Matter-Antimatter Asymmetry Induced by a Running Vacuum Coupling
  We show that a CP-violating interaction induced by a derivative coupling
between the running vacuum and a non-conserving baryon current may dynamically
break CPT and trigger baryogenesis through an effective chemical potential. By
assuming a non-singular class of running vacuum cosmologies which provides a
complete cosmic history (from an early inflationary de Sitter stage to the
present day quasi-de Sitter acceleration), it is found that an acceptable
baryon asymmetry is generated for many different choices of the model
parameters. It is interesting that the same ingredient (running vacuum energy
density) addresses several open cosmological questions/problems: avoids the
initial singularity, provides a smooth exit for primordial inflation,
alleviates both the coincidence and the cosmological constant problems, and,
finally, is also capable of explaining the generation of matter-antimatter
asymmetry in the very early Universe.
