Quantum origin of dark energy and the Hubble tension

TL;DR

This paper proposes that dark energy originating from inflationary quantum fluctuations can reduce the Hubble tension, and upcoming missions like Euclid can test this hypothesis.

Contribution

It introduces a novel scenario where inflationary quantum fluctuations influence dark energy, potentially resolving the Hubble tension.

Findings

Quantum fluctuations can influence dark energy.

Spatial correlations from inflation can reduce Hubble tension.

Upcoming missions can test these predictions.

Abstract

Local measurements of the Hubble parameter obtained from the distance ladder at low redshift are in tension with global values inferred from cosmological standard rulers. A key role in the tension is played by the assumptions on the cosmological history, in particular on the origin of dark energy. Here we consider a scenario where dark energy originates from the amplification of quantum fluctuations of a light field in inflation. We show that spatial correlations inherited from inflationary quantum fluctuations can reduce the Hubble tension down to one standard deviation, thus relieving the problem with respect to the standard cosmological model. Upcoming missions, like Euclid, will be able to test the predictions of models in this class.