# Research Seminar Series

### Applied Mathematics Seminars

## Applied Mathematics Seminars: A mean field approach to the quasineutral limit for the Vlasov-Poisson equation

27 October 2017 14:00 in *CM219*

The Vlasov-Poisson system is a kinetic equation that models collisionless plasma. A plasma has a characteristic scale called the Debye length, which is typically much shorter than the scale of observation. In this case the plasma is called ‘quasineutral’. This motivates studying the limit in which the ratio between the Debye length and the observation scale tends to zero. Under this scaling, the formal limit of the Vlasov-Poisson system is the Kinetic Isothermal Euler system. The Vlasov-Poisson system itself can formally be derived as the limit of a system of ODEs describing the dynamics of a system of N interacting particles, as the number of particles approaches infinity. The rigorous justification of this mean field limit remains an open problem. In this talk I will present recent joint work with Mikaela Iacobelli, in which we derive the Kinetic Isothermal Euler system from a regularised particle model. Our approach uses a combined mean field and quasineutral limit.

Contact david.bourne@durham.ac.uk for more information

### Arithmetic Study Group

## Applied Mathematics Seminars: A mean field approach to the quasineutral limit for the Vlasov-Poisson equation

27 October 2017 14:00 in *CM219*

The Vlasov-Poisson system is a kinetic equation that models collisionless plasma. A plasma has a characteristic scale called the Debye length, which is typically much shorter than the scale of observation. In this case the plasma is called ‘quasineutral’. This motivates studying the limit in which the ratio between the Debye length and the observation scale tends to zero. Under this scaling, the formal limit of the Vlasov-Poisson system is the Kinetic Isothermal Euler system. The Vlasov-Poisson system itself can formally be derived as the limit of a system of ODEs describing the dynamics of a system of N interacting particles, as the number of particles approaches infinity. The rigorous justification of this mean field limit remains an open problem. In this talk I will present recent joint work with Mikaela Iacobelli, in which we derive the Kinetic Isothermal Euler system from a regularised particle model. Our approach uses a combined mean field and quasineutral limit.

Contact david.bourne@durham.ac.uk for more information

### Centre for Particle Theory Colloquia

## Applied Mathematics Seminars: A mean field approach to the quasineutral limit for the Vlasov-Poisson equation

27 October 2017 14:00 in *CM219*

The Vlasov-Poisson system is a kinetic equation that models collisionless plasma. A plasma has a characteristic scale called the Debye length, which is typically much shorter than the scale of observation. In this case the plasma is called ‘quasineutral’. This motivates studying the limit in which the ratio between the Debye length and the observation scale tends to zero. Under this scaling, the formal limit of the Vlasov-Poisson system is the Kinetic Isothermal Euler system. The Vlasov-Poisson system itself can formally be derived as the limit of a system of ODEs describing the dynamics of a system of N interacting particles, as the number of particles approaches infinity. The rigorous justification of this mean field limit remains an open problem. In this talk I will present recent joint work with Mikaela Iacobelli, in which we derive the Kinetic Isothermal Euler system from a regularised particle model. Our approach uses a combined mean field and quasineutral limit.

Contact david.bourne@durham.ac.uk for more information

### Computing Seminars/Talks

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information

### CPT Student Seminar

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information

### Departmental Research Colloquium

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information

### Distinguished Lectures and Public Lectures

27 October 2017 14:00 in *CM219*

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### Geometry and Topology Seminar

27 October 2017 14:00 in *CM219*

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### Informal HEP Journal club

27 October 2017 14:00 in *CM219*

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### Maths HEP Lunchtime Seminars

27 October 2017 14:00 in *CM219*

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### Pure Maths Colloquium

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information

### Statistics Seminars

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information

### Stats4Grads

27 October 2017 14:00 in *CM219*

Contact david.bourne@durham.ac.uk for more information