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Exchange symmetry and anyon virial coefficients

Series
Oxford Physics Academic Lectures
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This talk mentions some aspects of the theory of identical particles, for example, treating neutrons and protons as identical particles distinguished by a quantum number called isotopic spin.
He will also review studies of systems of three or more anyons. In particular, the virial expansion shows that the free anyon gas approximates exclusion statistics, with a correspondence between the anyon parameter and the exclusion parameter which is different from the case of anyons in a magnetic field, discussed in the talk by Jon Magne Leinaas.

Episode Information

Series
Oxford Physics Academic Lectures
People
Jan Myrheim
Keywords
anyon
exclusion
neutrons
quantum
Department: Department of Physics
Date Added: 11/10/2016
Duration: 01:07:27

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Exchange statistics - Basic concepts

Series
Oxford Physics Academic Lectures
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In this talk Jon Magne Leinaas from University of Oslo reviews some of the basic ideas and questions related to the exchange symmetry of identical particles.
This talks begins with discussing the braid description of particle exchange and some of the interesting question this raises with respect to geometry and topology. A particularly interesting question is whether the geometric understanding of particle exchange means that the spin-statistics theorem can be given a purely geometric formulation. Even if that so far has not been done, the correct relation between spin and statistics seems in some ways natural from the geometric point of view, as he will discuss. In the last part he will focus on the dynamics of systems of anyons in condensed matter systems, where the physical space has the character of a phase space rather than a configuration space. A semi-classical description is discussed, where the anyon parameter is coupled to an exclusion effect, which in the quantum description is known as exclusion statistics.

Episode Information

Series
Oxford Physics Academic Lectures
People
Jon Magne Leinaas
Keywords
geometry
topology
spin
statistics
particle
exchange
quantum
exclusion
Department: Department of Physics
Date Added: 11/10/2016
Duration: 01:18:26

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Local communities: first and last providers of protection (Forced Migration Review 53)

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Local communities: first and last providers of protection (Forced Migration Review 53)
It is often people’s immediate community that provides the first, last and perhaps best tactical response for many people affected by or under threat of displacement. In the 23 feature theme articles in this issue of FMR, authors from around the world – including authors who are themselves displaced – explore the capacity of communities to organise themselves before, during and after displacement in ways that help protect the community. See more at http://www.fmreview.org/community-protection.html.

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CNS remyelination: from mechanisms to medicines

Series
Nuffield Department of Clinical Neurosciences
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NDCN Departmental Seminar

Episode Information

Series
Nuffield Department of Clinical Neurosciences
People
Robin Franklin
Keywords
neuroscience
Department: Nuffield Department of Clinical Neurosciences
Date Added: 07/10/2016
Duration: 00:48:07

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Dark Matter(s) Discussion

Series
The Physics of Fine-Tuning
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Celine Boehm, Rocky Kolb, and Justin Read discuss fine-tuning in dark matter models, how we judge astrophysical parameters to be fine-tuned, how we get evidence for dark matter, supersymmetry, and our prospects for finding the dark matter particle.
This discussion was conducted at the Dennis Sciama Theatre at the Denys Wilkinson Building, Oxford, on September 8, 2016.

Episode Information

Series
The Physics of Fine-Tuning
People
Celine Boehm
Rocky Kolb
Justin Read
Keywords
fine-tuning
Physics
science
philosophy of science
astronomy
dark matter
Department: Department of Physics
Date Added: 04/10/2016
Duration: 00:18:55

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The Level of Fine-Tuning it Takes to Make a Dark Matter Model

Series
The Physics of Fine-Tuning
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Dr. Celine Boehm (Durham) discusses the possible dark matter particles and the constraints--theoretical and experimental--on their parameter space.
This lecture was conducted at the Dennis Sciama Theatre at the Denys Wilkinson Building, Oxford, on September 8, 2016.

Episode Information

Series
The Physics of Fine-Tuning
People
Celine Boehm
Keywords
fine-tuning
Physics
science
philosophy of science
astronomy
dark matter
Department: Department of Physics
Date Added: 04/10/2016
Duration: 00:41:40

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The Decade of the Wimp

Series
The Physics of Fine-Tuning
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Dr. Rocky Kolb (Chicago) discusses the theoretical reasons to expect dark matter to be a Weakly Interacting Massive Particle (WIMP), and the prospects for finding one.
This lecture was conducted at the Dennis Sciama Theatre at the Denys Wilkinson Building, Oxford, on September 8, 2016.

Episode Information

Series
The Physics of Fine-Tuning
People
Rocky Kolb
Keywords
fine-tuning
Physics
science
philosophy of science
astronomy
dark matter
Department: Department of Physics
Date Added: 04/10/2016
Duration: 00:49:13

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Astrophysical Probes of Dark Matter

Series
The Physics of Fine-Tuning
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Dr. Justin Read (Surrey) explains the astrophysical evidence for dark matter, and our prospects for getting more information about its nature and interaction by looking at nearby dwarf galaxies.
This lecture was conducted at the Dennis Sciama Theatre at the Denys Wilkinson Building, Oxford, on September 8, 2016.

Episode Information

Series
The Physics of Fine-Tuning
People
Justin Read
Keywords
fine-tuning
Physics
science
philosophy of science
astronomy
dark matter
Department: Department of Physics
Date Added: 04/10/2016
Duration: 00:44:28

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Optimization (3.3)

Series
Scientific Computing for DPhil Students
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In this lecture, Professor Trefethen discusses NEOS and COIN-OR, constraints and linear programming, and quadratic programming and linear constraints.
Creative Commons Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK (BY-NC-SA): England & Wales; https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
Scientific Computing for DPhil Students
People
Nick Trefethen
Keywords
scientific computing
numerical analysis
linear algebra
optimization
Department: Mathematical Institute
Date Added: 03/10/2016
Duration:

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Optimization (3.2)

Series
Scientific Computing for DPhil Students
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In this lecture, Professor Trefethen discusses Newton's methods for minimizing a function of several variables. He then moves on from Newton's method to practical optimization.
Creative Commons Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK (BY-NC-SA): England & Wales; https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
Scientific Computing for DPhil Students
People
Nick Trefethen
Keywords
scientific computing
numerical analysis
linear algebra
optimization
Department: Mathematical Institute
Date Added: 03/10/2016
Duration:

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