Super-horizon second-order perturbations for cosmological random
  fluctuations and the Hubble-constant problem
  The super-horizon second-order density perturbations corresponding to
cosmological random fluctuations are considered, their non-vanishing spatial
average is shown to be useful in solving the serious problem on the
cosmological tension between measured Hubble constants at present and those at
the early stage, and the difference from previous works on the backreaction is
discussed.
