Seminars of interest to string theorists in Oxford this week
- On Monday 10th March at noon in L5, the String seminar
James Drummond (Trinity College Dublin)
Hexagon functions and six-particle amplitudes in N=4 super Yang-MillsAbstract: We describe the analytic properties of scattering amplitudes in N=4 super Yang-Mills theory, with the focus on high order corrections to the six-particle MHV amplitude. By making an ansatz for the analytic structure and imposing physical constraints, including matching the BFKL expansion in multi-Regge kinematics and the operator product expansion for the dual Wilson loop in the near-collinear regime, we are able to explicitly construct the amplitude to four loops in perturbation theory.
- On Monday 10th March at 2:15 in L5, the Geometry and Analysis seminar
Oscar Garcia-Prada (ICMAT Madrid)
Involutions on Higgs bundle moduli spaces
- On Tuesday 11th March at noon in L5, the Relativity seminar
Congkao Wen (Queen Mary, University of London)
Form factors in N=4 super Yang-Mills
- On Tuesday 11th March at 2:00 in the Seminar Room (Room 501) of DWB, a seminar in the Holography series
Karl Landsteiner (Universidad Autonoma de Madrid)
Quantum Anomalies and Non-Dissipative TransportAbstract: Quantum anomalies belong to the most characteristic properties of of the quantum field theory of relativistc fermions. In the recent years it has become clear that anomalies are responsible for non-dissipative transport phenomena, such as the chiral magnetic and chiral vortical effect. I will review these developments and sketch possible applications in high energy and condensed matter physics.
- On Tuesday 11th March in L4, two seminars in the Algebraic and Symplectic Geometry series
at 2:00, Ben Davison (EPFL Lausanne)
Freeness of critical cohomological Hall algebras, Kac polynomials and character varieties IAbstract: The cohomological Hall algebra of vanishing cycles associated to a quiver with potential is a categorification of the refined DT invariants associated to the same data, and also a very powerful tool for calculating them and proving positivity and integrality conjectures. This becomes especially true if the quiver with potential is "self dual" in a sense to be defined in the talk. After defining and giving a general introduction to the relevant background, I will discuss the main theorem regarding such CoHAs: they are free supercommutative.
at 3:45, Ben Davison (EPFL Lausanne)
Freeness of critical cohomological Hall algebras, Kac polynomials and character varieties IIAbstract: I will discuss some very well studied cohomology groups that turn out to be captured by the machinery of critical CoHAs, for example the compactly supported cohomology of singular quiver varieties and untwisted character varieties. I will explain the usefulness of this extra CoHA structure on these groups, starting with a new proof of the Kac conjecture, and discuss a conjectural form for the CoHA associated to untwisted character varieties that provides a new way to think about the conjectures of Hausel and Rodriguez-Villegas. Finally I will discuss an approach to purity for the compactly supported cohomology of quiver varieties and a related approach to a conjecture of Shiffmann and Vasserot, analogous to Kirwan surjectivity for the stack of commuting matrices.Quantum Anomalies and Non-Dissipative Transport
- On Wednesday 12th March at noon in L5, the string theory bag lunch
Chuang Sun (Oxford)
Introduction to F-theory
- On Thursday 13th March at 1:00 in the Dalitz Institute of DWB, the Particle Phenomenology Forum
Philip Burrows (University of Oxford)
The International Linear Collider: physics and project overview
- On Thursday 13th March at 4:00 in L5, the Number Theory seminar
Mohamed Saidi (Exeter)
Arithmetic of abelian varieties over function fields and an application to anabelian geometryAbstract: We investigate certain (hopefully new) arithmetic aspects of abelian varieties defined over function fields of curves over finitely generated fields. One of the key ingredients in our investigation is a new specialisation theorem a la Néron for the first Galois cohomology group with values in the Tate module, which generalises Néron specialisation theorem for rational points. Also, among other things, we introduce a discrete version of Selmer groups, which are finitely generated abelian groups. We also discuss an application of our investigation to anabelian geometry (joint work with Akio Tamagawa).
- On Thursday 13th March at 4:15 in the Dennis Sciama Lecture Theatre of DWB, the Particle and Fields seminar
Keith Hamilton (University College, London)
Towards event generators for LHC with NNLO accuracy
- On Friday 14th March at 2:00 in the Dennis Sciama Lecture Theatre of DWB, the Theoretical Physics Colloquium
No Colloquium (even week)
- On Friday 14th March at 4:15 in the Martin Wood Lecture Theatre
of the Clarendon Laboratory, the Department of Physics Colloquium
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