Do we Come from a Quantum Anomaly?

Understand

We present a string-based picture of the cosmological evolution in which (CP-violating) gravitational anomalies acting during the inflationary phase of the universe cause the vacuum energy density to "run" with the effective Hubble parameter squared, $H^2$, thanks to the axion field of the bosonic string multiplet.

• This leads to baryogenesis through leptogenesis with massive right-handed neutrinos.
• The generation of chiral matter after inflation helps in cancelling the anomalies in the observable radiation- and matter- dominated eras.
• The present era inherits the same "running vacuum" structure triggered during the inflationary time by the axion field.