University COVID-19 update

The University of Waterloo is constantly updating our most Frequently Asked Questions.

Questions about buildings and services? Visit the list of Modified Services.

Please note: The University of Waterloo is closed for all events until further notice.

Events by date

Thursday, August 6, 2020

Thursday, August 6, 2020 — 2:30 PM EDT

Title: Subdivergence-free gluings of trees

Speaker: Jordan Long Affiliation: University of Waterloo Zoom: Contact Karen Yeats

Abstract:

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.

Thursday, August 6, 2020 — 2:30 PM EDT

Title: Counting the $c_2$ invariant on the circulant family of graphs

Speaker: Mushegh Shahinyan Affiliation: University of Waterloo Zoom: Contact Karen Yeats

Abstract:

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.

Thursday, August 6, 2020 — 2:30 PM EDT

Title: Abelian covering graphs and their properties

Speaker: Olha Silina Affiliation: University of Waterloo Zoom: Contact Karen Yeats

Abstract:

 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.

S M T W T F S
26
27
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
  1. 2020 (92)
    1. November (1)
    2. October (1)
    3. September (12)
    4. August (11)
    5. July (17)
    6. June (11)
    7. May (6)
    8. March (11)
    9. February (11)
    10. January (11)
  2. 2019 (167)
    1. December (5)
    2. November (15)
    3. October (18)
    4. September (15)
    5. August (9)
    6. July (17)
    7. June (18)
    8. May (16)
    9. April (9)
    10. March (24)
    11. February (13)
    12. January (8)
  3. 2018 (138)
  4. 2017 (103)
  5. 2016 (137)
  6. 2015 (136)
  7. 2014 (88)
  8. 2013 (48)
  9. 2012 (39)
  10. 2011 (36)
  11. 2010 (40)
  12. 2009 (40)
  13. 2008 (39)
  14. 2007 (15)