Late baryogenesis in a two-brane universe with a latent C/CP violation

Abstract

We introduce a toy model of baryogenesis where our usual visible Universe is a 3-brane coevolving with a hidden 3-brane in a multidimensional bulk, in an ekpyrotic-like approach. The visible matter and antimatter sectors are coupled with the hidden matter and antimatter sectors, breaking the C/CP invariance and leading to baryogenesis occurring after the quark-gluon era. The issue of leptogenesis is also discussed. This model complements cosmological approaches in which dark matter and dark energy could naturally emerge from many-brane scenarios.

Comments: The authors have withdrawn the paper (arXiv:2304.07243) because it has been merged with another complementary paper (arXiv:2307.10637) to enhance consistency and clarity. The full paper is now available under arXiv:2307.10637 as a result of this merger