Old Puzzles
Abstract
In this talk I first briefly review how far we have come in answering old questions about the most fundamental building blocks of matter. I begin with things we know, which is the Standard Model, and then talk about things we can guess, which is superstring theory. After this review I discuss a key point at which our understanding of superstring theory presently stops: the problem of supersymmetry breaking and the cosmological constant. I explain in which direction I imagine a way out. This way out predicts gravitinos and dilatons with masses of order millieV.
 Publication:

arXiv eprints
 Pub Date:
 July 2002
 DOI:
 10.48550/arXiv.hepth/0207203
 arXiv:
 arXiv:hepth/0207203
 Bibcode:
 2002hep.th....7203S
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory