H_0 tension: clue to common nature of dark sector?
  The recently sharpened H_0 tension is argued not to be a result of data
calibration or other systematic but an indication for the common nature of dark
matter and dark energy. This conclusion is devised within modified weak-field
General Relativity where the accelerated expansion of the Universe and the
dynamics of galaxy groups and clusters are described by the same parameter, the
cosmological constant. The common nature of the dark sector hence will result
in intrinsic discrepancy/tension between the local and global determinations of
values of the Hubble constant.
