Filter
iCal export
I have read and understood the above.
I have read and understood the above.
Download current event:
Event calendar file
In order to enable an iCal export link, your account needs to have a key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
In conjunction with a having a key associated with your account, to have the possibility of exporting private event information necessitates the creation of a persistent key. This new key is also associated with your account and whilst it is active the data which can be obtained through using this key can be obtained by anyone in possession of the link provided. Due to this reason, it is extremely important that you keep links generated with this key private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately remove it from 'My Profile' under the 'HTTP API' tab and generate a new key before regenerating iCalendar links.
Permanent link for public information only:
Permanent link for all public and protected information:
Please use CTRL + C to copy this URL
Detailed timetable
More
Amplitudes 2017 Summer School
from
to
(UTC)
at Appleton Tower ( Lecture Theatre 2 )
at Appleton Tower ( Lecture Theatre 2 )
11 Crichton Street, Edinburgh, EH8 9LE, UK
Description 
The study of scattering amplitudes has developped substantially over the past few years, with applications ranging from precision calculations for the LHC through new approaches to gauge theories and gravity and ending with pure mathematics. The annual meeting Amplitudes 2017 workshop will be hosted by the Higgs Centre between 1014 July. This present summer school is held in the week preceding the workshop, and it offers an introduction to some of the central topics to be discussed at the workshop. Five lecturers will deliver sets of lectures and tutorials over the full 5 days of 37 July. 
Go to day


10:15
 10:45
Registration
30'

10:50
 11:00
Welcome
10'

11:00
 11:50
1001 tales of gluons  lecture 1
50'
Speaker: Stefan Weinzierl (University of Mainz) Material: Video 
12:00
 12:50
Multiloop Scattering Amplitudes and Cluster Algebras  lecture 1
50'
Speaker: Marcus Spradlin (Brown University) Material: Video  13:00  14:30 Lunch Break

14:30
 15:20
1001 tales of gluons  lecture 2
50'
Speaker: Stefan Weinzierl (University of Mainz) Material: Video  15:30  16:00 Coffee break

16:00
 16:50
Multiloop Scattering Amplitudes and Cluster Algebras  lecture 2
50'
Speaker: Marcus Spradlin (Brown University) Material: Video  17:00  17:20 Coffee break

17:20
 17:45
Azurite: finding master Integrals using algebraic geometry
25'
For any given Feynman graph, the set of integrals with all possible powers of the propagators spans a vector space of finite dimension. I will introduce the package Azurite (arXiv:1612.04252) which efficiently finds a basis of this vector space. It constructs the needed integrationbyparts (IBP) identities on a set of generalized unitarity cuts. It is based on syzygy computations and analyses of the symmetries of the involved Feynman diagrams and is powered by the computer algebra systems Singular and Mathematica. I will also discuss some recent progresses and application of Azurite.
Speaker: Alessandro Georgoudis (Uppsala University) Material: Mathematica Notebook Slides Video 
17:50
 18:15
Amplitudes and Correlator Integrands to Ten Loops Using Graphical Bootstraps
25'
We introduce the "triangle" and "pentagon" rules for obtaining contributing coefficients to the fourpoint correlation function and scattering amplitude integrands in planar, maximally supersymmetric YangMills theory. Combining these graphical rules with the rung rule prove powerful enough to fully determine both functions through ten loops. We illustrate their applications, compare their relative strengths for fixing coefficients, and if time permits, survey some of the novel features of the higherloop expressions.
Speaker: VuongViet Tran (Durham University) Material: Slides Video  18:20  19:30 Welcome reception

10:15
 10:45
Registration
30'


09:30
 10:20
1001 tales of gluons  lecture 3
50'
Speaker: Stefan Weinzierl (University of Mainz) Material: Video  10:30  11:00 Coffee break

11:00
 11:50
1001 tales of gluons  tutorial
50'
Material: Video 
12:00
 12:50
Multiloop Scattering Amplitudes and Cluster Algebras  lecture 3
50'
Speaker: Marcus Spradlin (Brown University) Material: Video  13:00  14:30 Lunch break

14:30
 15:20
1001 tales of gluons  lecture 4
50'
Speaker: Stefan Weinzierl (University of Mainz) Material: Video  15:30  16:00 Coffee break

16:00
 16:50
Multiloop Scattering Amplitudes and Cluster Algebras  lecture 4
50'
Speaker: Marcus Spradlin (Brown University) Material: Video  17:00  17:20 Coffee break

17:20
 17:45
Maximal Cuts in Arbitrary Dimension
25'
After recalling the basics of generalized unitarity and maximal cuts, I will discuss recent work with Mads S{\o}gaard and Yang Zhang (1704.04255): We discuss a procedure for computing maximal cuts in general D dimensions, based on the Baikov representation which simplifies the structure of the cuts. In our procedure, for a given topology, the integration splits into several regions and the number of independent regions is equal to the number of master integrals for the topology. The functions thus obtained inherit IBP and dimension shift identities from the uncut integral. Moreover, the functions, corresponding to the master integrals, obtained from the different regions, form the Wronskian matrix for the system of differential equations on the maximal cut. The discussion will be guided by an explicit example (probably the massless double box, but this remains to be decided).
Speaker: Jorrit Bosma (ETH, Zurich) Material: Slides Video 
17:50
 18:15
Combinatorics and Topology of Kawai–Lewellen–Tye Relations
25'
We study surprising connections between algebraic topology and string theory amplitudes which underlie Kawai–Lewellen–Tye (KLT) relations. For instance, we show that entries of the inverse KLT kernel can be understood as intersection numbers of certain cycles. In the fieldtheory limit, combinatorics of these intersections gives rise to the biadjoint scalar theory.
Speaker: Sebastian Mizera (Perimeter Institute for Theoretical Physics) Material: Slides Video

09:30
 10:20
1001 tales of gluons  lecture 3
50'


09:30
 10:20
Graphical Methods for Sharp Prediction: from theories entirely formal to the utterly effective  lecture 1
50'
Speaker: John Joseph Carrasco (CEA, Saclay) Material: Lectures Slides Video  10:30  11:00 Coffee break

11:00
 11:50
Graphical Methods for Sharp Prediction: from theories entirely formal to the utterly effective  lecture 2
50'
Speaker: John Joseph Carrasco (CEA, Saclay) Material: Video 
12:00
 12:50
Grassmannian Geometry of Scattering Amplitudes  lecture 1
50'
Speaker: Jaroslav Trnka (University of California, Davis) Material: Video  13:00  14:30 Lunch break

14:30
 15:20
Grassmannian Geometry of Scattering Amplitudes  lecture 2
50'
Speaker: Jarosalav Trnka (University of California, Davis) Material: Video  15:30  16:00 Coffee break

16:00
 16:50
Feynman Integrals  lecture 1
50'
Speaker: Johannes Henn (Mainz University)  17:00  17:20 Coffee break

17:20
 17:45
TwoLoop Fundamental ColourKinematics Duality
25'
The study of looplevel scattering amplitudes in (super)YangMills theories has seen enormous progress over the last decade or so. Unfortunately, many of these developments are limited to the planar limit which consists of only planar Feynman diagrams. Meanwhile, looplevel (super)gravity amplitudes are difficult to calculate with ordinary Feynman diagrams. In this talk I will introduce Bern, Carrasco & Johansson’s (BCJ’s) colourkinematics duality. The duality recycles planar treelevel amplitudes into fullcolour loop level amplitudes, while also giving looplevel gravity amplitudes by a double copy. I will also discuss the inclusion of fundamental matter multiplets, and apply these techniques to N=2 supersymmetry with extra hypermultiplets at two loops.
Speaker: Gustav Mogull (University of Edinburgh) Material: Slides Video 
17:50
 18:15
Unifying Relations for Scattering Amplitudes
25'
The talk is based on 1612.00868 and work to appear with Clifford Cheung and Congkao Wen. We derive new scattering amplitudes relations which reveal a hidden unity among theories of diverse spins in general spacetime dimensions. These relations are built from a set of Lorentz invariant differential operators which transmute states of higher spin into states of lower spin. Transmutation takes amplitudes of gravity coupled to a dilaton and twoform into any amplitude in Einstein YangMills, the special Galileon, and (Dirac)Bornfield theory. Starting from YangMills amplitudes, the transmutation covers any amplitude in gauged biadjoint scalar theory and the nonlinear sigma model. As a corollary, known properties of gauge theory and gravity amplitudes like the Weinberg soft theorems, colorkinematics duality, the KLT relations, and the CHY construction are trivially inherited by the transmuted amplitudes. In the case of the nonlinear sigma model, the recently found kinematic algebra becomes obvious from this construction.
Speaker: ChiaHsien Shen (Caltech) Material: Slides Video

09:30
 10:20
Graphical Methods for Sharp Prediction: from theories entirely formal to the utterly effective  lecture 1
50'


09:30
 10:20
Feynman Integrals  lecture 2
50'
Speaker: Johannes Henn (Mainz University)  10:30  11:00 Coffee break

11:00
 11:50
Feynman Intergrals  tutorial
50'
Speaker: Johannes Henn (Mainz University) 
12:00
 12:50
Graphical Methods for Sharp Prediction: from theories entirely formal to the utterly effective  lecture 3
50'
Speaker: John Joseph Carrasco (CEA, Saclay) Material: Video  13:00  14:30 Lunch break

14:30
 15:20
Grassmannian Geometry of Scattering Amplitudes  lecture 3
50'
Speaker: Jaroslav Trnka (University of California, Davis) Material: Video  15:30  16:00 Coffee break

16:00
 16:50
Feynman Integrals  lecture 3
50'
Speaker: Johannes Henn (Mainz University)  17:00  17:20 Coffee break

17:20
 17:45
Determining the Soft Anomalous Dimension from General Constraints
25'
Bootstrapping techniqueswherein one imposes known constraints on an ansatz in the hope of uniquely determining the answerhave proven to be an increasingly powerful method for computing amplitudes in recent years. While the most significant progress in this direction has been made in planar maximally supersymmetric Yang Mills theory, these techniques can be naturally extended to the types of quantities directly relevant to collider computations. One place these methods show particular promise is in the resummation of large logarithms, and we here report the successful bootstrap of the (correction to the allorder dipole contribution) of the massless soft anomalous dimension at three loops, up to an overall numerical factor.
Speaker: Andrew McLeod (SLAC, Stanford University) Material: Slides Video 
17:50
 18:15
Exploring Reggeon bound states in strongly coupled N=4 super Yang Mills theory
25'
I will discuss scattering amplitudes in strongly coupled N=4 super YangMills theory in the multiRegge limit. In the strong coupling regime, the calculation of the scattering amplitudes reduces to the solution of a system of nonlinear, coupled integral equations through the AdS/CFTcorrespondence. These equations reduce to standard Bethe ansatz equations in the multiRegge limit. In this kinematical regime, scattering amplitudes in N=4 SYM are physically described by bound states of effective particles, the socalled Reggeons. The six point remainder function is fully described by a twoReggeon bound state and is known at finite coupling. At eight external gluons a threeReggeon bound state starts to appear about which much less is known. We investigate the threeReggeon bound state in the strong coupling regime and try to make some generalisations to multipleReggeon bound states.
Speaker: Theresa Abl (ETH, Zurich) Material: Slides Video 
19:15
 22:30
Dinner
(
Royal Scots Club
)
arrive 19.1519.30

09:30
 10:20
Feynman Integrals  lecture 2
50'


09:30
 10:20
Grassmannian Geometry of Scattering Amplitudes  lecture 4
50'
Speaker: Jaroslav Trnka (University of California, Davis) Material: Video  10:30  11:00 Coffee break

11:00
 11:50
Grassmannian Geometry of Scattering Amplitudes  tutorial
50'
Speaker: Jaroslav Trnka (University of California, Davis) Material: Video 
12:00
 12:50
Graphical Methods for Sharp Prediction: from theories entirely formal to the utterly effective  lecture 4
50'
Speaker: John Joseph Carrasco (Institute for Theoretical Physics (IPhT), CEASaclay and University of ParisSaclay) Material: Video  13:00  14:30 Lunch break

14:30
 15:20
Feynman Integrals  lecture 4
50'
Speaker: Johannes Henn (Mainz University)  15:30  16:00 Coffee break

16:00
 16:50
Feynman Integrals  lecture 5
50'
Speaker: Johannes Henn (Mainz University)  17:00  17:20 Coffee break

17:20
 17:45
Onshell diagrams and Ambitwistor strings in N=8 supergravity
25'
I will discuss how onshell diagrams for N=4 Super Yang Mills can be extended to N=8 Supergravity, giving Grassmannian integral formulae for treelevel amplitudes. I will then describe the connection between these formulae and equivalent expressions for the same amplitudes arising from ambitwistor string theory.
Speaker: Joe Farrow (Durham University) Material: Video 
17:50
 18:15
From BCJ double copy to inflationary cosmology
25'
The BCJ double copy relates the scattering amplitudes from gauge and gravity theories. One such theory corresponds to a model first developed by Volkov and Akulov to describe Goldstone fermions (associated with spontaneous supersymmetry breaking). It was later realized that the VolkovAkulov model is equivalent to the same constrained (nilpotent) superfields appearing in the cosmological models known as alphaattractors. In this talk I'll explore some possible applications of the double copy procedure to inflationary cosmology.
Speaker: Andres LunaGodoy (University of Glasgow) Material: Slides Video

09:30
 10:20
Grassmannian Geometry of Scattering Amplitudes  lecture 4
50'