BEGIN:VCALENDAR
VERSION:2.0
PRODID:"-//Durham University/Seminars"
METHOD:PUBLISH
BEGIN:VEVENT
UID:SEMINAR5470
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180118T130000Z
DTEND:20180118T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: Integrals over unitary groups, maps
on surfaces, and Euler characteristics
DESCRIPTION:Michael Magee, Durham University\nThis is joint work with Doro
n Puder (Tel Aviv University). \nFor a positive integer r, fix a word w in
the free\ngroup on r generators. Let G be any group. The word\nw gives
a `word map' from G^r to G: we simply replace the\ngenerators in w by the
corresponding elements of G. We\nagain call this map w. The push forward
of Haar measure under\nw is called the w-measure on G. We are interested
in\nthe case G = U(n), the compact Lie group of n-dimensional\nunitary ma
trices. A motivating question is: to what extent do the\nw-measures on U(
n) determine algebraic properties of the\nword w?\n\nFor example, we have
proved that one can detect the\n'stable commutator length' of w from the w
-measures on\nU(n). Our main tool is a formula for the Fourier\ncoefficie
nts of w-measures; the coefficients are rational\nfunctions of the dimensi
on n, for reasons coming from\nrepresentation theory.\n\nWe can now explai
n all the Laurent coefficients of these\nrational functions in terms of Eu
ler\ncharacteristics of certain mapping class groups.\nI'll explain all th
is in my talk, which should be broadly accessible and of general\ninterest
. Time permitting, I'll also invite the audience to consider some\nremain
ing open questions.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5498
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180119T130000Z
DTEND:20180119T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: Generalised global symmetries in fie
ld theory and holography
DESCRIPTION:Sašo Grozdanov , MIT\nAfter an extended introduction on hydro
dynamics, which will include its recently uncovered connection with many-b
ody chaos, I will discuss the concept of generalised global symmetries and
their applications. From the point of view of effective field theory, I w
ill first present a recent, comprehensive reformulation of magnetohydrodyn
amics, which is a theory of low-energy excitations in plasmas. I will then
discuss our construction of holographic duals to theories with generalise
d global symmetries. Of particular focus will be a five-dimensional bulk t
heory with a dynamical two-form gauge field, which is dual to a field theo
ry in which magnetohydrodynamics captures the dynamics of its infra-red li
mit. In the final part of this talk, I argue that generalised global symme
tries are a powerful tool for constructing theories with dynamical defects
even in the absence of known microscopic origins of such symmetries. As a
n example, I will use the theory of viscoelastic states and formulate it b
oth in effective field theory and holography.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5190
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180122T000000Z
DTEND:20180122T010000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars: Identifying the effect of public holidays on
daily demand for gas
DESCRIPTION:Sarah Heaps, Newcastle University\nGas distribution networks n
eed to ensure the supply and demand for gas are balanced at all times. In
practice, this is supported by a number of forecasting exercises which, if
performed accurately, can substantially lower operational costs, for exam
ple through more informed preparation for severe winters. Amongst domestic
and commercial customers, the demand for gas is strongly related to the w
eather and patterns of life and work. In regard to the latter, public holi
days have a pronounced effect, which often extends into neighbouring days.
In the literature, the days over which this protracted effect is felt are
typically pre-specified as fixed windows around each public holiday. This
approach fails to allow for any uncertainty surrounding the existence, du
ration and location of the protracted holiday effects. We introduce a nove
l model for daily gas demand which does not fix the days on which the prox
imity effect is felt. Our approach is based on a four-state, non-homogeneo
us hidden Markov model with cyclic dynamics. In this model the classificat
ion of days as public holidays is observed, but the assignment of days as
``pre-holiday'', ``post-holiday'' or ``normal'' is unknown. Explanatory va
riables recording the number of days to the preceding and succeeding publi
c holidays guide the evolution of the hidden states and allow smooth trans
itions between normal and holiday periods. To allow for temporal autocorre
lation, we model the logarithm of gas demand at multiple locations, condit
ional on the states, using a first-order vector autoregression (VAR(1)). W
e take a Bayesian approach to inference and consider briefly the problem o
f specifying a prior distribution for the autoregressive coefficient matri
x of a VAR(1) process which is constrained to lie in the stationary region
. We summarise the results of an application to data from Northern Gas Net
works (NGN), the regional network serving the North of England, a prelimin
ary version of which is already being used by NGN in its annual medium-ter
m forecasting exercise.\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5179
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180122T160000Z
DTEND:20180122T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: Local geometric Galois representations
DESCRIPTION:Maja Volkov, Universite de Mons\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5538
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180123T140000Z
DTEND:20180123T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:CM 219
SUMMARY:Arithmetic Study Group: Supersingular abelian varieties with non s
emisimple Tate module
DESCRIPTION:Maja Volkov, Universite de Mons\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5175
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180125T130000Z
DTEND:20180125T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: The prescribed Weingarten curvature
s problem in hyperbolic space
DESCRIPTION:Daniel Ballesteros-Chavez, Durham\nWe will present a detailed
proof for the existence of a closed convex hypersurface in the hyperbolic
ball with prescribed 1 \le k < n - Weingarten curvature. Specifically, we
deal with the equivariant problem for a sufficiently large group of hyperb
olic automorhphisms. The proof proceeds by establishing (nonlinear) strict
ellipticity of the associated PDE. Then we obtain existence in C^{1,a} fo
r an auxiliary problem by Schauder theory, C^2 smoothness using ellipticit
y and a Lemma by Cheng-Yau, and C^{2,a} - regularity by Evans-Krylov. Fina
lly, existence of a solution is established by degree theory in the equiva
riant setting. The results presented are part of the speakers PhD thesis.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5512
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180126T130000Z
DTEND:20180126T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: Thermal Conformal Blocks and their A
dS Representations
DESCRIPTION: Gim Seng Ng, Trinity College Dublin\nWe study conformal block
s for thermal one-point-functions in higher-dimensional conformal field th
eories. These thermal one-point blocks can be represented as AdS Witten-di
agram-like integrals. In the absence of angular potentials, the thermal on
e-point blocks are given analytically as generalised hypergeometric functi
ons. As an application, by studying behavior of thermal one-point function
s in the high-temperature limit, we deduce an asymptotic formula for three
point coefficients of one light operator and two heavy operators. This re
sult agrees with expectations coming from eigenstate thermalization hypoth
esis.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5449
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180126T140000Z
DTEND:20180126T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: Stochastic homogenisation of high-co
ntrast media
DESCRIPTION:Mikhail Cherdantsev, Cardiff University\nIt has been known for
almost two decades (starting with a 2000 paper by Zhikov) that elliptic p
artial differential operators with periodic high-contrast coefficients, de
scribing certain composite materials, have band gap spectrum described by
Zhikov's beta-function in the homogenisation limit. The homogenised operat
or is of the two-scale nature, it has a macroscopic and microscopic (corre
sponding to the period of the composite) parts. While the stochastic homog
enisation is a well established area of mathematics, the high-contrast sto
chastic homogenisation has hardly been addressed, and it seems that there
is not a single paper studying the spectral problems in high-contrast stoc
hastic homogenisation. We initiate the research in this direction and show
that similarly to the periodic case in the stochastic high contrast setti
ng(under some lenient conditions) the spectrum has a band gap structure c
haracterised by a function similar to Zhikov's beta-function, we study the
limit two-scale operator with the stochastic microscopic component and pr
ove the convergence of the spectra.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5186
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180129T000000Z
DTEND:20180129T010000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Christina Goldschmidt, University of Oxford\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5326
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180129T160000Z
DTEND:20180129T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium:
DESCRIPTION:James Maynard, Oxford\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5528
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180130T140000Z
DTEND:20180130T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Arithmetic Study Group: TBD
DESCRIPTION:James Maynard, Oxford\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5479
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180201T130000Z
DTEND:20180201T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: tba
DESCRIPTION:Yuguo Qin, USTC Hefei\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5536
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180202T130000Z
DTEND:20180202T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: Integrability in lower dimensional A
dS/CFT
DESCRIPTION:Andrea Fontanella, University of Surrey\nIn this talk, I shall
consider integrable scattering processes of massless string modes in AdS2
and AdS3 backgrounds.\nIn the first part, I will present a formulation of
the Bethe ansatz in an AdS2 background by using a technique first develop
ed in condensed matter. This technique relies on an particular algebraic e
quation which the S-matrix entries must satisfy, the so-called “free-fer
mion condition’’.\nThis technique allows us to overcome the problem of
lack of reference state in AdS2 backgrounds, which prevented for many yea
rs the Bethe ansatz formulation within the standard procedure.\nIn the sec
ond part, I shall focus on an AdS3 background. I will show that the S-matr
ix, in addition to the background isometry, admits a further symmetry, the
so-called "quantum deformed 2D Poincaré group". I will show how the nove
l symmetry allows us to interpret geometrically the scattering process in
the fibre bundle language. \nThis talk is based on arXiv:1608.01631 [hep-t
h] and arXiv:1706.02634 [hep-th].
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5500
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180202T140000Z
DTEND:20180202T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: The gamma-ray flares of the Crab neb
ula
DESCRIPTION:Serguei Komissarov, University of Leeds\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5505
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180205T000000Z
DTEND:20180205T010000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars: Extensive condensation in preferential attach
ment with choice
DESCRIPTION:Nic Freeman, Sheffield University\nI will introduce a new pref
erential attachment model in which each vertex has an associated fitness v
alue. I will discuss the behaviour of the model as the number of nodes ten
ds to infinity, including the existence of a "condensation" phase in which
a small number of especially fit vertices are able to (temporarily) gain
disproportionately large degrees. The work relies on a new connection betw
een preferential attachment with fitnesses, and branching-coalescing parti
cle systems; it leads to a clear and simple explanation for why the conden
sation phenomenon occurs.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5456
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180205T160000Z
DTEND:20180205T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium: The Cohen-Lenstra principle in pure mathema
tics
DESCRIPTION:Alex Bartel, Glasgow\nOften, when an algebraic object is drawn
at random, it is isomorphic to a given object A with probability that is
proportional to 1/#Aut(A). Cohen and Lenstra observed in the early 1980s t
hat this principle explains heuristically numerous phenomena in the behavi
our of ideal class groups of quadratic number fields that had puzzled numb
er theorists for decades. In recent years, similar principles have been ob
served to govern the behaviour of many other objects in pure mathematics,
from sandpile groups of graphs, over Selmer groups of elliptic curves, to
cohomology groups of hyperbolic 3-manifolds. Indeed, the same principle ap
pears to hold even in certain situations in which #Aut(A) may be infinite,
in which case it requires some creativity to apply it rigorously. In addi
tion to "real world" applicability, the probability distributions on the r
espective classes of algebraic objects that one obtains from the above rul
e also turn out to have some fascinating properties. In this talk, I will
attempt to give an overview of the original ideas behind the Cohen-Lenstra
heuristics and of the modern research that they have prompted.\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5524
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180206T140000Z
DTEND:20180206T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Arithmetic Study Group: Class groups of "random" number fields
DESCRIPTION:Alex Bartel, Glasgow University\nThe Cohen-Lenstra heuristics,
postulated in the early 1980s, say that the sequence of ideal class group
s of imaginary quadratic number fields can be modelled as a sequence of ra
ndom finite abelian groups, where a finite abelian group gets a probabilit
y weight that is inversely proportional to the size of its automorphism gr
oup. They also propose a model for class groups of real quadratic fields.
This was extended in the early 1990s by Cohen-Martinet to much more genera
l families of number fields. I will present very recent joint work with He
ndrik Lenstra, in which we are trying to understand the Cohen-Lenstra-Mart
inet heuristics better. Among other things, this entails disproving them a
nd proposing corrected versions.\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5503
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180208T130000Z
DTEND:20180208T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar:
DESCRIPTION:Katie Spalding, Loughborough\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5513
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180209T130000Z
DTEND:20180209T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars: Aretakis charges and null infinity
DESCRIPTION:Mahdi Godazgar, Zurich, ETH\nI will describe a recent discover
y of conserved charges on the horizon of extremal black holes, which lead
s in particular to their classical dynamical instability. I will then rel
ate these somewhat unexpected charges to the very well-understood Newman-P
enrose charges at the null infinity of asymptotically flat spaces.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5516
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180209T140000Z
DTEND:20180209T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: Sharp free boundary regularity in ob
stacle problems
DESCRIPTION:Alessio Figalli, ETH Zurich\nThe so-called Stefan problem desc
ribes the temperature distribution in a homogeneous medium undergoing a ph
ase change, for example ice passing to water, and one aims to describe the
regularity of the interface separating the two phases.\n\nIn its stationa
ry version, the Stefan problem reduces to the classical obstacle problem,
which consists in finding the equilibrium position of an elastic membrane
whose boundary is held fixed, and that is constrained to lie above a given
obstacle.\n\nThe aim of this talk is to give an overview of the classical
theory of the obstacle problem, and then discuss some very recent develop
ments on the optimal regularity of the free boundary both in the static an
d the parabolic setting.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5511
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180212T140000Z
DTEND:20180212T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Theodore Kypraios, University of Nottingham\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5530
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180215T130000Z
DTEND:20180215T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar:
DESCRIPTION:Oleg Karpenkov, Liverpool\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5526
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180216T130000Z
DTEND:20180216T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars:
DESCRIPTION:Dhritiman Nandan, University of Edinburgh\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5543
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180219T000000Z
DTEND:20180219T010000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Peter Nejjar, IST Austria\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5455
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180219T160000Z
DTEND:20180219T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium:
DESCRIPTION:Andrea Mondino, Warwick\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5529
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180220T140000Z
DTEND:20180220T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Arithmetic Study Group:
DESCRIPTION:Erez Nesharim, University of York\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5522
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180222T130000Z
DTEND:20180222T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: TBA
DESCRIPTION:Katrin Leschke, University of Leicester\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5504
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180223T130000Z
DTEND:20180223T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars:
DESCRIPTION:David Vegh, Queen Mary, University of London\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5535
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180223T140000Z
DTEND:20180223T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: TBA
DESCRIPTION:Spiro Antiochos, NASA Goddard Space Flight Center\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5523
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180226T140000Z
DTEND:20180226T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars: ABC for expensive simulators
DESCRIPTION:Richard Everitt, University of reading\nApproximate Bayesian c
omputation (ABC) is now an established technique for statistical inference
in the form of a simulator, and approximates the likelihood at a paramete
r θ by simulating auxiliary data sets x and evaluating the distance of x
from the true data y. Synthetic likelihood is a related approach that uses
simulated auxiliary data sets to contract a Gaussian approximation to the
likelihood. However, these approaches are not computationally feasible in
cases where using the simulator for each θ is very expensive. This talk
investigates two alternative strategies for inference in such a situation.
The first is delayed acceptance ABC-SMC (arxiv.org/abs/1708.02230), in wh
ich a cheap simulator is used to rule out parts of the parameter space tha
t are not worth exploring. The second is bootstrapped synthetic likelihood
(arxiv.org/abs/1711.05825), which uses the bootstrap to cheaply estimate
the synthetic likelihood. We also examine a synthetic likelihood approxima
tion that is constructed, using the bag of little bootstraps, from subsamp
led data sets. Applications to stochastic differential equation models and
doubly intractable distributions will be presented.\n\n\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5315
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180226T160000Z
DTEND:20180226T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium:
DESCRIPTION:Tom Bridgeland, University of Sheffield\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5532
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180301T130000Z
DTEND:20180301T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: tba
DESCRIPTION:Nicolas Juillet, Universite Paul Sabatier (Strasbourg)\ntba
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5497
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180302T130000Z
DTEND:20180302T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars:
DESCRIPTION:Shlomo Razamat , Technion\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5451
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180302T140000Z
DTEND:20180302T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: TBA
DESCRIPTION:Roger Scott, University of Dundee\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5537
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180305T160000Z
DTEND:20180305T170000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Pure Maths Colloquium:
DESCRIPTION:Nicholas Young , Newcastle\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5521
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180308T130000Z
DTEND:20180308T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: TBA
DESCRIPTION:Frank Neumann, University of Leicester\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5514
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180309T130000Z
DTEND:20180309T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars:
DESCRIPTION:Masaki Shigemori, Queen Mary, University of London\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5515
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180309T140000Z
DTEND:20180309T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: Highly relativistic galaxies are uns
table
DESCRIPTION:Mahir Hadzic, King's College London\nWe describe a systematic
approach to (linear) instability theory for steady galaxies and stars as d
escribed by the Einstein-Vlasov and Einstein-Euler system respectively. On
e of the several outcomes of our analysis is a statement that galaxies wit
h high central redshifts are dynamically unstable. This is a joint work wi
th Zhiwu Lin (GeorgiaTech) and Gerhard Rein (Bayreuth).
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5531
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180312T140000Z
DTEND:20180312T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Jonathan Rougier, University of Bristol\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5541
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180313T140000Z
DTEND:20180313T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:CM 219
SUMMARY:Arithmetic Study Group:
DESCRIPTION:Francesca Bianchi, Oxford University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5518
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180315T130000Z
DTEND:20180315T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Geometry and Topology Seminar: Ultra-parallel complex hyperbolic t
riangle groups
DESCRIPTION:Sam Povall, Liverpool\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5499
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180316T130000Z
DTEND:20180316T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Maths HEP Lunchtime Seminars:
DESCRIPTION:Nick Dorey, Cambridge DAMTP\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5534
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180316T140000Z
DTEND:20180316T150000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: TBA
DESCRIPTION:Georgy Kitavtsev , University of Oxford\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5452
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180427T130000Z
DTEND:20180427T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: TBA
DESCRIPTION:Silvia Dalla, University of Central Lancashire\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5527
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180504T130000Z
DTEND:20180504T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Applied Mathematics Seminars: TBA
DESCRIPTION:Rodrigo Ledesma-Aguilar, Northumbria University\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5211
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180510T150000Z
DTEND:20180510T160000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:CM221
SUMMARY:Statistics Seminars:
DESCRIPTION:Haeran Cho, University of Bristol\n
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5533
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180521T130000Z
DTEND:20180521T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars: Stochastic renewal process models for exact u
navailability quantification of highly reliable systems
DESCRIPTION:Prof Radim Bris, Technical University of Ostrava\nIn previous
research an original methodology for high-performance reliability computin
g was developed which enables exact unavailability quantification of a rea
l maintained highly reliable system containing highly reliable components
with both preventive and corrective maintenance. Whereas the methodology w
as developed for systems containing components with exponential lifetime d
istribution, main objective of this research is generalization of the meth
odology by applying stochastic alternating renewal process models, so as t
o be used for unavailability quantification of systems containing arbitrar
y components without any restrictions on the form of the probability distr
ibution assigned to time to failure and repair duration, i.e. ageing compo
nents are allowed. For this purpose a recurrent linear integral equation f
or point unavailability is derived and proved. This innovative equation is
particularly eligible for numerical implementation, because it does not c
ontain any renewal density, i.e. it is more effective for unavailability c
alculation than the corresponding equation resulting from the traditional
alternating renewal process theory, which contains renewal density. The ne
w equation undergoes the process of discretization which results in numeri
c formula to quantify desired unavailability function. Found component una
vailability functions are used to quantify unavailability of a complex mai
ntained system. System is represented by the use of directed acyclic graph
, which proved to be very effective system representation to quantify reli
ability of highly reliable systems.
END:VEVENT
BEGIN:VEVENT
UID:SEMINAR5327
SEQUENCE:0
DTSTAMP:20180117T215105Z
DTSTART:20180618T130000Z
DTEND:20180618T140000Z
STATUS:CONFIRMED
TRANSP:OPAQUE
LOCATION:
SUMMARY:Statistics Seminars:
DESCRIPTION:Nikolai Kolev, USP, Sao Paulo (IME)\n
END:VEVENT
END:VCALENDAR