Ambitwistor Strings, Loop Amplitudes, and Strings

• Piotr Tourkine (Cambridge)

Room: Albanova FB52

Nordita Seminar: Modern Approaches to Quantum Scattering Amplitudes

• Radu Roiban (Penn State)

Room: Albanova FB53 Quantum scattering amplitudes, classically given by the famous pictorial representation of Richard Feynman which describe the many ways the collisions between particles could take place in space-time, are a cornerstone of today's quantum field theory. In the past decade, we have learned a great deal about scattering amplitudes for completely general theories. Central to these developments has been the N = 4 Super- Yang-Mills theory. The quest to more loops, more legs and less symmetry led to completely different ways of visualizing and computing scattering amplitudes, some of which reach beyond the standard framework of flat space relativistic quantum field theory and place quantum scattering amplitudes at the intersection several fields of physics (and mathematics). We shall highlight some of the surprising advances and illustrate them with examples from N=8 supergravity and N = 4 super-Yang-Mills theory, discuss applications to particle physics experiments, two-dimensional integrable models and other observables in quantum field theories.

String Amplitudes in the High and Low Energy Limits

• Rodolfo Russo (Queen Mary)

Room: Albanova FB52 Perturbative string amplitudes encode information that is relevant in many different contexts, from determining the effective action to studying the high energy behaviour of the theory. I will discuss how to isolate from the full string amplitudes the leading and subleading contributions to these different limits by focusing in particular on some concrete, interesting examples.

Multiloop Amplitudes with the Non-Minimal Pure Spinor Formalism

• Carlos Mafra (IAS Princeton & Southampton)

Room: Albanova FB53

Introduction to Color-kinematics Duality and the Double Copy

• John Joseph Carrasco (IPhT/CEA Saclay & IAS Princeton)

Room: Albanova FB54

Classical Squaring Relations Between Gauge Theory and Gravity

• Donal O'Connell (Edinburgh)

Room: Albanova FB53

Introduction to Ambitwistor Strings I

• David Skinner (Cambridge)

Room: Albanova FB52

Introduction to Ambitwistor Strings II

• Lionel Mason (Oxford)

Room: Albanova FB52

Berends-Giele Currents in String Amplitudes

• Oliver Schlotterer (AEI Potsdam)

Room: Albanova FB53

Scattering Equations and Analytic Gluon Amplitudes

• Emil Bjerrum-Bohr (NBIA Copenhagen)

Room: Albanova FB52

From Maximal to Minimal Supersymmetry in String Loop Amplitudes

• Marcus Berg (Karlstad)

Room: Albanova FB52

Yangian Symmetry of Planar N = 4 SYM

• Niklas Beisert (ETH Zurich)

Room: Albanova FB53

Scattering via Riemann Spheres

• Song He (Institute of Theoretical Physics, CAS, Beijing)

Room: Albanova FB53

N=2 theories: duality, instantons and all that

• Alberto Lerda (Università del Piemonte Orientale, and INFN)

Room: Albanova FB53

The Three-Loop Cusp Anomalous Dimension in QCD and in N=4 SYM

• Gregory Korchemsky (IPhT/CEA Saclay)

Room: Albanova FB53

Symmetries and Soft Theorems in String and Field Theories

• Raffaele Marotta (INFN Napoli)

Room: Albanova FB53

Lessons from Perturbative Unitarity of String Theory Amplitudes

• Yu-tin Huang (National Taiwan University)

Room: Albanova FB53

BCFW Recursion and Boundary Contributions

• Bo Feng (Zhejiang U.)

Room: Albanova FB53

Remainder Functions and Operators in N=4 SYM

• Gabriele Travaglini (Queen Mary)

Room: Albanova FB53

Six-Point Remainder Function in Multi-Regge-Kinematics

• Johannes Broedel (Humboldt)

Room: Albanova FB53

Numerical Unitarity Method for Two-Loop Amplitudes in QCD

• Harald Ita (Freiburg)

Room: Albanova FB53

Integration-by-Parts Reductions from Unitarity Cuts and Algebraic Geometry

• Kasper Larsen (ETH Zurich)

Room: Albanova FB53

Local Integrands for Two-Loop All-Plus Yang-Mills Amplitudes

• Simon Badger (Edinburgh)

Room: Albanova FB53

Precision Theory for the LHC

• David Kosower (IPhT/CEA Saclay)

Room: Albanova FB53

Landau Singularities and Symbology

• Anastasia Volovich (Brown)

Room: Albanova FB53

The Many Uses of Form Factors

• Andreas Brandhuber (Queen Mary)

Room: Albanova FB53

Amplitudes and logs in Chiral Perturbation Theory

• Johan Bijnens (Lund U.)

Room: Albanova FB53

The Four-Loop Cusp Anomalous Dimension in QCD

• Johannes Henn (JGU Mainz)

Room: Albanova FB53

Diagrammatic Hopf Algebra of Cut Feynman Integrals: the One-Loop Case

• Samuel Abreu (Freiburg)

Room: Albanova FB53

Collinear Corrections to Next-to-Soft Theorems

• Lorenzo Magnea (Torino)

Room: Albanova FB53