Japan-UK Workshop on Quantum Gravity

Contribution List

20. Opening Remarks

Masazumi Honda (RIKEN iTHEMS / Saitama University)

22/09/2025, 09:25

1. Recent developments in double-scaled SYK

Kazumi Okuyama

22/09/2025, 09:30

SYK model is an interesting toy model of holographic duality. In particular, the so-called double-scaled SYK (DSSYK), which is defined by taking a large N limit with the number p of the p-body interaction scaled as p=N^(1/2), has attracted a lot of attention recently since DSSYK is exactly solvable thanks to the underlying quantum group symmetry. In this talk, I will briefly review the recent...

2. T Tbar and Sqrt(T Tbar) deformations in 4d Chern-Simons Theory

Masahito Yamazaki

22/09/2025, 11:00

3. Higher point N=4 SYM correlators

Paul Heslop

22/09/2025, 14:30

4. Giant Gravitons, Volume Minimisation, M2/M5 Duality, and Vertex Algebras

Nick Dorey

22/09/2025, 16:00

7. Resonances, Spectral Theory, and the Resurgent Structure

Okuto Morikawa

23/09/2025, 09:30

An attempt is made to unify the understanding of resonance phenomena, analytic spectra, and resurgence by developing and applying a mature exact-WKB framework. We begin by formulating non-perturbative resonances in quantum mechanics via the exact WKB method, demonstrated concretely in the inverted Rosen–Morse potential, where barrier resonances and quasi-stationary states are shown to match...

8. AdS string amplitudes from single-valuedness

Tobias Hansen (Durham University)

23/09/2025, 11:00

It has long been known that string theory amplitudes have intriguing single-valuedness properties. When considering string theories on curved backgrounds, which are still lacking a complete worldsheet description, these properties become even richer. For AdS/CFT, single-valuedness can be combined with the structure of the OPE in the dual CFT to fix AdS string amplitudes in a small curvature...

9. Extremal Couplings and Gluons in AdS/CFT

Rishi Mouland

24/09/2025, 09:30

In AdS/CFT, extremal couplings induce a mixing between single- and double-trace operators. I will diagnose this mixing and compute it coefficient using the conformal block expansion of 4-point Witten diagrams involving extremal couplings. I will then study the simplest dual pair in which such couplings arise: 4d N=2 theories dual to AdS5 x S5 with some 7-branes. Summing a tower of extremal...

10. Yang-Mills/QCD on R2xT2, adiabatic continuity, and eta' potential

Yuya Tanizaki

24/09/2025, 11:00

We show that 4d Yang-Mills/QCD can be semi-classically solved on R2xT2 with nontrivial 't Hooft flux. In this setup, 4d instanton splits into N center-vortex fractional instantons, and its dilute gas describes qualitative features of 4d confinement vacua via the adiabatic continuity. When we apply this technique to QCD with fundamental quarks, we can learn about the global structure of the...

11. Towards Celestial Holography for Self-Dual Einstein Gravity

David Skinner

24/09/2025, 14:30

Celestial Holography posits the existence of a holographic description of gravitational theories in asymptotically flat space-times. To date, top-down constructions of such dualities involve a combination of twisted holography and twistor theory. The gravitational theory is the closed string B model living in a suitable twistor space, while the dual is a chiral 2d gauge theory living on a...

12. Quantum Cosmology from Perturbative and Non-Perturbative Perspective

Hiroki Matsui

24/09/2025, 16:00

13. Integrable Regge Trajectories of N=4 SYM

Simon Ekhammar

25/09/2025, 09:30

Maximally supersymmetric four-dimensional Yang-Mills appear to be solvable in the planar limit. In particular, the non-perturbative spectrum of local operators can be calculated using the integrability-based Quantum Spectral Curve (QSC) formalism. However, the usefulness QSC extends beyond local operators. I will demonstrate how it can be used to understand what happens upon analytic...

14. Comments on Deep Learning as a String Theory

Simeon Hellerman

25/09/2025, 11:00

21. Photo

25/09/2025, 12:00

15. Gravitational Waveform from Amplitudes

Alessandro Georgoudis

25/09/2025, 14:30

In this talk I will present some recent developments in the study of classical observables for gravitational waves physics. This topic has received a lot of attention in the recent years due to the observation of gravitational waves emitted by black hole mergers. Our approach will be based on quantum scattering amplitudes methods, which have been developed to study scattering of fundamental...

16. Resumming perturbations in curved spacetime - Black hole QNMs via exact WKB

Ryo Namba

25/09/2025, 16:00

Divergences in perturbative expansions often signal the
presence of rich physics. Perturbations around curved spacetime can be
systematically handled using the (J)WKB series. However, while being
asymptotic expansions, these series are typically divergent. Recent
developments have demonstrated that exact WKB analysis, combined with
Borel resummation, provides a powerful framework to go...

17. To boost or not to boost, that’s the question: dS/CFT vs dS/SFT

Yu Nakayama

26/09/2025, 09:30

18. Multiparty entanglement and holography

Simon Ross

26/09/2025, 11:00

19. Concluding Remarks

26/09/2025, 12:00