Simons Satellite Meeting on Celestial Holography

Contribution List

1. Welcome

09/04/2024, 09:00

2. Bin Zhu (Edinburgh) -- Eikonal probe scattering on the celestial sphere

09/04/2024, 09:15

In this talk, I will motivate the recent studies of celestial holography on backgrounds. I will review eikonal amplitudes and their relations to probe amplitudes on a fixed background. This would allow us to compute celestial probe amplitudes on shockwaves, Schwarzchild, and Kerr backgrounds to all orders in Newton's constant G. I will also discuss the dispersion relations of the celestial...

3. Fernando Alday (Oxford) -- The AdS Virasoro Shapiro Amplitude

09/04/2024, 09:45

4. Jan de Boer (Amsterdam) -- The Statistical Interpretation of Semi-Classical Gravity

09/04/2024, 10:45

In this talk I will describe a picture which has emerged over the past few years regarding the statistical interpretation of semiclassical gravity and how this relates to wormholes, averaging and the so-called factorization puzzle, the information paradox, and a combinatorial description of 3d gravity.

5. Kasia Budzik (Perimeter Institute) -- Non-perturbative effects in twisted holography

09/04/2024, 14:00

Twisted holography relates the 2d chiral algebra subsector of N=4 SYM to the B-model topological string theory on the deformed conifold SL(2,C). Operators of order N in the chiral algebra insert Giant Graviton branes in the dual geometry. In this talk, I will present a match between the large N saddles of determinant correlation functions with semiclassical D-brane configurations in the dual...

6. Sonja Klisch (Edinburgh) -- The double copy in twistor space

09/04/2024, 14:30

The double copy is a powerful tool connecting gauge theoretic and gravitational scattering amplitudes. It was originally derived from string theory, relating the tree level amplitudes of closed string amplitudes to two copies of open string amplitudes. In the field theory limit, this reduces to being able to obtain tree-level graviton amplitudes from the "square" of tree-level gluon...

7. Ian Moult (Yale) -- Conformal Colliders Meet the LHC

09/04/2024, 15:30

I will discuss recent theoretical progress in the study of a class of asymptotic observables called energy correlators. I will show that higher point energy correlators can be computed using modern integration techniques, and present recent measurements from the LHC illustrating key physical properties of the correlators, namely their scaling behavior in OPE limits, and their shape dependence.

14. Prahar Mitra (Amsterdam) -- Celestial Conformal Primaries in Effective Field Theories

09/04/2024, 16:00

Scattering amplitudes in $d+2$ dimensions can be recast as correlators of conformal primary operators in a putative holographic CFT$_d$ by working in a basis of boost eigenstates instead of momentum eigenstates. In this talk, we show that completeness, normalizability, and consistency with CPT implies that we must restrict the boost eigenvalues of the operators to either $\Delta \in...

8. Frank Coronado (ETH Zurich) -- Determinant operators and massive amplitudes in N=4 SYM

10/04/2024, 09:00

In planar N=4 SYM, massless scattering amplitudes are dual to null polygonal Wilson loops (T-duality) or the same as the
four-dimensional null limit of stress-tensor correlators. I will present a (conjectured) generalization of this duality which equates correlators of determinant operators, in a special ten-dimensional null limit, with massive scattering amplitudes in the Coulomb branch of...

9. Per Kraus (UCLA) -- Actions and S-matrices

10/04/2024, 09:30

I discuss the formulation of the S-matrix as the evaluation of a path integral with specified asymptotic boundary conditions, along with applications to asymptotic symmetries and the flat space limit of AdS/CFT

10. Romain Ruzziconi (Oxford) -- Carrollian Amplitudes and the Flat Space Limit of AdS

10/04/2024, 10:30

Carrollian amplitudes are massless scattering amplitudes expressed in position space at null infinity. These are to be re-interpreted as correlation functions in a putative dual Carrollian CFT. I will discuss the properties of Carrollian amplitudes and their relations with celestial amplitudes. I will explain how the collinear limit unveils a notion of Carrollian OPE and deduce the action of...

11. Massimo Porrati (NYU) -- Supertranslations, Angular momentum, and Covariance in 4d Asymptotically Flat Space

10/04/2024, 11:00

I will present a supertranslation-invariant and Lorentz-covariant definition of angular momentum in asymptotically flat 4D spacetime. This definition uses only asymptotic metric data and reproduces the flux necessary to obtain known radiation reaction effects. The formula has an appealing physical interpretation, it extends to Lorentz boost charges and integrated fluxes, and agrees with other...

12. David Nichols (U. Virginia) -- Gravitational-wave memory effects as an observational window into celestial holography

10/04/2024, 14:00

The spectrum of gravitational-wave sources is rapidly broadening. At the higher-frequency end, the LIGO-Virgo-KAGRA collaboration detects black-hole mergers at a rate of roughly one every other day when the detectors are operating. At the lower-frequency end, pulsar timing arrays have found strong evidence for a stochastic gravitational-wave background. The intermediate frequencies will be...

13. Adam Ball (Perimeter Institute) -- Dynamical Edge Modes and Entanglement in Maxwell Theory

10/04/2024, 15:30

At least intuitively, edge modes in gauge theory are the finite-boundary analogues of the soft and Goldstone modes familiar from asymptotic symmetries. However, most treatments of edge modes are either limited to kinematics or view them as superselection labels. I show how to treat edge modes as dynamical degrees of freedom. I find that their contribution to the partition function resolves...

15. Kevin Costello (Perimeter Institute) -- QCD scattering amplitudes in self-dual backgrounds from large N chiral algebras

10/04/2024, 16:00

I will show how certain loop level scattering amplitudes and form factors in QCD can be realized as correlators of a large N chiral algebra. The construction goes via twisted holography for the type I string on a Calabi-Yau 5-fold related to twistor space. This is joint work with Roland Bittleston and Keyou Zeng.