North British Mathematical Physics Seminar 30

The thirtieth meeting of the North British Mathematical Physics Seminar took place on Friday 10th June 2011 at the University of York. These people participated.

We have a new location: the King's Manor. This is in the centre of the city, 5 minutes' walk from the railway station, and, we hope, will make coming to York NBMPS by rail much more convenient.

To get there, turn left out of the station, under the wall, left over the bridge over the river, then left after 100m at the crossroads (see map). The King's Manor is in Exhibition Square, to the left of the city art gallery.

Refreshments and lunch will be in the refectory (paying individually): go through the porters' lodge and up the stone staircase towards the end of the first court on the left. Talks will be in the 1960s building (which hosts the Department of Archaeology) beyond the second court: go up either external staircase and it's K/159, at the right-hand end of the first-floor corridor.


Veronika Hubeny (Durham)
Relativistic Beaming in AdS/CFT
This talk is cast within the context of AdS/CFT, in particular the relation between the radiation produced by accelerating quark at the boundary, and the motion of a fundamental string in the bulk AdS spacetime. We propose a mechanism whereby a string source deep in bulk of AdS nevertheless induces highly localized energy density in the boundary CFT, which simultaneously provides a simple technique for computing the radiation.
Richard Szabo (Heriot-Watt)
Crystals, instantons and quantum geometry
Leon Loveridge (York)
Quantum measurements and conservation laws
The Wigner-Araki-Yanase (WAY) theorem demonstrates that perfectly accurate and repeatable measurements cannot be realised for an observable that does not commute with an additive conserved quantity of the system and apparatus. However, the proof only incorporates a limited class of observables and conserved quantities. I shall review this work, provide some small extensions and discuss new work on the important case of position measurements subject to momentum conservation, which is not covered by the original theorem. These results can be used to answer an old question posed by Stein and Shimony.
John Barrett (Nottingham)
State sum models, induced gravity and the spectral action
A proposal that the bosonic action of gravity and the standard model is induced from the fermionic action is investigated. It is suggested that this might occur naturally in state sum models. arXiv:1101.6078
Prince Koree Osei (University of Ghana / Heriot-Watt)
Semiduality and quantisation ambiguities in 3d gravity
In the combinatorial quantistation approach to 3d gravity one needs to find a classical r-matrix which is compatible with the classical theory, in a suitable sense. In some cases, several classical r-matrix are compatible with a given classical action, leading to an apparent ambiguity in the quantisation. In this talk I will describe and classify these ambiguities, and relate them to the concept of semiduality of Hopf algebras.

Practical Information

This is the map to get you from the railway station to King's Manor (the university-provided one doesn't show the station).

If you come by car I'm afraid you'll need to take your chances in the city centre car parks.

Limited funds are available to help with travel expenses of those with no other source of funding, especially postgraduate students and postdocs. Please book early to take advantage of the cheaper advance-purchase train fares. For how to claim please see the main NBMPS page.

If you wish to attend the meeting, or for further questions, please email the local organisers:

Niall MacKay or Eli Hawkins.