Supersymmetry in 7 and 6 dimensions, with cosmological intentions
by
Kellogg S. Stelle(Imperial College London)
→
Europe/Berlin
313
313
Description
One of the possibilities raised by brane physics constructions is to have some of the extra spacetime dimensions of relatively large size, perhaps on the micron scale, with a view towards application in the cosmological constant problem. In order to obtain models which naturally compensate for D=6 vacuum energy on a D=4 subspace, leading to flat or almost flat D=4 geometries, it is necessary to start with a gauged automorphism symmetry in the D=6 model. One class of such models was proposed by Salam and Sezgin in the 80's, but the construction of anomaly-free models of this type, especially those linked to string theory, remains to be clarified. In this talk, the problem will be addressed using a D=7 Horava-Witten construction, with particular attention to the type of bulk-boundary couplings required and the necessary classical gauge and supersymmetry noninvariances needed to compensate for quantum gauge and supersymmetry anomalies.
