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New Ways to Higher Points

29 September 2025 to 2 October 2025
HU Berlin, Campus Adlershof
Europe/Zurich timezone

Dr

Contribution List

28 / 28
28. Opening remarks
Dr Burkhard Eden (Humboldt-University Berlin)
29/09/2025, 09:30
1. Algebraic Structures of Higher-Point Amplitudes
Dr V. Chestnov
29/09/2025, 10:30

Perturbative higher-point scattering amplitudes present both conceptual and computational challenges. Their Feynman integral building blocks rapidly grow in complexity in multi-scale kinematics, motivating the use of new tools from computational algebraic geometry. Viewing these integrals as twisted period integrals further reveals deep connections to the theory of D-modules and modern...
2. Correlation functions in N=2 superconformal long-quiver theories
Dr A. Testa
29/09/2025, 11:10

In this talk, I will analysis special correlation functions of chiral primary half-BPS operators in four-dimensional N=2 superconformal circular quiver theories. Supersymmetric localization reduces these observables to matrix integrals which, in the planar limit, can be expressed as certain Fredholm determinants, known in this context as generalized Tracy–Widom distribution. This...
4. Associators as calculational tools for scattering amplitudes
Dr J. Brödel
29/09/2025, 12:20
5. Genus-one coactions from zeta generators
Dr A. Kleinschmidt
29/09/2025, 13:00

The motivic coaction of multiple zeta values and multiple polylogarithms encodes both structural insights on and computational methods for scattering amplitudes in a variety of quantum field theories and in string theory. I will report on work in progress with Franziska Porkert and Oliver Schlotterer where we propose coaction formulae for iterated integrals over holomorphic Eisenstein series...
29. Analytic Evaluation of Feynman Integrals using Mellin-Barnes Representation
Dr S. Banik
29/09/2025, 13:40
6. Discussion
NN
29/09/2025, 15:00
8. Aspects of localization - matrix models in N=2 , d=4 SYM theories
Prof. M. Billo
30/09/2025, 09:00
9. Exact results and Integrated correlator in 4d N=2 SCFTs
Dr A. Pini
30/09/2025, 10:30

We consider the four-dimensional N=2 superconformal quiver gauge theory
arising from a Z2 orbifold of N=4 super Yang–Mills. Exploiting
supersymmetric localization, we analyze different types of integrated
correlators. In particular, we obtain exact expressions valid in the
large-N limit of the theory for integrated correlators involving two
Coulomb branch operators and two moment map...
10. Exact Three-Point Functions in N=2 Superconformal Field Theories
Dr G. Ferrando, G. Lefundes
30/09/2025, 11:10

We propose an integrability approach for planar three-point functions at finite coupling in N=2 superconformal field theories obtained as Z_K orbifolds of N=4 super Yang-Mills (SYM). Generalising the hexagon formalism for N=4 SYM, we reproduce the structure constants of Coulomb branch operators, previously obtained by supersymmetric localisation, as exact functions of the 't Hooft coupling....
11. 1/2 BPS Nahm pole defects in N=4 SYM
Prof. C. Kristjansen
30/09/2025, 12:20
12. Correlation Functions of Multiple Light-like Wilson Loops in N=4 SYM
Prof. J. Drummond
30/09/2025, 13:00

Scattering amplitudes are dual to polygonal light-like Wilson loops in planar N=4 super Yang-Mills theory. Here we will explore the computation of multiple light-like loops and demonstrate that many techniques familiar from the amplitude/single loop case extend to correlators of multiple loops, in particular one may use supertwistor Wilson loops, BCFW recursion and Q-bar equations to...
13. Discussion
30/09/2025, 14:20
30. Excursion
30/09/2025, 17:00

The HU Adlershof campus is situated at the historical Johannisthal airfield. We will visit a number of sites from aviation research.
14. Heavy-Heavy-Light-Light correlators in N=4 SYM
Dr C. Wen
01/10/2025, 09:00
15. A hidden permutation symmetry of squared amplitudes in N=4/ABJM theory
Dr C. Shi
01/10/2025, 10:30

The squared amplitude has emerged as a remarkable object in both planar N=4 SYM and ABJM theory. In N=4, its duality with Wilson loops and correlators implies that the N-point, L-loop squared amplitude is captured by permutation-invariant f-graphs with N+L points. By analyzing the "cusp limit" of the correlator, we establish a new double-triangle graphical rule that bootstraps f-graph...
16. Positive Geometry and Leading Singularities in Correlation Functions
Dr C. Kuo
01/10/2025, 11:10

The Correlahedron, introduced by Eden, Heslop, and Mason, provides a positive geometric framework for computing correlation functions in maximally supersymmetric Yang–Mills theory. In this talk, I will review the underlying geometry and present recent developments, particularly the introduction of chambers, which partition the space into regions corresponding to distinct physical...
17. Correlators with BPS bound states and the double-particle limit of 5pt Amplitudes in AdS5xS5
Dr F. Aprile
01/10/2025, 12:20
18. Adventures at Five Points
Dr T. Bargheer
01/10/2025, 13:00

I will consider correlation functions of five scalar BPS
operators in N=4 SYM theory from various perspectives, and
present recent results on their computation.
19. The AdS4 × CP3 Virasoro-Shapiro Amplitude
Dr T. Hansen
01/10/2025, 13:40

I will present the derivation of the AdS Virasoro-Shapiro amplitude for the scattering of gravitons in type IIA string theory on AdS4xCP3. This is achieved by combining the structure of the OPE in the AdS/CFT dual ABJM theory with an ansatz for the amplitude as a string worldsheet integral over single-valued polylogarithms. In this way we fix the first two curvature corrections, which satisfy...
20. Discussion
01/10/2025, 15:00
31. Dinner
01/10/2025, 18:00

We dine at Nolle. Nice art nouveau interior in the very heart of Mitte.

The food deal is a small starter (the same for everyone), and a main dish and a desert that you will be able to choose from a restricted menu. Iced water will be supplied. Drinks and - if you want to make them nervous, additional food - are not covered by the conference funding; the rules are unfortunately very...
21. Towards a Flat Space Carrollian Hologram from AdS/CFT
Dr R. Ruzziconi
02/10/2025, 09:00

Carrollian holography suggests that gravity in (D+1)-dimensional asymptotically flat spacetime is dual to a D-dimensional Carrollian CFT living at null infinity. I will review the current status of flat space holography and explain how this picture arises from the AdS/CFT correspondence. In particular, I will show that taking the flat space limit in the bulk corresponds to a Carrollian limit...
22. High-energy string theory and tensionless strings
Dr S. Stieberger
02/10/2025, 10:30
23. Towards a Flat Space Hologram from AdS_4/CFT_3
Dr A. Lipstein
02/10/2025, 11:10
24. Relative twisted cohomology in QFT and localization
Dr A. Pokraka
02/10/2025, 12:20
25. Dressing factors for mixed-flux AdS3× S3× T4 superstrings
Dr D. Polvara
02/10/2025, 13:00

It has been known for some years that strings on AdS3 × S3 × T4 can be described by an integrable family of non-linear sigma models with two free parameters: the string tension and the ratio between Ramond-Ramond and Neveu-Schwarz-Neveu-Schwarz fluxes. After fixing a light cone gauge it is possible to describe the worldsheet fluctuations of these strings in terms of particles whose S-matrix...
26. Discussion
02/10/2025, 14:20
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