Found 4 result(s)

23.11.2016 (Wednesday)

SEMINAR CANCELLED

Regular Seminar Paul Townsend (Cambridge)

at:
14:00 IC
room H503
abstract:

The N-extended massless superparticle in a 4D Minkowski background has a worldline time-reversal invariance that becomes CPT in the quantum theory. This symmetry is anomalous for odd N, which explains why there is no CPT-self-conjugate massless supermultiplet for N=1. In the supertwistor formulation of superparticle mechanics, the anomaly is a close cousin of the parity anomaly of 3D gauge theories. CPT is not anomalous if N is even but if 2N is odd there is a Kramers degeneracy, which explains why the N=2 hypermultiplet is a doubled version of the CPT-self-conjugate supermultiplet of helicities (-1/2,0,0,1/2).

10.02.2010 (Wednesday)

Massive 3D supergravities

Triangular Seminar Paul Townsend (DAMTP, Cambridge)

at:
17:00 QMW
room PP1 Peoples Palace
abstract:

Non-zero mass is compatible with unbroken gauge invariance in three spacetime dimensions (3D). A systematic procedure for the construction of massive gauge theories will be illustrated by new massive gravity, which propagates unitarily two massive spin 2 modes in a Minkowski vacuum. The supergravity extension of this model will be presented along with new results on supersymmetric AdS vacua. The extension to a new N=8 3D supergravity will be discussed, as will be the AdS3CFT2 correspondence and possible connections to string/M-theory.

07.02.2007 (Wednesday)

Stability and Susy, fake and pseudo

Regular Seminar Paul Townsend (University of Cambridge)

at:
13:15 KCL
room 423
abstract:

09.03.2005 (Wednesday)

The Jacobi principle and cosmological singularities

Regular Seminar Paul Townsend (DAMTP)

at:
13:45 KCL
room 423
abstract: