CPT Violation and Baryogenesis
  We examine the effects on baryogenesis of spontaneous CPT violation in a string-based scenario. Under suitable circumstances, certain CPT-violating terms can produce a large baryon asymmetry at the grand-unified scale that reduces to the observed value via sphaleron or other dilution mechanisms. 
O. Bertolami, Don Colladay, V. Alan Kosteleck\'y and R. Potting