A cosmological pathway to testable leptogenesis

Abstract

Leptogenesis could have occurred at temperatures much lower than generally\nthought, if the cosmological history of the Universe underwent a period of\naccelerated expansion, as is predicted for example in a class of scalar-tensor\ntheories of gravitation. We discuss how non-standard cosmologies can open new\npathways for low scale leptogenesis. Within these scenarios, direct tests of\nleptogenesis could also provide information on the very early times Universe\nevolution, corresponding to temperatures larger than the TeV.\n