DAVID BAILIN

Centre for Theoretical Physics, University of Sussex, Brighton BN1 9QJ, UK

Email: d.bailin@sussex.ac.uk

Abstract. I briefly outline previous work on getting the (supersymmetric) standard model from string theory, and then describe two ecent attempts using D-branes. The first uses D3- and D7-branes and gives a supersymmetric standard model with extra vector-like matter and an intermediate unification scale. The second uses intersecting D4-branes and yields a non-supersymmetric spectrum with TeV-scale unification.

Keywords. Standard; D-branes.

PACS Nos 11.25; 12.60