Please email any errors or updates to our website support/editor.
PDF files require Adobe Acrobat Reader.
Visit our COVID-19 information website to learn how Warriors protect Warriors.
Please note: The University of Waterloo is closed for all events until further notice.
Title: Subdivergence-free gluings of trees
Speaker: Jordan Long Affiliation: University of Waterloo Zoom: Contact Karen YeatsAbstract:
Motivated by questions in quantum field theory, we introduce a purely combinatorial problem of counting subdivergence-free gluings of trees. We present closed-form expressions counting subdivergence-free gluings for four different families of trees, as well as an algorithm to count subdivergence-free gluings of arbitrary pairs of trees. This is joint work with Clair Dai and Karen Yeats.
Title: Counting the $c_2$ invariant on the circulant family of graphs
Speaker: Mushegh Shahinyan Affiliation: University of Waterloo Zoom: Contact Karen YeatsAbstract:
The algebro-geometric invariant on Feynman Diagrams called the $c_2$ invariant is a useful tool for detecting properties of Feynman periods. We present this identity on graphs that originate from the scalar $\phi_4$-theory with a purely combinatorial perspective and go over some strategies for computing it. We will further narrow our focus onto the circulant family of graphs and present some explicit results.
Title: Abelian covering graphs and their properties
Speaker: Olha Silina Affiliation: University of Waterloo Zoom: Contact Karen YeatsAbstract:
A covering graph is a structure obtained from a graph by ‘replacing’ every vertex with a coclique of size $r$. The main focus of this talk is connections between (spectral) characteristic of a cover and properties such as being walk- or distance- regular.
Please email any errors or updates to our website support/editor.
PDF files require Adobe Acrobat Reader.
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.