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BEGIN:VEVENT
SUMMARY:Francesca Arici (Universiteit Leiden)
DTSTART:20200514T150000Z
DTEND:20200514T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/1
DESCRIPTION:Title: An introduction to Cuntz--Pimsner algebras\nby Francesca Arici (
Universiteit Leiden) as part of UK Virtual operator algebras seminar\n\n\n
Abstract\nIn 1997 Pimsner described how to construct two universal C*-alge
bras associated with an injective C*-correspondence\, now known as the Toe
plitz--Pimsner and Cuntz--Pimsner algebras. In this talk I will recall the
ir construction\, focusing for simplicity on the case of a finitely genera
ted projective correspondence. I will describe the associated six-term exa
ct sequence in K(K)-theory and explain how these can be used in practice f
or computational purposes. Finally\, I will describe how\, in the case of
a self-Morita equivalence\, these exact sequences can be interpreted as an
operator algebraic version of the classical Gysin sequence for circle bun
dles. \nAssumed Knowledge: Elementary C*-algebra theory.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christopher Schafhauser (University of Nebraska\, Lincoln)
DTSTART:20200514T154500Z
DTEND:20200514T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/2
DESCRIPTION:Title: Approximating traces: what\, why and how\nby Christopher Schafha
user (University of Nebraska\, Lincoln) as part of UK Virtual operator alg
ebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ana Khukhro (University of Cambridge)
DTSTART:20200604T150000Z
DTEND:20200604T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/3
DESCRIPTION:Title: Expanders and generalisations\nby Ana Khukhro (University of Cam
bridge) as part of UK Virtual operator algebras seminar\n\n\nAbstract\nAft
er recalling some motivation for studying highly-connected graphs in the c
ontext of operator algebras and large-scale geometry\, we will introduce t
he notion of "asymptotic expansion" recently defined by Li\, Nowak\, Spaku
la and Zhang. We will explore some applications of this definition\, hopef
ully culminating in joint work with Li\, Vigolo and Zhang.\n\nAssumed Know
ledge: basic operator-algebraic concepts\, some geometric intuition\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hannes Thiel (University of Münster)
DTSTART:20200604T154500Z
DTEND:20200604T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/5
DESCRIPTION:Title: Cuntz semigroups\nby Hannes Thiel (University of Münster) as pa
rt of UK Virtual operator algebras seminar\n\n\nAbstract\nThe Cuntz semigr
oup is a geometric refinement of K-theory that plays an important role in
the structure theory of C*-algebras. It is defined analogously to the Murr
ay-von Neumann semigroup by using equivalence classes of positive elements
instead of projections. \nStarting with the definition of the Cuntz semi
group of a C*-algebra\, we will look at some of its classical applications
. I will then talk about the recent breakthroughs in the structure theory
of Cuntz semigroups and some of the consequences.\n\nAssumed Knowledge: Ba
sic C*-algebra theory\, including comparison theory for projections.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthew Kennedy (University of Waterloo)
DTSTART:20200618T154500Z
DTEND:20200618T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/6
DESCRIPTION:Title: The algebraic structure of C*-algebras associated to groups\nby
Matthew Kennedy (University of Waterloo) as part of UK Virtual operator al
gebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nigel Higson (ennsylvania State University)
DTSTART:20200702T150000Z
DTEND:20200702T160000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/7
DESCRIPTION:Title: John Roe and Coarse Geometry\nby Nigel Higson (ennsylvania State
University) as part of UK Virtual operator algebras seminar\n\n\nAbstract
\nJohn Roe was a much admired figure in topology and noncommutative geomet
ry\, and the creator of the C*-algebraic approach to coarse geometry. Joh
n died in 2018 at the age of 58. My aim in the first part of the lecture w
ill be to explain in very general terms the major themes in John’s work\
, and illustrate them by presenting one of his best-known results\, the pa
rtitioned manifold index theorem. After the break I shall describe a late
r result\, about relative eta invariants\, that has inspired an area of re
search that is still very active.\n\nAssumed Knowledge: First part: basic
familiarity with C*-algebras\, plus a little topology. Second part: basic
familiarity with K-theory for C*-algebras.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ivan Todorov (Queen's University Belfast)
DTSTART:20200618T150000Z
DTEND:20200618T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/8
DESCRIPTION:Title: Non-local games: operator algebraic approaches\nby Ivan Todorov
(Queen's University Belfast) as part of UK Virtual operator algebras semin
ar\n\n\nAbstract\nThe study of non-local games has involved fruitful inter
actions between operator algebra theory and quantum physics\, with a start
ing point the link between the Connes Embedding Problem and the Tsirelson
Problem\, uncovered by Junge et al (2011) and Ozawa (2013). Particular ins
tances of non-local games\, such as binary constraint system games and syn
chronous games\, have played an important role in the pursuit of the resol
ution of these problems. In this talk\, I will summarise part of the opera
tor algebraic toolkit that has proved useful in the study of non-local gam
es and of their perfect strategies\, highlighting the role C*-algebras and
operator systems play in their mathematical understanding.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Karen Strung (Czech Academy of Sciences)
DTSTART:20200716T150000Z
DTEND:20200716T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/9
DESCRIPTION:by Karen Strung (Czech Academy of Sciences) as part of UK Virt
ual operator algebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gábor Szabó (KU Leuven)
DTSTART:20200730T150000Z
DTEND:20200730T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/10
DESCRIPTION:by Gábor Szabó (KU Leuven) as part of UK Virtual operator al
gebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sven Raum (Stockholm University)
DTSTART:20200716T154500Z
DTEND:20200716T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/11
DESCRIPTION:Title: C*-superrigidity\nby Sven Raum (Stockholm University) as part o
f UK Virtual operator algebras seminar\n\n\nAbstract\nA discrete group is
called C*-superrigid\, if it can be recovered from its reduced group C*-al
gebra. This notation parallels W*-superrigidty for von Neumann algebras. M
otivated by Higman's unit conjecture for complex group rings\, one can ask
whether every torsion-free group is C*-superrigid. Surprisingly until 201
7 the only known examples of torsion-free C*-superrigid groups were abelia
n.\nIn this talk\, I will introduce you to the concept and motivation of C
*-superrigidity. Subsequently\, I will describe developments around this t
opic since 2017\, and exemplify relevant ideas through my joint work with
Caleb Eckhardt\, which shows that all finitely generated\, torsion-free\,
2-step nilpotent groups are C*-superrigid. I will end the talk by sharing
my perspective on the future of the topic.\n\nAssumed Knowledge: Basics of
operator algebras.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ulrich Pennig (Cardiff)
DTSTART:20200813T150000Z
DTEND:20200813T160000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/12
DESCRIPTION:Title: An Introduction to Dixmier-Douady theory\nby Ulrich Pennig (Car
diff) as part of UK Virtual operator algebras seminar\n\n\nAbstract\nA bun
dle of C*-algebras is a collection of algebras continuously parametrised b
y a topological space. There are (at least) two different definitions in o
perator algebras that make this intuition precise: Continuous C(X)-algebra
s provide a flexible analytic point of view\, while locally trivial C*-alg
ebra bundles allow a classification via homotopy theory. The section algeb
ra of a bundle in the topological sense is a C(X)-algebra\, but the conver
se is not true. In this talk I will compare these two notions using the cl
assical work of Dixmier and Douady on bundles with fibres isomorphic to th
e compacts as a guideline. I will then explain joint work with Marius Dad
arlat\, in which we showed that the theorems of Dixmier and Douady can be
generalized to bundles with fibers isomorphic to stabilized strongly self-
absorbing C*-algebras. An important feature of the theory is the appearanc
e of higher analogues of the Dixmier-Douady class.\n\nAssumed Knowledge: b
asic familiarity with C*-algebras\, some background in topology\, in parti
cular cohomology\, might be useful\, but is not required\, similarly for s
trongly self-absorbing C*-algebras.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Veronique Fischer (University of Bath)
DTSTART:20200730T154500Z
DTEND:20200730T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/13
DESCRIPTION:by Veronique Fischer (University of Bath) as part of UK Virtua
l operator algebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amine Marrakch (Lyon)
DTSTART:20200813T154500Z
DTEND:20200813T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/14
DESCRIPTION:Title: The Gaussian functor and its applications\nby Amine Marrakch (L
yon) as part of UK Virtual operator algebras seminar\n\n\nAbstract\nThe Ga
ussian functor associates to every real hilbert space a canonical probabil
ity space called the Gaussian probability space. This construction is an i
mportant tool with a wide range of applications in various domains : ergod
ic theory\, probability theory\, operator algebras\, representation theory
and more recently geometric group theory. In this talk\, I will recall th
is construction and present several applications.\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Makoto Yamashita (University of Oslo)
DTSTART:20200910T150000Z
DTEND:20200910T154500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/16
DESCRIPTION:Title: Compact quantum Lie groups\nby Makoto Yamashita (University of
Oslo) as part of UK Virtual operator algebras seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gábor Szabó (KU Leuven)
DTSTART:20200910T154500Z
DTEND:20200910T163000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/17
DESCRIPTION:Title: A peek into the classification of C*-dynamics\nby Gábor Szabó
(KU Leuven) as part of UK Virtual operator algebras seminar\n\nAbstract:
TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lauren Ruth (Mercy College\, NY)
DTSTART:20201022T143000Z
DTEND:20201022T151500Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/18
DESCRIPTION:Title: Von Neumann algebras and equivalences between groups\nby Lauren
Ruth (Mercy College\, NY) as part of UK Virtual operator algebras seminar
\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robin Deeley (University of Colorado\, Boulder)
DTSTART:20201022T151500Z
DTEND:20201022T160000Z
DTSTAMP:20260404T111102Z
UID:UKVOAS/19
DESCRIPTION:Title: The C*-algebras associated to a Wieler solenoid\nby Robin Deele
y (University of Colorado\, Boulder) as part of UK Virtual operator algebr
as seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/UKVOAS/19/
END:VEVENT
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