### Workshop

#### Gravitational scattering, inspiral, and radiation

**Apr 19, 2021 - May 21, 2021**

**Abstract**

The purpose of the workshop is to gather theorists working on apparently different areas which are nevertheless connected to the recent discovery of gravitational waves. More specifically its aims are to: (i) deepen links and foster new collaborations between the quantum gravitational scattering amplitude and the GR community, leading to the calculation of new, high-order, terms in the post-Newtonian and post-Minkowskian perturbative approaches to the physics of binary systems; (ii) identify new synergies between the GR analytical and numerical communities which have already proved to be so crucial in constructing the waveform templates necessary for the analysis of LIGO/Virgo data; (iii) use recent progress on gravitational scattering and radiation in ultra-relativistic collisions of elementary particles or strings to improve the determination of parameters appearing in the effective-one-body approach to the relativistic two-body problem. This includes profiting from a newly-discovered on-shell construction of gravitational amplitudes from gauge-theory amplitudes; (iv) connect properties of the gravitational wave spectrum at low frequencies to recent developments in soft-graviton theorems at sub- and sub-sub-leading level, including predictions for gravitational memory, BMS asymptotic symmetries, and logarithmic enhancements; (v) explore various consequences of modified gravity theories for the LIGO/Virgo discoveries.

**Topics**

Analytic and numerical methods for the general relativistic two-body problem High energy gravitational scattering and radiation

New approaches to gravitational amplitudes

Soft theorems and their use for computing GW signals

Alternative theories of gravity

NOTE ON THE WORKSHOP: We inform all applicants that the workshop will be held remotely.
Detailed instructions about the remote connection will be sent to the registered participants.

**Organizers**

Dimitri Colferai (University of Florence),
Claudia de Rham (Imperial College London),
Alessandro Nagar (INFN, Turin),
Donal O’Connell (University of Edinburgh),
Pierre Vanhove (CEA, Saclay),
Gabriele Veneziano (CERN),
Alexander Zhiboedov (CERN)

**Local organizer**

Dimitri Colferai, Matteo Maria Maglio, Alessio Caddeo

**Contact**

colferai@fi.infn.it

**Related events**

Gravitational scattering, inspiral, and radiation (Training Week) - Apr 19, 2021

Gravitational scattering, inspiral, and radiation (Conference) - Apr 26, 2021

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** SCHEDULE**

**Talks**

Date | Speaker | Title | Type | Useful Links | ||||
---|---|---|---|---|---|---|---|---|

May 04, 2021 - 15:00-16:00 | Prahar Mitra |
Introduction to BMS | Seminar | Video | ||||

May 04, 2021 - 16:30-17:30 | Biswajit Sahoo |
A systematic approach to understand all order soft theorems and tail memories | Seminar | Slides | Video | |||

May 05, 2021 - 14:30-15:30 | Geoffrey Compere |
Angular momentum in GR: the role of generalized BMS symmetry | Seminar | Slides | Video | |||

May 05, 2021 - 16:00-17:00 | Miguel Campiglia |
BMS symmetry at time-infinity | Seminar | Video | ||||

May 06, 2021 - 15:00-16:00 | Keefe Mitman |
Gravitational Memory in Numerical Relativity: Computing Memory Effects, Correcting Waveforms, and the importance of BMS Frames | Seminar | Slides | Video | |||

May 06, 2021 - 16:30-17:30 | Discussion animated by Thibault Damour, Ashoke Sen, Andy Strominger | Discussion | Video | |||||

May 07, 2021 - 15:00-16:00 | Maurizio Firrotta |
String interactions and memory effects | Seminar | Slides | Video | |||

May 10, 2021 - 16:30-17:30 | Agustin Sabio Vera |
The perturbative Regge limit | Seminar | Slides | Video | |||

May 10, 2021 - 17:30-18:30 | Discussion | Discussion | ||||||

May 11, 2021 - 15:00-16:00 | Radu Roiban |
Particle physics methods for higher orders in the PN and PM expansion | Seminar | Video | ||||

May 11, 2021 - 16:00-17:00 | Andreas Maier |
The gravitational potential at fifth post-Newtonian order | Seminar | Slides | Video | |||

May 11, 2021 - 17:00-18:00 | Donato Bini |
Hyperboliclike encounters in a two-body system: Analytical treatment, recent developments and open problems | Seminar | Slides | Video | |||

May 12, 2021 - 15:00-16:00 | Mao Zeng |
Integrals for conservative and radiative binary dynamics | Seminar | Slides | Video | |||

May 12, 2021 - 16:00-17:00 | Carlo Heissenberg |
Loop integrals in the soft region and the gravity eikonal | Seminar | Slides | Video | |||

May 13, 2021 - 15:00-16:00 | Uli Sperhake |
Grazing collisions and eccentric inspirals of black holes | Seminar | Slides | ||||

May 13, 2021 - 16:00-17:00 | Hannes Reuter |
Hyperbolic-like Encounters of Binary Black Holes with the numerical relativity code SpEC | Seminar | Slides | ||||

May 13, 2021 - 17:00-18:00 | Seth Hopper |
Hyperbolic encounters between spinning binary black holes | Seminar | Video | ||||

May 14, 2021 - 15:00-16:00 | Mariana Carrillo Gonzalez |
Conservative Potential from Scattering Amplitudes for Binary Systems with Conformal Coupling to Galileons | Seminar | Slides | Video | |||

May 14, 2021 - 16:00-17:00 | Rafael Aoude |
Scattering amplitudes for Heavy Particle Effective Theories | Seminar | Slides | Video | |||

May 17, 2021 - 15:00-16:00 | Riccardo Gonzo |
Waveforms from the KMOC formalism and coherent states | Seminar | Slides | Video | |||

May 17, 2021 - 16:00-17:00 | Massimiliano Riva |
Gravitational Bremsstrahlung in the Post-Minkowskian Effective Field Theory | Seminar | Slides | Video | |||

May 17, 2021 - 17:00-18:00 | Paolo Di Vecchia (Nordita and Niels Bohr Institute) |
Wave-form from unitarity | Seminar | Slides | Video | |||

May 18, 2021 - 15:00-16:00 | Ludovic Planté |
Classical Gravity from Loop Amplitudes | Seminar | Slides | Video | |||

May 18, 2021 - 16:00-17:00 | Gustav Mogull |
Gravitational Bremsstrahlung from Spinning Bodies using a Worldline QFT | Seminar | Slides | Video | |||

May 18, 2021 - 17:00-17:30 | Enrico Herrmann |
Collider physics tools for dissipative effects in binary dynamics (part I) | Seminar | Slides | Video | |||

May 18, 2021 - 17:30-18:00 | Michael Ruf |
Collider physics tools for dissipative effects in binary dynamics (part II) | Seminar | Video | ||||

May 19, 2021 - 15:00-16:00 | Gregor Kälin |
Post-Minkowskian Framework and the Boundary-To-Bound Dictionary for Gravitational Dynamics | Seminar | Slides | Video | |||

May 19, 2021 - 16:00-16:30 | Chia-Hsien Shen |
Amplitudes, Effective field theory, and Conservative Two-body Dynamics | Seminar | Video | ||||

May 19, 2021 - 16:30-17:00 | Discussion on bound vs unbound problem | Discussion | ||||||

May 20, 2021 - 15:00-16:00 | Alexander Ochirov |
Classical scattering of spinning black holes from quantum amplitudes | Seminar | Slides | Video | |||

May 20, 2021 - 16:00-17:00 | Chia Horng Sheng |
Tidal Deformation and Dissipation of Rotating Black Hole | Seminar | Slides | Video | |||

May 21, 2021 - 15:00-15:45 | Nava Gaddam |
Gravitational scattering at impact parameters L_P << b << R_S and the black hole S-matrix | Seminar | Slides | Video | |||

May 21, 2021 - 15:45-16:30 | Justinas Rumbutis |
Double Copy Relations in Massive Theories | Seminar | Slides | Video | |||

May 21, 2021 - 16:30-18:00 | Inspiralling discussions around the Two-Body Problem | Discussion |