Talks

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Recent Developments in S-matrix theory (ONLINE)
Monday, 20 July 2020
Time Speaker Title Resources
10:50 to 11:00 Rajesh Gopakumar (ICTS, India) Welcome Remarks
11:00 to 13:00 Ashoke Sen (HRI, India ) Soft theorem and its classical limit (Lecture 1)

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15:00 to 17:00 Claude Duhr (CERN, Switzerland) Special functions for Feynman Integrals (Lecture 1)

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18:00 to 20:00 Marcus Spradlin (Brown University, USA) Introduction to Amplitudes (Lecture 1)

1308.1697 and 1708.03872 for the references.
   
Tuesday, 21 July 2020
Time Speaker Title Resources
11:00 to 13:00 Shiraz Minwalla (TIFR, India) Counting and Constraining Gravitational Scattering matrices (Lecture 1)

In these lectures we will systematically parameterize and enumerate local tree level graviton 4 particle S matrices in theories with a finite number of fields. Imposing plausible physical constraints we will demonstrate that the Einstein S matrix is the unique consistent graviton S matrix in $D \leq 6$ dimensions.  
 
15:00 to 17:00 - Cancelled

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18:00 to 20:00 Marcus Spradlin (Brown University, USA) Introduction to Amplitudes (Lecture 2)

1308.1697 and 1708.03872 for the references.
   
Wednesday, 22 July 2020
Time Speaker Title Resources
11:00 to 13:00 Ashoke Sen (HRI, India) Soft theorem and its classical limit (Lecture 2)

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15:00 to 17:00 Claude Duhr (CERN, Switzerland) Special functions for Feynman Integrals (Lecture 2)

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Thursday, 23 July 2020
Time Speaker Title Resources
11:00 to 13:00 Shiraz Minwalla (TIFR, India) Counting and Constraining Gravitational Scattering matrices (Lecture 2)

In these lectures we will systematically parameterize and enumerate local tree level graviton 4 particle S matrices in theories with a finite number of fields. Imposing plausible physical constraints we will demonstrate that the Einstein S matrix is the unique consistent graviton S matrix in $D \leq 6$ dimensions.  
 
14:00 to 20:30 Nima Arkani-Hamed (Institute for Advanced Study, USA) Scattering Amplitudes and Positive Geometries at Infinity (Lecture 1)

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Friday, 24 July 2020
Time Speaker Title Resources
11:00 to 12:30 Chia-Hsien Shen (University of California, USA) Amplitudes Meet LIGO

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14:00 to 19:45 Nima Arkani-Hamed (Institute for Advanced Study, USA) Scattering Amplitudes and Positive Geometries at Infinity (Lecture 2)

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Friday, 24 July 2020 to Saturday, 25 July 2020
Time Speaker Title Resources
20:15 to 01:00 Nima Arkani-Hamed ((Institute for Advanced Study, USA) Scattering Amplitudes and Positive Geometries at Infinity (Lecture 3)
 
Monday, 27 July 2020
Time Speaker Title Resources
11:00 to 13:00 Andrew McLeod (Niels Bohr Institute, Denmark) Planar N = 4 at High Loops and Large Multiplicity

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15:00 to 17:00 Stephan Stieberger (Max-Planck-Institut für Physik, Germany) Celestial Amplitudes and Asymptotic Symmetries (Lecture 1)

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18:00 to 19:30 Prahar Mitra (Institute for Advanced Study, USA) Soft Factorization in Non-Abelian Gauge Theories

Studies of asymptotic symmetries in flat spacetimes has led to several interesting insights into the infrared structure of massless scattering amplitudes. Most of the discussion has been developed in the context of QED or gravity where the soft sector is abelian. In this talk, we will study the generalization of these ideas to non-abelian gauge theories. The non-abelian structure of the theory complicates the discussion and we present some preliminary results here.
 
Tuesday, 28 July 2020
Time Speaker Title Resources
11:00 to 13:00 Sudip Ghosh (OIST, Okinawa, Japan) MHV Graviton Scattering Amplitudes & Current Algebra on the Celestial Sphere

In this talk I will discuss the celestial OPE of gravitons in the MHV sector and how one can organize the OPE in representation of SL(2,C) current algebra and supertranslations. 
   
15:00 to 17:00 Stephan Stieberger (Max-Planck-Institut für Physik, Germany ) Celestial Amplitudes and Asymptotic Symmetries (Lecture 2)

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Wednesday, 29 July 2020
Time Speaker Title Resources
11:00 to 13:00 Sayali Bhatkar (IISERP, India) New asymptotic conservation laws for electromagnetism

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18:00 to 19:30 Jake Bourjaily (Niels Bohr Institute, Denmark) Adventures in Perturbation Theory

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Wednesday, 29 July 2020 to Thursday, 30 July 2020
Time Speaker Title Resources
20:30 to 01:59 Nima Arkani-Hamed (Institute for Advanced Study, USA) Scattering Amplitudes and Clusterhedra in Kinematic Space (Lecture 1)

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Thursday, 30 July 2020
Time Speaker Title Resources
15:00 to 17:00 Shiraz Minwalla (TIFR, India) Constraints on classical Gravitational Scattering amplitudes (Lecture 3)
 
18:00 to 19:30 Sebastian Mizera (Institute for Advanced Study, USA) From Moduli Space Localization to AdS Amplitudes

I will review aspects of localization on the moduli spaces of worldsheets and worldlines, which seems to emerge as a universal property of S-matrices. We will discuss it in three related settings: first in string perturbation theory, then quantum field theory amplitudes in flat space, and finally AdS amplitudes (CFT correlators).
   
Thursday, 30 July 2020 to Friday, 31 July 2020
Time Speaker Title Resources
20:30 to 00:15 Nima Arkani-Hamed (Institute for Advanced Study, USA) Scattering Amplitudes and Clusterhedra in Kinematic Space (Lecture 2)
 
Friday, 31 July 2020
Time Speaker Title Resources
11:00 to 13:00 Ellis Yuan (Zhejiang University, China) Celestial OPE in Scattering Amplitudes

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15:00 to 17:00 Arnab Priya Saha (HRI, India) Double soft theorems in generalized bi-adjoint scalars

In CHY formalism scattering equations map the kinematic space of Mandelstam invariants to the points on CP1. Recently Cachazo, Early, Guevara and Mizera have introduced generalisation to the scattering equations on higher dimensional projective spaces, CPk−1 Bi-adjoint scalar amplitude is a well studied example of this generalisation. We study double soft limits of the generalised bi-adjoint scalar amplitudes. We will present some specific results obtained for k = 3 and show how to generalise them for higher k. This talk is based on the work in progress with Md. Abhishek, Subramanya Hegde and Dileep P. Jatkar.
   
18:00 to 19:30 Alfredo Guevara (PITP, Canada) From Spinning Particles to Classical Gravitational Radiation

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