BEGIN:VCALENDAR
VERSION:2.0
PRODID:"-//Durham University/Seminars"
METHOD:PUBLISH
BEGIN:VEVENT
UID:SEMINAR6548
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210128T130500Z
DTEND:20210128T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom.
SUMMARY:Geometry and Topology Seminar: The Sullivan-conjecture in complex
dimension 4
DESCRIPTION:Csaba Nagy, University of Melbourne\nThe Sullivan-conjecture c
laims that complex projective\ncomplete intersections are classified up to
diffeomorphism by their\ntotal degree, Euler-characteristic and Pontryagi
n-classes. It follows\nfrom work of Kreck and Traving that the conjecture
holds in complex\ndimension 4 if the total degree is divisible by 16. In t
his talk I\nwill present the proof of the remaining cases. It is known tha
t the\nconjecture holds up to connected sum with the exotic 8-sphere (this
is\na result of Fang and Klaus), so the essential part of our proof is\nu
nderstanding the effect of this operation on complete intersections.\nThis
is joint work with Diarmuid Crowley.\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6583
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210129T130000Z
DTEND:20210129T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:https://durhamuniversity.zoom.us/j/99768150791?pwd=RTdIeldsbTJBVU
dSbmFuT1c1SndBUT09
SUMMARY:Maths HEP Lunchtime Seminars: Moduli-dependent Calabi-Yau and SU(3
)-structure metrics from Machine Learning
DESCRIPTION:Fabian Ruehle, CERN\nCalabi-Yau manifolds play a crucial role
in string compactifications. Yau's theorem guarantees the existence of a m
etric that satisfies the string's equation of motion. However, Yau's proof
is non-constructive, and no analytic expressions for metrics on Calabi-Ya
u threefolds are known. We use machine learning, more precisely neural net
works, to learn Calabi-Yau metrics and their complex structure moduli depe
ndence. \nI will start with an introduction to Calabi-Yau manifolds and th
eir moduli. After that, I will give a brief introduction to neural network
s. Using an example, I will then illustrate how we train neural networks t
o find Calabi-Yau metrics by solving the underlying partial differential e
quations. The approach generalizes to more general manifolds and can hence
also be used for manifolds with reduced structure, such as SU(3) structur
e or G2 manifolds, which feature in string compactifications with flux and
in the M-theory formulation of string theory, respectively. I will illust
rate this generalization for a particular SU(3) structure metric and compa
re the machine learning result to the known, analytic expression.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6571
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210129T130000Z
DTEND:20210129T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar: Dimers in statistical mechanics and genus 1 H
arnack curves in algebraic geometry
DESCRIPTION:Beatrice de Tiliere, University Paris Dauphine\nThe dimer mode
l represents the adsorption of diatomic molecules on the surface of a crys
tal. It is modeled as random perfect matchings of a fixed planar graph. Wh
en the underlying graph is bipartite and periodic, one can naturally assig
n to such a model a curve, known as the spectral curve. By results of Keny
on, Okounkov and Sheffield, this curve is Harnack and there is a correspon
dence between Harnack curves and such dimer models.\nWe consider the dimer
model in the above context assuming moreover that edges are assigned Fock
's elliptic weights. We prove that spectral curves of these dimer models a
re in correspondence with genus 1 Harnack curves. We also prove an explici
t local expression for the two-parameter family of ergodic Gibbs measures
and for the slope of the measures. This is joint work with Cédric Boutill
ier and David Cimasoni. Note that in the course of the talk, we will be de
fining the dimer model, Harnack curves and Fock's elliptic weights, i.e.,
this is not assumed to be known.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6600
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210201T130000Z
DTEND:20210201T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:ZOOM
SUMMARY:Statistics Seminars: Bayes Linear Emulation of Simulator Networks
DESCRIPTION:Samuel Edward Jackson, University of Southampton\nModern compu
tational science allows complex scientific processes to be described by ma
thematical models implemented in computer codes, or simulators. When these
simulators are computationally expensive, it is common to approximate the
m using statistical emulators constructed from computer experiments. Often
, the overarching system of interest is best modelled via a chain, series
or network of simulators, with inputs to some simulators arising as output
s from other simulators. Motivated by an epidemiological simulator chain t
o model the airborne dispersion of an infectious disease, we have develope
d novel methods for linking statistical emulators of the component simulat
ors within a network. These methods, developed within a Bayes linear frame
work, exploit the simpler structure that is typically observed for compone
nt simulators and account for simulator input uncertainty induced by links
in the network. This talk will discuss and demonstrate the advantages of
these methods compared to use of a single emulator of the composite simula
tor network for a variety of examples, including the motivating epidemiolo
gical application.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6616
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210203T120000Z
DTEND:20210203T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Analysis and/of PDE: Asymptotic gradient flow structures of PDEs w
ith excluded volume effects
DESCRIPTION:Marie-Therese Wolfram, Warwick\nThe physical size of particles
plays an important role in many applications in physics and the life scie
nces. However, the problem of including such finite size effects in mean-f
ield models consistently is mostly open. In this talk I will discuss diffe
rent microscopic models for mixtures of hard-spheres as well as their form
al limiting PDEs. These continuum equations often have similar properties,
such as degenerate mobilities, cross-diffusion terms or a lack of an unde
rlying gradient flow (GF) structure. The lack of a full GF structure is of
ten caused by the approximations made when passing to the limit. But the r
esulting systems often have an asymptotic gradient flow (AGF) structure, t
hat is a gradient flow structure up to a certain order. This structure can
be used to study the behavior of solutions close to equilibrium. However,
different entropy-mobility pairs can be found to describe such equations
(up to a certain order), some of them satisfying physical principles, othe
rs not. I will discuss the behavior of solutions to these possible entropy
-mobility pairs and illustrate their difference with numerical simulations
.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6389
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210204T130500Z
DTEND:20210204T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: A general approach to stability of
the soap bubble theorem and related problems
DESCRIPTION:Julian Scheuer, Cardiff University\nThe soap bubble theorem sa
ys that a closed, embedded surface of the Euclidean space with constant me
an curvature must be a round sphere. Especially in real-life problems it i
s of importance whether and to what extent this phenomenon is stable, i.e.
when a surface with almost constant mean curvature is close to a sphere.
This problem has been receiving lots of attention until today, with satisf
actory recent solutions due to Magnanini/Pogessi and Ciraolo/Vezzoni.\n\nT
he purpose of this talk is to discuss further problems of this type and to
provide two approaches to their solutions. The first one is a new general
approach based on stability of the so-called "Nabelpunktsatz". The second
one is of variational nature and employs the theory of curvature flows.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6533
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210204T140000Z
DTEND:20210204T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Centre for Particle Theory Colloquia: TBA
DESCRIPTION:Ben Hoare, Durham University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6572
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210205T120000Z
DTEND:20210205T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Antoine Jego, University of Vienna\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6584
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210205T130000Z
DTEND:20210205T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: TBA
DESCRIPTION:Joe Davighi, Cambridge University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6603
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210208T130000Z
DTEND:20210208T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: Functional Analysis and Metric Geometry
DESCRIPTION:Nicola Gigli, SISSA\nAim of the talk is to present some aspect
s of the important role that functional analysis has in the context of met
ric geometry. I shall discuss both the case of synthetic description of lo
wer Ricci curvature bounds, where this role is by now well understood, and
some potential applications to the world of lower sectional curvature bou
nds, where it might potentially lead to the solution of long-standing open
problems.\n\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6580
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210208T130000Z
DTEND:20210208T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Helga Wagner, Johannes Kepler University Linz\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6597
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210210T120000Z
DTEND:20210210T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Analysis and/of PDE: The phenomenon of dispersive revivals
DESCRIPTION:Beatrice Pelloni, Heriot-Watt\nI will give an introduction to
the phenomenon of “revivals”, or “dispersive quantisation”. A
lthough first reported experimentally in 1835 by Talbot, this phenomenon w
as only studied in the ’90’s. In particular, in the context of PDEs,
it was studied for the periodic free space Schroedinger equation by Berry
and al, and it was then rediscovered for the Airy equation by Peter Olver
in 2010. Since then, a sizeable literature has examined revivals for the
periodic problem for linear dispersive equations with polynomial dispersio
n relation. What I will discuss in this talk is further occurrences of thi
s phenomenon for different boundary conditions, a novel form of revivals f
or more general dispersion relations and nonlocal equations such as the li
nearised Benjamin-Ono equation, and nonlinear (integrable) generalisations
. This work is joint with Lyonell Boulton, George Farmakis, Peter Olve
r and David Smith.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6549
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210211T130500Z
DTEND:20210211T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom.
SUMMARY:Geometry and Topology Seminar: TBA
DESCRIPTION:Luna Lomonaco, IMPA\nTBA
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6585
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210212T130000Z
DTEND:20210212T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:https://durhamuniversity.zoom.us/j/99768150791?pwd=RTdIeldsbTJBVU
dSbmFuT1c1SndBUT09
SUMMARY:Maths HEP Lunchtime Seminars: TBA
DESCRIPTION:Agnese Bissi, Uppsala University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6573
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210212T150000Z
DTEND:20210212T160000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Lisa Hartung, Johannes Gutenberg University Mainz\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6587
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210215T130000Z
DTEND:20210215T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: TBC
DESCRIPTION:Radha Kessar, City University London\nTBC
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6601
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210215T130000Z
DTEND:20210215T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:ZOOM
SUMMARY:Statistics Seminars: Deep Learning, Challenges and Opportunities
DESCRIPTION:Vahid Partovi Nia, Huawei Noah’s Ark Computer Vision Lab, an
d Ecole Polytechnique de Montreal\nCanada, specially Montreal is the birth
place of deep learning. Starting with Prof. Hebb a McGill faculty who init
iated learning, ending up with Prof. Bengio a University of Montreal facul
ty who won the Turing award in 2019 for his contribution in artificial int
elligence and deep neural networks.\n \nWhile deep learning is considered
one of the breakthroughs of the century in predictive modelling and artifi
cial intelligence, a lot of questions remain unanswered in the field. Here
I try to make you familiar with the context of deep learning and try to a
ttach it to the classical machine learning approaches to bring an intuitio
n behind this blackbox.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6495
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210218T130500Z
DTEND:20210218T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom.
SUMMARY:Geometry and Topology Seminar: Counts of secant planes to varietie
s, Virasoro algebras, and universal polynomials
DESCRIPTION:Mara Ungureanu, Universität Freiburg\nFor a curve in projecti
ve space, the count of varieties parametrising its secant planes is among
the most studied problems in classical enumerative geometry. We shall sta
rt with a gentle introduction to secant varieties and then explore the con
nection between their enumerative geometry and Virasoro algebras on one si
de, and tautological integrals on the other.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6542
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210218T140000Z
DTEND:20210218T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Centre for Particle Theory Colloquia: TBA
DESCRIPTION:Stephen Jones, Durham University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6574
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210219T150000Z
DTEND:20210219T160000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Riddhipratim Basu, International Centre for Theoretical Scien
ces of the Tata Institute of Fundamental Research \n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6604
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210222T130000Z
DTEND:20210222T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: TBC
DESCRIPTION:Özlem Imamoglu, ETH Zürich\nTBC
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6592
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210225T130500Z
DTEND:20210225T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom.
SUMMARY:Geometry and Topology Seminar: TBA
DESCRIPTION:Michael Wiemeler, Universität Münster\nTBA
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6575
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210226T130000Z
DTEND:20210226T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Tomas Berggren, Royal Institute of Technology, KTH\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6564
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210304T130500Z
DTEND:20210304T140500Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: TBA
DESCRIPTION:Christine Breiner, Fordham University\nTBA
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6543
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210304T140000Z
DTEND:20210304T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Centre for Particle Theory Colloquia: TBA
DESCRIPTION:Nader El-Bizri, American University of Beirut\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6576
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210305T130000Z
DTEND:20210305T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Daniel Remenik, Universidad de Chile\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6581
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210308T130000Z
DTEND:20210308T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Antony Overstall, University of Southampton\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6617
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210310T120000Z
DTEND:20210310T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Analysis and/of PDE: tba
DESCRIPTION:Anna Siffert, Munster\ntba
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6577
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210312T130000Z
DTEND:20210312T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Gerardo Barrera Vargas, University of Helsinki\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6588
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210315T130000Z
DTEND:20210315T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: TBC
DESCRIPTION:Henna Koivusalo, University of Bristol\nTBC
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6544
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210318T140000Z
DTEND:20210318T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Centre for Particle Theory Colloquia: TBA
DESCRIPTION:Prateek Agrawal, Oxford University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6578
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210319T120000Z
DTEND:20210319T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:Zoom
SUMMARY:Probability Seminar:
DESCRIPTION:Tyler Helmuth, Durham University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6602
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210322T130000Z
DTEND:20210322T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:ZOOM
SUMMARY:Statistics Seminars:
DESCRIPTION:Christophe Berenguer , Equipe Safe, Controlled and Monitored S
ystems\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6582
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210430T120000Z
DTEND:20210430T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: TBA
DESCRIPTION:Alba Grassi, CERN and Geneva University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR6605
SEQUENCE:0
DTSTAMP:20210128T014638Z
DTSTART:20210510T120000Z
DTEND:20210510T130000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: TBC
DESCRIPTION:Dustin Clausen, University of Copenhagen\nTBC
END:VEVENT
END:VCALENDAR