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PRODID:-//Centre for Mathematical Sciences - ECPv4.4.5//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Centre for Mathematical Sciences
X-ORIGINAL-URL:http://math-sciences.org
X-WR-CALDESC:Events for Centre for Mathematical Sciences
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170301T160000
DTEND;TZID=UTC+0:20170301T170000
DTSTAMP:20170328T213941
CREATED:20170105T140343Z
LAST-MODIFIED:20170221T090449Z
UID:2229-1488384000-1488387600@math-sciences.org
SUMMARY:Alec Thomas (Lancaster)
DESCRIPTION:Vlasov simulations of thermal plasma waves with relativistic phase velocity in a Lorentz boosted frame For certain classes of relativistic plasma problems\, performing numerical calculations in a Lorentz boosted frame can be even more advantageous for gridded momentum-space-time (e.g.\, Vlasov) problems than has been demonstrated for position space-time problems and result in a potential reduction in the number of calculations needed by a factor ∼γ^6. In this study\, the Lorentz boosted frame technique was applied to the problem of warm wave-breaking limits of plasma waves with relativistic phase velocity. The numerical results are consistent with analytic conclusions. By appropriate normalization and for sufficiently warm plasma\, the dynamics for the Vlasov equation in different Lorentz frames were found to be independent of γ.
URL:http://math-sciences.org/event/alec-thomas-lancaster-2
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170308T140000
DTEND;TZID=UTC+0:20170308T150000
DTSTAMP:20170328T213941
CREATED:20170109T103045Z
LAST-MODIFIED:20170306T085157Z
UID:2259-1488981600-1488985200@math-sciences.org
SUMMARY:David Walker (Exeter)
DESCRIPTION:Visualising Multi-objective Data: From League Tables to Optimisers\, and Back\n\nAbstract: League tables are ubiquitous in modern life\, and describe the performance of individuals\, such as schools\, universities\, hospitals and countries. Each individual is described according to a set of key performance indicators (KPIs)\, which are often aggregated to provide a single score by which the set of individuals can be ranked. Visualising individuals according to the full set of KPIs is a better alternative\, preventing the unavoidable loss of information that results from aggregation. This talk presents methodologies for visualising according to multiple conflicting measures of performance\, taking into account the preference information that characterises this type of data\, with examples including university league tables\, water quality monitoring\, and visualising solutions to multi- and many-objective optimisation problems.\n\n
URL:http://math-sciences.org/event/david-walker-exeter
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Applied Mathematics,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20170308T140000
DTEND;TZID=Europe/London:20170308T150000
DTSTAMP:20170328T213941
CREATED:20170220T134639Z
LAST-MODIFIED:20170306T133559Z
UID:2358-1488981600-1488985200@math-sciences.org
SUMMARY:Matthias Seiss (Kassel University)
DESCRIPTION:Parameter Differential Equations for the Classical Groups and Their Generic Properties\nIn this talk we compute explicit and nice linear differential equations which have the classical groups as differential Galois groups.\n\nThe realization of these groups is done over a differential field which is purely differential transcendental over its constants and so the coefficients of our equations will be differential polynomials in a specific number of differential indeterminates.\n\nWe explain further how we use the geometric structure of the groups for the construction of our equations.\n\nIn a second part of this talk we discuss the generic properties of our linear parameter differential equations and the related problems. In case of the special linear group and the exceptional group of type G2 it turns out that our equations are generic for algebraically closed differential fields.
URL:http://math-sciences.org/event/matthias-seiss-kassel-university
LOCATION:2-5\, Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Pure Mathematics,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170308T160000
DTEND;TZID=UTC+0:20170308T170000
DTSTAMP:20170328T213941
CREATED:20161126T092313Z
LAST-MODIFIED:20170226T084215Z
UID:2083-1488988800-1488992400@math-sciences.org
SUMMARY:Gianmassimo Tasinato (Swansea University)
DESCRIPTION:Cosmological inflation\, effective field theory\, and symmetry breaking\nI'll present new applications of effective field theory -- a standard tool in particle physics and condensed matter -- to early universe inflation. Requiring only to specify which symmetries are broken during the inflationary era\, effective field theory provides a powerful method for analyzing the predictions of inflation in a model independent and general way. I'll discuss the possibility of breaking full diffeomorphism invariance during inflation\, and its observable consequences for the properties of primordial gravitational waves produced in the inflationary era.
URL:http://math-sciences.org/event/gianmassimo-tasinato-swansea-university
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170315T140000
DTEND;TZID=UTC+0:20170315T150000
DTSTAMP:20170328T213941
CREATED:20170109T102912Z
LAST-MODIFIED:20170308T173718Z
UID:2257-1489586400-1489590000@math-sciences.org
SUMMARY:Zainab Bu Sinnah (Plymouth)
DESCRIPTION:Lattice Boltzmann Equation\n\nAbstract: The Lattice Boltzmann Equation method represents a relatively novel way of simulating viscous fluid flows. Similar to traditional methods\, we solve for fluid variables on a regular grid. However\, flow variables at a given grid point are reconstructed as moments of a discrete probability density function f(x\,c_k\,t) and there are k=0\,1\,…8 velocity components in the standard D2Q9 lattice arrangement. Programming of the method is reasonably straightforward and the algorithm is readily parallelised. In this seminar\, we will present\n1-Introduction about Lattice Boltzmann Equation\n2-Poiseuille Flow\n3-Pulsatile flow
URL:http://math-sciences.org/event/zainab-bu-sinnah-plymouth
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Applied Mathematics,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20170315T140000
DTEND;TZID=Europe/London:20170315T150000
DTSTAMP:20170328T213941
CREATED:20170310T104819Z
LAST-MODIFIED:20170315T153921Z
UID:2404-1489586400-1489590000@math-sciences.org
SUMMARY:Jon Woolf (University of Liverpool)
DESCRIPTION:Homotopy theory of stratified spaces\nHomotopy theory\, the study of paths in a space\, is the source of some of our deepest topological insights. Stratified spaces\, spaces with a given decomposition into 'nice pieces' which fit together in a reasonable way\, are a natural generalisation of spaces which arise in many contexts. They have been extensively studied\, but their homotopy theory has been relatively neglected. In this talk I will give some examples and outline a general framework for studying the homotopy theory of stratified spaces\, and some of its consequences.
URL:http://math-sciences.org/event/jon-woolf-university-of-liverpool
LOCATION:2-5\, Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Pure Mathematics,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170315T160000
DTEND;TZID=UTC+0:20170315T170000
DTSTAMP:20170328T213941
CREATED:20160929T095258Z
LAST-MODIFIED:20170312T221111Z
UID:1871-1489593600-1489597200@math-sciences.org
SUMMARY:Maurizio Piai (Swansea University)
DESCRIPTION:Large Mass Hierarchies in Strongly-Coupled Dynamics.\nWe study lattice data on non-Abelian gauge theories in the (near-)conformal regime as well as a simple toy model in the context of gauge/gravity dualities. We focus our attention on the ratio R between the mass of the lightest spin-2 and spin-0 resonances\, that for technical reasons is a particularly convenient and clean observable to study. For models in which (non-perturbative) large anomalous dimensions arise dynamically\, we show indications that this mass ratio can be large\, with R > 5. Moreover\, our results suggest that R might be related to universal properties of the IR fixed point.
URL:http://math-sciences.org/event/maurizio-piai-swansea-university
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20170322T040000
DTEND;TZID=UTC+0:20170322T170000
DTSTAMP:20170328T213941
CREATED:20161208T125258Z
LAST-MODIFIED:20170303T093539Z
UID:2196-1490155200-1490202000@math-sciences.org
SUMMARY:David Wilson (DAMTP Cambridge)
DESCRIPTION:Resonances in coupled-channel scattering from lattice QCD\nUnderstanding the excited spectrum of hadrons from first principles remains a challenging prospect. The majority of excited hadrons are seen as resonances in the scattering of lighter stable hadrons like pions and kaons. Many resonances decay into multiple final states necessitating coupled-channel analyses\, and recently it has become possible to obtain coupled-channel scattering amplitudes from lattice QCD. I will describe the methods used in these calculations\, to first compute large spectra\, that are then used to constrain scattering t-matrices\, from which the complex resonance poles can be extracted. Several recent applications of these methods will be described\, including the first extraction of a strongly-coupled scattering amplitude from QCD where an a0 resonance was found in coupled-channel pi-eta K-Kbar scattering.
URL:http://math-sciences.org/event/david-wilson-damtp-cambridge
LOCATION:2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20170329T140000
DTEND;TZID=Europe/London:20170329T150000
DTSTAMP:20170328T213941
CREATED:20170315T153931Z
LAST-MODIFIED:20170315T153931Z
UID:2410-1490796000-1490799600@math-sciences.org
SUMMARY:Gregory Sankaran (Bath)
DESCRIPTION:Fundamental groups of toroidal compactifications\nLocally symmetric varieties are quotients of a hermitian symmetric space by a suitable discrete group. They are in general not compact\, but there are well-known techniques for compactifying them. The resulting spaces often have major geometric siginificance\, so it is important to understand their geometry and topology. I will focus on the most basic topological invariant\, the fundamental group. This should be a quotient of the discrete group\, but it is not immediately clear which quotient. I will describe joint with with Azniv Kasparian (Sofia) in which we answer this question completely\, by largely geometric methods but giving an answer in Lie-theoretic terms.
URL:http://math-sciences.org/event/gregory-sankaran-bath
CATEGORIES:Pure Mathematics,Seminars
END:VEVENT
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