupling, these integrated correlators share the same universal asymptotic series at strong coupling. We also demonstrate that a seemingly unrelated integrated correlator in a USp(2$\textit{N}$) $$ \mathcal{N} $$ = 2 gauge theory, holographically dual to gluon-graviton scattering off D7-branes, exhibits precisely the same strong coupling asymptotic series. This reveals a striking universality of D-brane scattering processes. Furthermore, we compute the exponentially suppressed corrections at strong coupling for all these observables, showing that they are precisely the non-perturbative effects that account for the differences between these integrated correlators beyond the universal asymptotic series. Finally, we comment on the resurgent properties and the holographic interpretation of these exponentially suppressed terms.

United Kingdom

Augustus Brown

Daniele Dorigoni

Francesco Galvagno

Congkao Wen

Universality of giant graviton correlators

We study the large-charge sector of $$\mathcal{N}$$ = 4 super Yang-Mills theory (SYM) with SU($\textit{N}$) gauge group by constructing a special class of half-BPS heavy operators, termed “canonical operators”. Such operators exhibit remarkable simplicity in the large-charge ’t Hooft limit, where the dimension of the operators ∆ → ∞ with $${\Delta g}_{\text{YM}}^{2}$$ held finite. Canonical operator insertions in this regime map $$\mathcal{N}$$ = 4 SYM onto the Coulomb branch, by assigning a classical profile to the scalar fields with non-vanishing values along the diagonals given by the roots of unity. We follow a semiclassical approach to study two-point, three-point and Heavy-Heavy-Light-Light (HHLL) correlators. In particular we show that HHLL correlators in the large-charge ’t Hooft limit are computed as two-point functions in a background determined by the classical profiles. We provide consistent evidence of our findings by computing the same observables via supersymmetric localization.

Switzerland

Alba Grassi

Cristoforo Iossa

Large charge meets semiclassics in $$\mathcal{N}$$ = 4 super Yang-Mills

This paper introduces a novel systematic construction of gapped domain walls (GDWs) within the Levin-Wen (LW) model. By gluing two LW models along their open sides in a compatible way, we achieve a complete GDW classification by subsets of bulk input data, which encompass the classifications in terms of bimodule categories. A generalized bimodule structure is introduced to capture domain-wall excitations. Furthermore, we demonstrate that folding along any GDW yields a gapped boundary (GB) described by a Frobenius algebra of the input UFC for the folded model, thus bridging our GDW classification and the GB classification in [1].

China

Yanyan Chen

Siyuan Wang

Yu Zhao

Yuting Hu

Yidun Wan

Classification of gapped domain walls of topological orders in 2+1 dimensions: a Levin-Wen model realization

We study particular integrated correlation functions of two superconformal primary operators of the stress tensor multiplet in the presence of a half-BPS line defect labelled by electromagnetic charges ($\textit{p}$, $\textit{q}$) in $$ \mathcal{N} $$ = 4 supersymmetric Yang-Mills theory (SYM) with gauge group SU($\textit{N}$). An important consequence of SL(2, $\textit{ℤ}$) electromagnetic duality in $$ \mathcal{N} $$ = 4 SYM is that correlators of line defect operators with different charges ($\textit{p}$, $\textit{q}$) must be related in a non-trivial manner when the complex coupling $\textit{τ}$ = $\textit{θ}$/(2$\textit{π}$) + $$ 4\pi i/{g}_{\textrm{YM}}^2 $$ is transformed appropriately. In this work we introduce a novel class of real-analytic functions whose automorphic properties with respect to SL(2, $\textit{ℤ}$) match the expected transformations of line defect operators in $$ \mathcal{N} $$ = 4 SYM under electromagnetic duality. At large $\textit{N}$ and fixed $\textit{τ}$, the correlation functions we consider are related to scattering amplitudes of two gravitons from extended ($\textit{p}$, $\textit{q}$)-strings in the holographic dual type IIB superstring theory. We show that the large-$\textit{N}$ expansion coefficients of the integrated two-point line defect correlators are given by finite linear combinations with rational coefficients of elements belonging to this class of automorphic functions. On the other hand, for any fixed value of $\textit{N}$ we conjecture that the line defect integrated correlators can be expressed as formal infinite series over such automorphic functions. The resummation of this series produces a simple lattice sum representation for the integrated line defect correlator that manifests its automorphic properties. We explicitly demonstrate this construction for the cases with gauge group SU(2) and SU(3). Our results give direct access to non-perturbative integrated correlators in the presence of an ’t Hooft-line defect, observables otherwise very difficult to compute by other means.

Germany

Zhihao Duan

Italy

Daniele Pavarini

United States

Haitian Xie

Electromagnetic duality for line defect correlators in $$ \mathcal{N} $$ = 4 super Yang-Mills theory

We study Heavy-Heavy-Light-Light (HHLL) correlators   <math> <mfenced> <mrow> <mi>HH</mi> <msub> <mi>O</mi> <mn>2</mn> </msub> <msub> <mi>O</mi> <mn>2</mn> </msub> </mrow> </mfenced> </math>  $$ \left\langle \mathcal{HH}{\mathcal{O}}_2{\mathcal{O}}_2\right\rangle $$  in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 super Yang-Mills theory with SU(N) gauge group at generic N. The light operator   <math> <msub> <mi>O</mi> <mn>2</mn> </msub> </math>  $$ {\mathcal{O}}_2 $$  is the dimension two superconformal primary in the stress tensor multiplet and   <math> <mi>H</mi> </math>  $$ \mathcal{H} $$  is a general half-BPS superconformal primary operator with dimension (or R-charge)   <math> <msub> <mtext>∆</mtext> <mi>H</mi> </msub> </math>  $$ {\Delta }_{\mathcal{H}} $$ . We consider the large-charge ’t Hooft limit, where   <math> <msub> <mtext>∆</mtext> <mi>H</mi> </msub> <mo>→</mo> <mo>∞</mo> </math>  $$ {\Delta }_{\mathcal{H}}\to \infty $$  with fixed ’t Hooft-like coupling   <math> <mi>λ</mi> <mo>≔</mo> <msub> <mtext>∆</mtext> <mi>H</mi> </msub> <msubsup> <mi>g</mi> <mi>YM</mi> <mn>2</mn> </msubsup> </math>  $$ \lambda := {\Delta }_{\mathcal{H}}{g}_{\textrm{YM}}^2 $$ . We show that the L-loop contribution to the HHLL correlators in the leading large-charge limit is universal for any choice of the heavy operator   <math> <mi>H</mi> </math>  $$ \mathcal{H} $$ , given as   <math> <msup> <mi>λ</mi> <mi>L</mi> </msup> <msubsup> <mo>∑</mo> <mrow> <mi>ℓ</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>L</mi> </msubsup> <msup> <mi>Φ</mi> <mfenced> <mi>ℓ</mi> </mfenced> </msup> <msup> <mi>Φ</mi> <mfenced> <mrow> <mi>L</mi> <mo>−</mo> <mi>ℓ</mi> </mrow> </mfenced> </msup> </math>  $$ {\lambda}^L{\sum}_{\ell =0}^L{\Phi}^{\left(\ell \right)}{\Phi}^{\left(L-\ell \right)} $$  with an SU(N) colour factor coefficient, where Φ(ℓ) is the ladder Feynman integral, which is known to all loops. The dependence on the explicit form of the heavy operator lies only in the colour factor coefficients. We determine such colour factors for several classes of heavy operators, and show that the large charge limit leads to minimal powers of N. For the special class of “canonical heavy operators”, one can even resum the all-loop ladder integrals and determine the correlators at finite λ. Furthermore, upon integrating over the spacetime dependence the resulting integrated HHLL correlators agree with the existing results derived from supersymmetric localisation. Finally, as an application of the all-loop analytic results, we derive exact expressions for the structure constants of two heavy operators and the Konishi operator, finding intriguing connections with the integrated HHLL correlators.

All-loop Heavy-Heavy-Light-Light correlators in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 super Yang-Mills theory

We significantly extend recent work on the kinematic Hopf algebra, a structure that was shown to underlie the color-kinematics duality in Yang-Mills (YM) theory coupled to two heavy scalars, known as the heavy-mass effective theory (HEFT) limit. First, staying in the HEFT limit, we show the same kinematic Hopf algebra can be used to obtain Bern-Carrasco-Johansson (BCJ) numerators in <math><msup><mi>DF</mi><mn>2</mn></msup><mo>+</mo><mrow><mi>YM</mi></mrow></math> theory, a theory containing an infinite number of higher derivative corrections to YM, used to obtain string amplitudes via the double copy. Second, we exploit the intricate structure induced by the massive poles to obtain an efficient and direct expression for local BCJ numerators in pure YM based on the same kinematic Hopf algebra. This demonstrates that the kinematic Hopf algebra works even beyond the HEFT limit, strongly suggesting this structure universally underlies the color-kinematics duality.

Denmark

Gang Chen

Laurentiu Rodina

Kinematic Hopf algebra and Bern-Carrasco-Johansson numerators at finite <math><msup><mi>α</mi><mo>′</mo></msup></math>

We study the four-point correlator   <math> <mfenced> <mrow> <msub> <mi>O</mi> <mn>2</mn> </msub> <msub> <mi>O</mi> <mn>2</mn> </msub> <mi>DD</mi> </mrow> </mfenced> </math>  $$ \left\langle {\mathcal{O}}_2{\mathcal{O}}_2\mathcal{DD}\right\rangle $$  in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 super Yang-Mills theory (SYM) with SU(N) gauge group, where   <math> <msub> <mi>O</mi> <mn>2</mn> </msub> </math>  $$ {\mathcal{O}}_2 $$  represents the superconformal primary operator with dimension two, while   <math> <mi>D</mi> </math>  $$ \mathcal{D} $$  denotes a determinant operator of dimension N, which is holographically dual to a giant graviton D3-brane extending along S 5. We analyse the integrated correlator associated with this observable, obtained after integrating out the spacetime dependence over a supersymmetric invariant measure. Similarly to other classes of integrated correlators in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 SYM, this integrated correlator can be computed through supersymmetric localisation on the four-sphere. Employing matrix-model recursive techniques, we demonstrate that the integrated correlator can be reformulated as an infinite sum of protected three-point functions with known coefficients. This insight allows us to circumvent the complexity associated with the dimension-N determinant operator, significantly streamlining the large-N expansion of the integrated correlator. In the planar limit and beyond, we derive exact results for the integrated correlator valid for all values of the ’t Hooft coupling, and investigate the resurgent properties of their strong coupling expansion. Additionally, in the large-N expansion with fixed (complexified) Yang-Mills coupling, we deduce the SL(2, ℤ) completion of these results in terms of the non-holomorphic Eisenstein series. The proposed modular functions are confirmed by explicit instanton calculations from the matrix model, and agree with expectations from the holographic dual picture of known results in type IIB string theory.

Exact results for giant graviton four-point correlators

Integrated correlation functions in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 supersymmetric Yang-Mills theory with gauge group SU(N) can be expressed in terms of the localised S 4 partition function, Z  N , deformed by a mass m. Two such cases are   <math> <msub> <mi>C</mi> <mi>N</mi> </msub> <mo>=</mo> <msup> <mfenced> <mrow> <mo>Im</mo> <mi>τ</mi> </mrow> </mfenced> <mn>2</mn> </msup> <msub> <mi>∂</mi> <mi>τ</mi> </msub> <msub> <mi>∂</mi> <mover> <mi>τ</mi> <mo>¯</mo> </mover> </msub> <msubsup> <mi>∂</mi> <mi>m</mi> <mn>2</mn> </msubsup> <mo>log</mo> <msub> <mfenced> <msub> <mi>Z</mi> <mi>N</mi> </msub> </mfenced> <mrow> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mrow> </msub> </math>  $$ {\mathcal{C}}_N={\left(\operatorname{Im}\tau \right)}^2{\partial}_{\tau }{\partial}_{\overline{\tau}}{\partial}_m^2\log {\left.{Z}_N\right|}_{m=0} $$  and   <math> <msub> <mi>H</mi> <mi>N</mi> </msub> <mo>=</mo> <msubsup> <mi>∂</mi> <mi>m</mi> <mn>4</mn> </msubsup> <mo>log</mo> <msub> <mfenced> <msub> <mi>Z</mi> <mi>N</mi> </msub> </mfenced> <mrow> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mrow> </msub> </math>  $$ {\mathcal{H}}_N={\partial}_m^4\log {\left.{Z}_N\right|}_{m=0} $$ , which are modular invariant functions of the complex coupling τ. While   <math> <msub> <mi>C</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{C}}_N $$  was recently written in terms of a two-dimensional lattice sum for any N and τ,   <math> <msub> <mi>H</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{H}}_N $$  has only been evaluated up to order 1/N 3 in a large-N expansion in terms of modular invariant functions with no known lattice sum realisation. Here we develop methods for evaluating   <math> <msub> <mi>H</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{H}}_N $$  to any desired order in 1/N and finite τ. We use this new data to constrain higher loop corrections to the stress tensor correlator, and give evidence for several intriguing relations between   <math> <msub> <mi>H</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{H}}_N $$  and   <math> <msub> <mi>C</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{C}}_N $$  to all orders in 1/N. We also give evidence that the coefficients of the 1/N expansion of   <math> <msub> <mi>H</mi> <mi>N</mi> </msub> </math>  $$ {\mathcal{H}}_N $$  can be written as lattice sums to all orders. Lastly, these large N and finite τ results are used to accurately estimate the integrated correlators at finite N and finite τ.

Luis Alday

Shai Chester

Michael Green

Relations between integrated correlators in   <math> <mi>N</mi> </math>  $$ \mathcal{N} $$  = 4 supersymmetric Yang-Mills theory

We study integrated correlators of four superconformal primaries <math><mrow><msub><mrow><mi>O</mi></mrow><mrow><mi>p</mi></mrow></msub></mrow></math> with arbitrary charges <math><mi>p</mi></math> in <math><mi>N</mi><mo>=</mo><mn>4</mn></math> super Yang-Mills theory. The <math><mo>⟨</mo><msub><mi>O</mi><mn>2</mn></msub><msub><mi>O</mi><mn>2</mn></msub><msub><mi>O</mi><mi>p</mi></msub><msub><mi>O</mi><mi>p</mi></msub><mo>⟩</mo></math> integrated correlators can be computed by supersymmetric localization, whereas correlators with more general charges are currently not accessible from this method and, in general, contain complicated multiple zeta values. Nevertheless, we observe that, if one sums over the contributions from all different channels in a given correlator, then all the multiple zeta values (and products of <math><mi>ζ</mi></math>’s) cancel, leaving only <math><mi>ζ</mi><mo>(</mo><mn>2</mn><mo>ℓ</mo><mo>+</mo><mn>1</mn><mo>)</mo></math> at <math><mo>ℓ</mo></math> loops. We then propose an exact expression of such integrated correlators in the planar limit, valid for arbitrary ‘t Hooft coupling. The expression matches with the known exact localization-based results for specific charges, as well as with all existing perturbative and strong-coupling results in the literature for more general charges. As an application, our result is used to determine certain seven-loop Feynman integral periods and fix previously unknown coefficients in the correlators at strong coupling.

Paul Heslop

Integrated Correlators in <math><mrow><mi>N</mi><mo>=</mo><mn>4</mn></mrow></math> Supersymmetric Yang-Mills Theory beyond Localization

Recently it has been shown that Bern-Carrasco-Johansson (BCJ) numerators of colour-kinematic duality for tree-level scattering amplitudes in Yang-Mills theory (coupled with scalars) can be determined using a quasi-shuffle Hopf algebra. In this paper we consider the same theory, but with higher-derivative corrections of the forms α′F 3 and α′2 F 4, where F is the field strength. In the heavy mass limit of the scalars, we show that the BCJ numerators of these higher-derivative theories are governed by the same Hopf algebra. In particular, the kinematic algebraic structure is unaltered and the derivative corrections only arise when mapping the abstract algebraic generators to physical BCJ numerators. The underlying kinematic Hopf algebra enables us to obtain a compact expression for the BCJ numerators of any number of gluons and two heavy scalars for amplitudes with higher-derivative operators. The pure gluon BCJ numerators can also be obtained from our results by a simple factorisation limit where the massive particles decouple.