A common explanation of the Hubble tension and anomalous cold spots in
  the CMB
  The standard cosmological paradigm narrates a reassuring story of a universe
currently dominated by an enigmatic dark energy component. Disquietingly, its
universal explaining power has recently been challenged by, above all, the
$\sim4\sigma$ tension in the values of the Hubble constant. Another, less
studied anomaly is the repeated observation of integrated Sachs-Wolfe imprints
$\sim5\times$ stronger than expected in the $\Lambda$CDM model from R>100
$Mpc/h$ super-structures. Here we show that the inhomogeneous AvERA model of
emerging curvature is capable of telling a plausible albeit radically different
story that explains both observational anomalies without dark energy. We
demonstrate that while stacked imprints of R>100 $Mpc/h$ supervoids in cosmic
microwave background temperature maps can discriminate between the AvERA and
$\Lambda$CDM models, their characteristic differences may remain hidden using
alternative void definitions and stacking methodologies. Testing the extremes,
we then also show that the CMB Cold Spot can plausibly be explained in the
AvERA model as an ISW imprint. The coldest spot in the AvERA map is aligned
with multiple low-$z$ supervoids with R>100 $Mpc/h$ and central underdensity
$\delta_{0}\approx-0.3$, resembling the observed large-scale galaxy density
field in the Cold Spot area. We hence conclude that the anomalous imprint of
supervoids may well be the canary in the coal mine, and existing observational
evidence for dark energy should be re-interpreted to further test alternative
models.
