REF 2029 have organised a consultation on their Open Access Policy. The open access policy will outline open access requirements for the exercise. There are proposed new requirements for journal outputs and conference proceedings, and new requirements for longform publications. Details on the consultation, and how to get involved.
Wed, 01 May 2024
16:00 -
17:00
L6
ℓ²-Betti numbers of RFRS groups
Sam Fisher
(University of Oxford)
Abstract
RFRS groups were introduced by Ian Agol in connection with virtual fibering of 3-manifolds. Notably, the class of RFRS groups contains all compact special groups, which are groups with particularly nice cocompact actions on cube complexes. In this talk, I will give an introduction to ℓ²-Betti numbers from an algebraic perspective and discuss what group theoretic properties we can conclude from the (non)vanishing of the ℓ²-Betti numbers of a RFRS group.
Neuronal activity induces symmetry breaking in neurodegenerative disease spreading
Alexandersen, C
Goriely, A
Bick, C
Journal of Mathematical Biology
Thu, 02 May 2024
17:00 -
18:00
L4
Cohomogeneity one Ricci solitons and Hamiltonian formalism
Qiu Shi Wang
( Oxford)
Abstract
A Riemannian manifold is said to be of cohomogeneity one if there is a Lie group acting on it by isometries with principal orbits of codimension one. On such manifolds, the Ricci soliton equation simplifies to a system of ODEs, which can be considered as a Hamiltonian system. Various conserved quantities, such as superpotentials, can then be defined to find cases in which the system is explicitly integrable.
There is a considerable body of work, primarily due to A. Dancer and M. Wang, on the analogous procedure for the Einstein equation.
In this talk, I will introduce the abovementioned methods and illustrate with examples their usefulness in finding explicit formulae for Ricci solitons. I will also discuss the classification of superpotentials.
There is a considerable body of work, primarily due to A. Dancer and M. Wang, on the analogous procedure for the Einstein equation.
In this talk, I will introduce the abovementioned methods and illustrate with examples their usefulness in finding explicit formulae for Ricci solitons. I will also discuss the classification of superpotentials.