Baryogenesis with four-fermion operators in low-scale models

Abstract

We describe a nonstandard proposal for baryogenesis in models with a low (O(10-100)TeV) fundamental scale. The scenario has Standard Model field content and enhanced baryon number violating operators deriving from time-dependent fermion localization in an extra dimension. The CKM matrix provides sufficient CP violation. The major constraints are the low reheating temperature and rate of perturbative B-violating reactions compared to the total entropy created. A sufficient baryon fraction may arise, but the cosmological evolution required is likely to be somewhat contrived. Based on work in collaboration with D.J.H. Chung.

10 pages latex, graphicx + amssymb, 2 figures. Talk presented at M-Theory Cosmology conference, August 2001, Cambridge (UK), also contributed to Erice ISSP '01 Proceedings, "New Fields and Strings in Subnuclear Physics". v3: references added