# Next Week

Here is a selection of seminars that might be of interest to string theorists in Oxford:

On Monday at 12:45 in L3, a seminar in
the String Theory series:

Albrecht Klemm (Bonn)

TBA

On Monday at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Matthias Wink (Oxford University)

Constructions of cohomogeneity one Ricci solitons

On Tuesday at 12:00 in L4, a seminar in
the Relativity series:

Dhritiman Nandan (Edinburgh University)

Amplitude relations in Einstein-Yang-Mills theory

**I will discuss recent developments in the study of scattering amplitudes in Einstein-Yang-Mills theory. At tree level we find new structures at higher order collinear limits and novel connections with amplitudes in Yang-Mills theory using the CHY formalism. Finally I will comment on unitarity based observations regarding one-loop amplitudes in the theory. **

**Further information:**
On Tuesday at 15:45 in L4, a seminar in
the Algebraic Geometry series:

Evgeny Shinder (Sheffield)

Specialization of (stable) rationality

*The specialization question for rationality is the following one: assume that very general fibers of a flat proper morphism are rational, does it imply that all fibers are rational? I will talk about recent solution of this question in characteristic zero due to myself and Nicaise, and Kontsevich-Tschinkel. The method relies on a construction of various specialization morphisms for the Grothendieck ring of varieties (stable rationality) and the Burnside ring of varieties (rationality), which in turn rely on the Weak Factorization and Semi-stable Reduction Theorems.*

**Further information:**
On Thursday, November 30, at 12:45 in L2, a seminar in
the Strings Junior series:

Hadleigh Frost

Analytic continuation of path integrals

On Thursday, November 30, at 13:00 in Dalitz Institute, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Hendrik Vogel (SLAC)

TBA

On Thursday, November 30, at 16:00 in L6, a seminar in
the Number Theory series:

Sam Chow (York)

A Galois counting problem

*We count monic quartic polynomials with prescribed Galois group, by box height. Among other things, we obtain the order of magnitude for quartics, and show that non-quartics are dominated by reducibles. Tools include the geometry of numbers, diophantine approximation, the invariant theory of binary forms, and the determinant method. Joint with Rainer Dietmann.*

**Further information:**
On Thursday, November 30, at 16:15 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Ana Achucarro (Universiteit Leiden)

Multifield inflation

On Thursday, November 30, at 17:00 in L3, a seminar in
the String Theory series:

Benjamin Assel (Cern)

RG flows in 3d N=4 gauge theories

*I will present a new approach to study the RG flow in 3d N=4 gauge theories, based on an analysis of the Coulomb branch of vacua. The Coulomb branch is described as a complex algebraic variety and important information about the strongly coupled fixed points of the theory can be extracted from the study of its singularities. I will use this framework to study the fixed points of U(N) and Sp(N) gauge theories with fundamental matter, revealing some surprising scenarios at low amount of matter.*

**Further information:**
On Friday, December 1, at 15:30 in Martin Wood Lecture Theatre, a seminar in
the Colloquia Series Seminars series:

Prof Frederick K. Lamb (University of Illinois)

The Iran Nuclear Deal

On Friday, December 1, at 16:00 in L1, a seminar in
the Math Colloquium series:

Luigi Ambrosio (Scuola Normale Superiore di Pisa)

New developments in the synthetic theory of metric measure spaces with Ricci curvature bounded from below

*The theory of metric measure spaces with Ricci curvature from below is growing very quickly, both in the 'Riemannian' class RCD and the general CD one. I will review some of the most recent results, by illustrating the key identification results and technical tools (at the level of calculus in metric measure spaces) underlying these results.*

**Further information:**