Name: Amplifying Gravity at All Scales
Start: 2023-06-26T09:00:00+02:00
End: 2023-07-21T18:00:00+02:00
Location: Albano Building 3

Monday, 26 June 2023

09:00 Registration
Registration
09:00 - 10:00
Room: Nordita, 6th floor

10:00 Welcome -- 1st week
Welcome -- 1st week
10:00 - 10:30
Room: Albano 3: 4204 - SU Conference Room (56 seats)
10:30 Classical Double Copy: Solutions, Scattering, and Horizons - Cynthia Keeler (Arizona State University)
Classical Double Copy: Solutions, Scattering, and Horizons
- Cynthia Keeler (Arizona State University)
10:30 - 11:30
Room: Albano 3: 4204 - SU Conference Room (56 seats) We will review the classical double copy, beginning with the map between exact solutions. We will cover both the Kerr-Schild and Weyl formulations. Following a survey of known exact solutions, we will review why a position-space classical solution double copy is even feasible. We will briefly discuss some perturbative approaches, and then close by relating several gravitational objects (including horizons) to their gauge theory analogues.
18:30 Reception
Reception
18:30 - 21:00
Tuesday, 27 June 2023
10:30 EFT S-matrix boostrap - Yu-tin Huang (NTU Taiwan)
EFT S-matrix boostrap
- Yu-tin Huang (NTU Taiwan)
10:30 - 11:30
Room: Albano 3: 4204 - SU Conference Room (56 seats) I will review the recent revival of S-matrix bootstrap in the context of massless EFTs. We will begin with the EFT of massless scalars, spinning and colored states and identify the data which we can hope to constrain. We will lay out the constraints of unitarity and locality in the UV and how it can be utilized to bound the low energy couplings through dispersion relations. We will focus in particular on gravitation systems, where the presence of massless poles requires a modern update to the bootstrap methods are required.
11:45 Color-Dual Constraints on Gravitational EFT - Nic Pavao
Color-Dual Constraints on Gravitational EFT
- Nic Pavao
11:45 - 12:15
Room: Albano 3: 4204 - SU Conference Room (56 seats) I will discuss the recent developments regarding how color-kinematics duality places surprisingly rigid constraints on gravitational EFTs constructed from the double copy. We will begin with a review of color-kinematics and highlight the graphical simplicity that underlies the double-copy construction. This background will pave the way for our main finding: the realization that color-dual structure with factorization is sufficient to induce an infinite tower of constraints on higher derivative four-point operators. Remarkably, these color-dual towers can be resummed, unveiling concealed particle residues, which are consistent with known UV completions of gravity.
Wednesday, 28 June 2023
10:30 An introduction to flat space holography - Romain Ruzziconi (Vienna University of Technology)
An introduction to flat space holography
- Romain Ruzziconi (Vienna University of Technology)
10:30 - 11:30
Room: Albano 3: 4204 - SU Conference Room (56 seats) I will review some aspects of gravity in asymptotically flat spacetime and mention important challenges to obtain a holographic description in this framework. I will then present two important approaches towards flat space holography, namely Carrollian and celestial holography, and briefly explain how they are related to each other. Similarities and difference between flat and anti-de Sitter spacetimes will be emphasized throughout the talk.
11:45 Celestial Soft Algebras - Walker Melton
Celestial Soft Algebras
- Walker Melton
11:45 - 12:15
Room: Albano 3: 4204 - SU Conference Room (56 seats) Gauge and gravity amplitudes have near-universal behavior in the limit where gravitons or gluons have low energies. In celestial CFT, these universal soft algebras imply the existence of higher-spin current algebras. After discussing the origins of these celestial soft algebras from collinear limits of successive soft insertions, I will describe how gauge soft algebra of Yang-Mills is extended when coupled to neutral complex scalars. Central extensions of the soft algebra for Yang-Mills are generated by expanding around sourced scalar backgrounds.
Thursday, 29 June 2023
10:30 Scattering amplitudes methods for gravitational waves - Andres Luna (NBI Copenhagen)
Scattering amplitudes methods for gravitational waves
- Andres Luna (NBI Copenhagen)
10:30 - 11:30
Room: Albano 3: 4204 - SU Conference Room (56 seats) I will review recent developments in techniques for the computation of scattering amplitudes in quantum field theory, and their application to the modelling of black-hole binaries and their waveforms. I will show the computation of a two body Hamiltonian, and a scattering angle in the second post-Minkowskian approximation. Through this relatively simple example we will illustrate the use of spinor helicity, amplitudes bootstrap, double copy and unitarity, as well as diverse techniques to translate (the classical limit of) amplitudes into observables.
11:45 On Massive Higher Spins and their Interactions - Lukas Lindwasser
On Massive Higher Spins and their Interactions
- Lukas Lindwasser
11:45 - 12:15
Room: Albano 3: 4204 - SU Conference Room (56 seats) There are several problems with modelling massive particles with spin higher than 1 coupled to electromagnetism or gravity. In this talk I will briefly outline these problems, and then show how gauge symmetry can solve some of them. I will also demonstrate that not every choice of gauge symmetry used in the formulation of massive higher spins is sufficient for this purpose.
18:30 Dinner downtown
Dinner downtown
18:30 - 21:00
Friday, 30 June 2023
10:30 Observables in expanding universes - Paolo Benincasa (MPI Munich)
Observables in expanding universes
- Paolo Benincasa (MPI Munich)
10:30 - 11:30
Room: Albano 3: 4204 - SU Conference Room (56 seats) The physics occurring in an expanding universe is encoded in correlation functions at his boundary. Part of its structure is inherited from the probability distributions of the field configuration at such boundary, or equivalently in the so-called wavefunction of the universe. I'll review the analytic structure of both the wavefunction and a certain class of correlation functions, their physical content their relation and how to compute the latter from the former. I'll finally discuss a geometrical picture which allows to talk about both quantities at once and to extract physical information that are obscure in the standard field theory language.
Saturday, 1 July 2023
Sunday, 2 July 2023