On the Hubble expansion in a Big Bang quantum cosmology

Understand

The Hubble expansion of the Universe is considered in the classical limit of a Big Bang quantum cosmology.

• In an IR-consistent coupling to the the bare cosmological constant, we infer a dark energy as a relic of the Big Bang by loss of time-translation invariance on a Hubble time-scale.
• This dark energy is identified with the trace $J$ of the Schouten tensor permitting an analytic solution $H(z)$.
• Anchored by the {\em Baryonic Accoustic Oscillations}, $J$CDM predicts a Hubble constant $H_0=\sqrt{6/5}\,H_0^\Lambda$ alleviating $H_0$-tension between the Local Distance Ladder and $H_0^\Lambda$ in $\Lambda$CDM, whose dark energy $\Lambda$ is a constant.