Quantum origin of dark energy and the Hubble tension
  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.
