Triangle Seminars
Wednesday, 1 Mar 2017
Modular properties of String Scattering Amplitudes
Michael Green
(DAMTP/QMUL)
Abstract:
This talk will focus on some recent results concerning the low energy expansion of superstring scattering amplitudes. Whereas tree-level amplitudes generate a series of multiple zeta values (MZV) the genus-one amplitudes generate a series of elliptic generalisations (“modular graph functionsâ€) that satisfy fascinating polynomial relations analogous to those satisfied by MZV’s.
The latter part of the talk will briefly review how these features fit in with the non-perturbative structure of superstring amplitudes, studied some time ago.
This talk will focus on some recent results concerning the low energy expansion of superstring scattering amplitudes. Whereas tree-level amplitudes generate a series of multiple zeta values (MZV) the genus-one amplitudes generate a series of elliptic generalisations (“modular graph functionsâ€) that satisfy fascinating polynomial relations analogous to those satisfied by MZV’s.
The latter part of the talk will briefly review how these features fit in with the non-perturbative structure of superstring amplitudes, studied some time ago.
Posted by: QMW
Yangian Symmetry and Integrability of Planar N=4 SYM
Niklas Beisert
(ETH Zurich)
Abstract:
This talk is about integrability of Planar N=4 super Yang-Mills theory. We present a concrete notion of the corresponding Yangian symmetry in this model, show that it holds true, and discuss the (perturbative) implications for correlation functions and Wilson loops.
This talk is about integrability of Planar N=4 super Yang-Mills theory. We present a concrete notion of the corresponding Yangian symmetry in this model, show that it holds true, and discuss the (perturbative) implications for correlation functions and Wilson loops.
Posted by: QMW
Thursday, 2 Mar 2017
Quantum Geometry and Non-Geometric Backgrounds
Richard Szabo
(Heriot Watt)
Abstract:
Recent advances in non-geometric string theory suggest that locally
non-geometric flux compactifications can be understood in terms of
nonassociative deformations of spacetime geometry. We will review some of
these developments and how they shed light on properties of non-geometric strings, and explain some new results concerning how these structures lift to non-geometric M-theory
Recent advances in non-geometric string theory suggest that locally
non-geometric flux compactifications can be understood in terms of
nonassociative deformations of spacetime geometry. We will review some of
these developments and how they shed light on properties of non-geometric strings, and explain some new results concerning how these structures lift to non-geometric M-theory
Posted by: QMW