SAGEX Kickoff Meeting

4 Sept 2018, 08:30 → 7 Sept 2018, 19:00 Europe/London

G. O. Jones Building (Queen Mary University of London)

This is the webpage for the inaugural meeting of the European Commission Innovative Training Network SAGEX, or "Scattering Amplitudes, from Geometry to Experiment". 

The workshop will consist of research presentations from members of the network (Tuesday-Thursday); and meetings with our industrial partners, as well as administrative meetings (supervisory board, task groups) for the beneficiaries, academic and industrial partners (Friday).

Confirmed speakers:

Zvi Bern
Emil Bjerrum-Bohr
Johannes Blümlein
Andi Brandhuber
John Joseph Carrasco
Lance Dixon
Michael Green
Paul Heslop
David Kosower
Lionel Mason
Tristan McLoughlin
Sven-Olaf Moch
Jan Plefka
Carsten Schneider
Volker Schomerus
Matthias Staudacher
 

 

For payment or other administrative queries, please contact Jazmina Vaca Ortiz (j.vaca-ortiz@qmul.ac.uk).

Participants that have not been contacted directly by the organisers are invited to make their own arrangements for accommodation. A convenient option is to stay in College - this can booked at the STAY QM website. 
 

Deadline for registration: July 20, 2018. 

 

Organisers: Lorenzo Bianchi, Andi Brandhuber, Ricardo Monteiro, Gabriele Travaglini, Chris White

Tuesday, 4 September

09:30 Registration

Research Talks: Session 1

1 Welcome (Prof. Bill Spence, Vice Principal for Research, QMUL)

2 Integrability, Scattering Amplitudes, and the Breaking of Yangian Invariance

Speaker: Matthias Staudacher (Humboldt- Universität zu Berlin)

11:00 Coffee

Research Talks: Session 2

3 Iterative non-iterative Integrals in Higher Loop Calculations

Speaker: Johannes Blümlein (DESY Zeuthen)

QMC.pdf

4 Symbolic Summation and Integration Tools for Feynman Integrals

Speaker: Carsten Schneider (RISC (Linz) & RISC GmbH)

SchneiderSagex18.pdf

13:00 Lunch

Research Talks: Session 3

5 Supergravity at Five Loops

Speaker: Zvi Bern (UCLA)

QM_2018.pdf

6 Playful Constructions in Double Copy Predictions (a story about stories)

Speaker: John Joseph Carrasco (CEA Saclay)

16:15 Coffee

Wednesday, 5 September

Research Talks: Session 5

7 Amplitudes on plane wave backgrounds

We set up the study of scattering amplitudes on both gravitational and gauge theory plane wave backgrounds. We do so with a view to exploring the double copy in a semi-nonperturbative framework and to extend the ambi-twistor string formulae to fully curved backgrounds. We give a double copy prescription at three points, and a version of the curved background BCJ relations at four points. We also discuss memory effects and tails of waves.

Speaker: Lionel Mason (University of Oxford)

scatt-plane-wave.pdf

11:00 Coffee

Research Talks: Session 6

8 Classical effective action of dilaton gravity as the double copy of Yang-Mills theory

I will review the computation of the effective gravitational action in the post-Minkowskian and post-Newtonian approximation by „classically“ integrating out the gravitational field in the path integral. It is then shown how this result for dilaton gravity may be easily obtained through a suitable adaption of the BCJ double copy construction applied to the computation of the effective action for two color charged classical particles in Yang-MIlls theory. It is a summary of our recent paper 1807.09859.

Speaker: Jan Plefka (Humboldt-Universität zu Berlin)

ClassicalDoubleCopy.pdf

9 Transcendental Functions and Integrability

Speaker: Volker Schomerus (DESY)

SAGEX_VS.pdf

13:00 Lunch

Research Talks: Session 7

10 N=4 SYM amplitudes and cosmic Galois theory

Scattering amplitudes in planar N=4 super-Yang-Mills theory are dual to light-like polygonal Wilson-loop expectation values. In many cases their perturbative expansion can be expressed in terms of multiple polylogarithms that also obey certain single-valuedness conditions or branch cut restrictions. The rigidity of this function space, together with a few other conditions, allows one to construct the six-point amplitude -- or hexagonal Wilson loop -- through 6 loops. Derivatives of the amplitude can then be used to explore the minimal space of functions expected to contain all such amplitudes, and the structure of the coproduct (or coaction) of its associated Hopf algebra. There is strong evidence that a certain co-action principle is obeyed, which restricts in particular the number of multiple zeta values and alternating sums that can appear.

Speaker: Lance Dixon (SLAC)

DixonSAGEXKickoff_2018_09_05.pdf

11 Correlators in N=4 SYM at weak and strong coupling

I will give an overview of what is known about 4 point correlators of half BPS operators in N=4 SYM both at weak and strong coupling. At weak coupling - in the planar limit - the integrands are known explicitly to 10 loops and give combinations of amplitude integrands at any number of points. It is conjectured that all information needed to extract all n-point l-loop amplitudes is contained in the four-point correlator. These (and higher point) integrands are conjectured to be equivalent to a geometric object the "correlahedron". At strong coupling the correlators are dual via AdS/CFT to graviton amplitudes in IIB string theory on AdS_5 x S^5. We bootstrap these supergravity amplitudes at 1 loop, using recently found tree-level amplitudes, via OPE techniques on the dual CFT side.

Speaker: Paul Heslop (Durham University)

QMUL 2018 full.pdf

16:15 Coffee

Research Talks: Session 8

12 Soft limits and Asymptotic Symmetries

Speaker: Tristan McLoughlin (Trinity College Dublin)

18:00 Wine reception

Thursday, 6 September

Research Talks: Session 9

13 Direct Solutions of IBP Systems

In this talk, I present recent work on solving integration-by-parts (IBP) systems for simplifying Feynman integrals. I'll give a brief review of IBP, and also review the idea of generating vectors which block-diagonalize IBP systems. I then present recent work on conjugate polynomials, which fully diagonalize such systems. I also present an application to generating recurrence relations for arbitrary powers of irreducible numerators in Feynman integrals.

Speaker: David Kosower (CEA Saclay)

Direct Soutions of IBP Systems (SAGEX Kickoff, Sep 6, 2018).pptx

14 QCD splitting functions and cusp anomalous dimensions at four loops

Speaker: Sven Moch (Universität Hamburg)

sagex.pdf

11:00 Coffee

Research Talks: Session 10

15 Gravity Amplitudes and General Relativity

We will discuss the treatment of general relativity as an effective field theory and discuss recent progress for computation. We will use results for amplitudes to derive theoretical predictions in general relativity.

Speaker: Emil Bjerrum-Bohr (NBI Copenhagen)

sagex.pdf

sagex.pptx

16 Form factors from N=4 SYM to Higgs+gluon amplitudes

Speaker: Andreas Brandhuber (Queen Mary University of London)

FF-SAGEX-2018v2.pdf

13:00 Lunch

Colloquium: Professor Michael Green

17 Colloquium: Some features of scattering amplitudes in string theory and quantum field theory (Prof. Michael Green, Cambridge University & QMUL)

This talk will provide an overview of some properties of scattering amplitudes in superstring theory and their connections to amplitudes in conventional quantum field theory. The talk is aimed to be comprehensible to graduate-level physicists, an well as more advanced researchers.

SAGEX.pdf

20:00 Network Dinner (for senior SAGEX members only)

Friday, 7 September

SAGEX Network Meetings: Supervisory Board (including presentations from Private Sector Partners)

18 Ove Scavenius (Danske Bank)

Scavenius.pdf

19 Andrei Petrovskii (DreamQuark)

Petrovskii.pdf

20 Ekaterina Eremenko (EE Films)

21 Erik Postma (Maplesoft)

sagex-maplesoft.pdf

22 Devendra Kapadia (Wolfram Research)

Video Presentation

11:30 Coffee

SAGEX Network Meetings: Supervisory Board (including presentations from EU team)

12:45 Lunch

SAGEX Network Meetings: Supervisor Training and Work Planning

14:45 Coffee

SAGEX Network Meetings: Task Groups