The second string (phenomenology) revolution
Abstract
Over the past three years our views on how the standard model of particle theory could be embedded into string theory have changed dramatically. The heterotic string is no longer the only possibility for such an embedding and other perturbative (or nonperturbative) corners of Mtheory, like type I or II strings, now seem possible. It has also been realized that the string scale M_{s} is not necessarily close to the Planck scale and could be much smaller, of the order of the intermediate scale (M_{W} M_{p} )^{1/2} , or even close to the weak scale. In addition, semirealistic threegeneration models have recently been constructed starting with type IIB compact orientifolds. I briefly discuss all of these developments which represent a revolution in our understanding of string phenomenology.
 Publication:

Classical and Quantum Gravity
 Pub Date:
 March 2000
 DOI:
 10.1088/02649381/17/5/321
 arXiv:
 arXiv:hepph/9911499
 Bibcode:
 2000CQGra..17.1117I
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 15 pages, Latex file, no figures. Contribution to the proceedings of Strings 99, Potsdam (Germany), July 1999