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Upcoming events in Mathematics

(previous see here)
Mon 21/01/19 15:00
Dalhousie 1F18
Mathematics Seminar
Prof. Kevin Painter (Heriot-Watt University)
In silico modelling of Green Turtle homing to Ascension Island.
abstract

Abstract

A dot in the vastness of the Atlantic, Ascension Island remains a lifelong goal for the green sea turtles that hatched there, returning as adults every three or four years to nest. This navigating puzzle was brought to the scientific community's attention by Charles Darwin and remains a topic of considerable speculation. Various cues have been suggested, with orientation to geomagnetic field elements and following odour plumes to their island source among the most compelling. We develop agent based and continuous models that model the oriented movement of turtles in the oceanic environment, utilising ocean flow, wind and geomagnetic field data sets. Through a comprehensive in silico investigation we test the hypothesis that multimodal cue following, in which turtles utilise multiple guidance cues, is the most effective strategy. Our analysis shows how population homing efficiency improves as the number of utilised cues is increased, even under “extreme” scenarios where the overall strength of navigating information decreases.

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Mon 28/01/19 14:00
Fulton G20
Mathematics Seminar
Prof. Toby Wood (Newcastle Unversity)
MHD in neutron stars
abstract

Abstract

Neutron stars harbour magnetic fields of up to 10^16 Gauss -- the strongest in the Universe. This field is amplified by rapid contraction and dynamo action during the star's formation, and survives on long timescales because of the star's near-perfect conductivity. In the star's solid crust the field is supported by the flow of electrons, whereas in the superfluid core it is supported by the quantized circulation of protons. The field plays a central role in all the observable phenomena of pulsars, including starquakes, rotational glitches, and giant flares. This talk will review the magneto-hydrodynamics of neutron stars, and the implications for pulsar observations.

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Mon 04/02/19 15:00
Dalhousie 1F18
Mathematics Seminar
Dr. Chiara Saffirio (University of Zurich)
From the many-body quantum dynamics to the Vlasov equation.
abstract

Abstract

We review some results on the joint mean-field and semiclassical limit of the N-body Schrödinger dynamics leading to the Vlasov equation, which is a model in kinetic theory for charged or gravitating particles. The results we present include the case of singular interactions and provide explicit estimates on the convergence rate, using the Hartree-Fock theory for interacting fermions as a bridge between many-body and Vlasov dynamics.

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Mon 25/03/19 15:00
Dalhousie 2F13
Mathematics Seminar
Dr. Danielle Hilhorst (Universite Paris-Sud)
(Themes: Stochastic Partial Differential Equations)