2nd Annual Workshop on Self-Force and Amplitudes

Contribution List

1. Welcome

09/09/2025, 09:15

4. A view of binary dynamics from infinity

Radu Roiban

09/09/2025, 09:30

Quantum field theory and scattering are attractive and powerful probes of gravitational interactions. In this talk we survey the current status of scattering-based calculations for the gravitational two-body problem, their application to the bound regime and their synergy with the (gravitational) self-force.

3. High Precision Gravitational Scattering: PM, MPM, SF, EFT, EOB, TF, NR and All That

Thibault Damour

09/09/2025, 11:10

The synergies between various approaches to the 2-body problem will be reviewed, as well as the role of the EOB formalism in concretizing these synergies. High-post-Newtonian-order connections between Tutti Frutti and Worldline EFT will be discussed.

2. From Black Hole Scattering to Gravitational Waveforms

Gustav Mogull

09/09/2025, 13:30

In this talk I will outline a full workflow from classical black hole scattering to producing gravitational waveforms in bound binary systems. This will include our recent computation of 5PM-1SF scattering observables using the Worldline Quantum Field Theory (WQFT) formalism, Effective-One-Body (EOB) resummation and comparisons with NR data both for scattering and bound orbits.

6. Discussion

Maarten van de Meent

09/09/2025, 15:10

19. Quantum spectral method

Ofri Telem (The Hebrew University of Jerusalem)

09/09/2025, 16:10

7. Numerical approaches to self-force calculations along scatter orbits

Chris Whittall

10/09/2025, 09:30

In this talk we will review the methods used to perform numerical calculations of the self-force along scatter geodesics in black hole spacetimes. Starting with a general introduction to the calculation of the self-force by mode-sum regularisation, we will move on to discuss two extant numerical platforms for calculating the scalar-field self-force along scatter geodesics, one of which solves...

8. Applications of numerical self-force scattering simulations

Oliver Long

10/09/2025, 10:00

Following the discussion of how to calculate the self-force on scattering orbits, I will discuss the applications of the results of these simulations. This starts with results from scalar self-force scattering, including radiated and absorbed fluxes, a resummation of post-Minkowskian that improves the faithfulness to the numerical results across the whole parameter space, and the use of scalar...

9. Updates on Black Hole Scattering from Self Force

Davide Usseglio

10/09/2025, 11:10

In this talk I will discuss the general strategy employed for solving analytically the Teukolsky equation where the perturbation is sourced by a particle in a hyperbolic orbit. This method relies on a combination of post-Newtonian (PN) and post-Minkowskian (PM) expansion in order to extract analytical information and it has been used for studying the scattering of a scalar charge around a...

10. Extracting spinning two-body observables from S-matrix

Canxin Shi

10/09/2025, 13:30

I will present a novel method for extracting observables for two-body scattering systems from a set of generating functions, with full spin dependence. The approach uses the classical limit of the logarithm of the quantum S-matrix as generating functions. The 4-point matrix element of Log(S) gives the radial action, corresponding to conservative effects, whereas the higher-point contributions...

11. Discussion

Leor Barack

10/09/2025, 15:10

12. Methods for computing observables in classical gravity

Pierre Vanhove

11/09/2025, 09:30

In this talk we will present various methods that have been developed recently for computing observables in classical gravity.

13. Self-force and Loops in Black Hole Scattering

Gustav Jakobsen

11/09/2025, 11:10

I present recent progress on the classical loop (post-Minkowskian)
expansion of black-hole scattering and its relation to the self-force
expansion. I will focus on how these expansions are organized within
worldline quantum field theory and its diagrammatic framework. This
includes our novel four-loop results, higher-spin observables, and open
puzzles that point to future work.

14. Solving the Einstein equations by quantum field theory methods

Poul Damgaard

11/09/2025, 13:30

Inspired by the perturbiner method of quantum field theory I describe how to rephrase the perturbative solution of the Einstein equations in terms of an iterative scheme. As an application, I outline how to compute the metric outside a localized region of stationary matter to arbitrarily high order in the coupling G.

15. Discussion

Mao Zeng

11/09/2025, 15:10

16. Perturbative Computations from Curved Spacetimes

Nabha Shah

12/09/2025, 09:30

Given the impressive results for classical observables obtained by field theoretic approaches to gravitational systems, we can ask if these tools can help us in new regimes and problems of interest. Amplitude tools are particularly well suited to derive observables for the binary system in a post-Minkowskian expansion, where they have achieved complete results to fourth order in Newton's...

17. Love Numbers and Self Force from Effective Field Theory

Dimitrios Kosmopoulos

12/09/2025, 11:10

I will introduce a new formalism that combines techniques from Effective Field Theory (EFT) with solutions to Black Hole Perturbation Theory. I will present new results obtained with this formalism for dynamical EFT Love numbers and discuss prospects for the computation of Self-Force observables.

18. Discussion

Julio Parra-Martinez

12/09/2025, 12:10

5. Invited talk

Ira Rothstein