Limits to Seeing High-Redshift Galaxies Due to Planck-Scale-Induced
  Blurring
  In the last decade or so there has been debate over the possibility that the
fuzzy quantum nature of spacetime might decohere wavefronts emanating from very
distant sources. Consequences of that could be "blurred" or "faded" images of
compact structures in galaxies, primarily at z>1 for their emitted X-rays and
gamma-rays, but perhaps even in ultraviolet through optical light at higher
redshift. So far there are only inconclusive hints of this from z~4
active-galactic nucleii and gamma-ray bursts viewed with Fermi and Hubble Space
Telescope. If correct though, that would impose a significant, fundamental
resolution limit for galaxies out to z~8 in the era of the James Webb Space
Telescope and the next generation of ground-based telescopes using adaptive
optics.
