Found 13 result(s)
Triangular Seminar David Tong (DAMTP)
at: 15:00 room GO Jones Lecture Theatre  abstract: I'll give a basic introduction to particlevortex duality in d=2+1 dimensions and its relation to 3d bosonization. 
Regular Seminar David Tong (DAMTP, Cambridge)
at: 13:15 room S0.13  abstract: There exist, in d=2+1 dimensions, field theories that are supersymmetric but nonrelativistic. I will show that the lowenergy physics of these theories is that of the fractional quantum Hall effect. Supersymmetry provides enough analytic control to explicitly derive the ground state wavefunctions and their excitations. 
Regular Seminar David Tong (Cambridge)
at: 14:00 room H503  abstract: I'll revisit some old of ideas of Euclidean quantum gravity, in which manifolds of different topology are summed in the path integral. I'll show that, in certain circumstances, gravitational instantons can destabilise supersymmetric KaluzaKlein compactifications. We'll also see how oneloop divergences in quantum gravity can be subsumed into a new RGinvariant topological scale. 
Regular Seminar David Tong (Cambridge)
at: 14:00 room Room 208  abstract: I'll review some progress over the past 18 months in computing Ohm's law using holography. 
Regular Seminar David Tong (DAMTP, Cambridge)
at: 16:00 room CG04  abstract:

Regular Seminar David Tong (DAMTP, Cambridge)
at: 14:00 room H503  abstract: Strange metals are materials with numerous anomalous properties. The flow of electricity cannot be explained in the familiar language of a fluid of individual electrons, but instead requires a new strongly interacting description. In this talk, I will review some basic facts about these materials. With this as motivation, I will explain how to compute conductivity in certain strongly interacting, nonrelativistic field theories which are defined holographically. 
Regular Seminar David Tong (DAMTP, Cambridge)
at: 13:45 room 208  abstract:

Exceptional Seminar Neil Lambert. David Tong. ()
at: 09:00 room 1.71 of FranklinWilkins Building  abstract: Neil Lambert (KCL) 'From Dbranes to Mbranes', David Tong (DAMTP) 'Quantum vortex strings' plus several presentations by PhD students on their work. Ends at 14:15. See www.mth.kcl.ac.uk/'tilde'anderl/LMSpremeeting/ 
String Theory & Geometry Seminar David Tong (Cambridge)
at: 13:00 room IMS seminar room  abstract: As parameters in quantum mechanics are slowly varied, states undergo a nonAbelian holonomy known as Berry phase. I will review the ideas behind the Berry phase and explain how supersymmetry imposes restrictions on the holonomy. The associated nonAbelian gauge connections must obey certain first order equations which are related to the selfdual YangMills equations, specifically the Hitchin equations, tt star equations, and Bogomolnyi equations. I will end by showing how one can build a BPS 't HooftPolyakov monopole in the lab. 
Regular Seminar David Tong (DAMTP)
at: 13:15 room 423  abstract: Berry's phase is a beautiful and simple idea in quantum mechanics, with application to many areas of condensed matter physics. After reviewing the nonAbelian version of Berry's phase, I will explain how this concept naturally fits together with supersymmetry. I will then show how to compute Berry's phase in Dbrane systems, using both traditional quantum mechanics, as well as AdS/CFT techniques. 
Triangular Seminar David Tong (Cambridge)
at: 15:00 room 3B20  abstract: This talk is part of the joint Triangular Seminars. 
Regular Seminar David Tong (Cambridge)
at: 16:30 room H503  abstract: I will summarise recent progress in understanding the dynamics of vortices in gauge theories and describe how the vortices can be used as probes to extract information about the strong coupling quantum dynamics of the theory in which its embedded. 