Baryogenesis from a Modulus Dominated Universe

Understand

String/ M-theory compactifications predict the existence of a modulus field with a mass of 100-10000 TeV.

• Its decay at MeV-temperatures generates large amounts of entropy and washes out any previously produced baryon asymmetry.
• We describe how the baryon asymmetry can be (re)generated by the modulus decay.
• The mechanism relates the smallness of the asymmetry to the hierarchy between the Planck- and the Fermi-scale.