An article in the 4/1/14 issue of  "New Scientist" indicates that photons
from the most energetic GRB to date (GRB130427A, seen on 27/4/13) have a
lag of 100s of seconds between the low and high energy rays. This is at a
redshift of 0.34 or 4.68GLyr, so plenty of scope for interacting with any
quantum foam that may be floating around.

The relevant article is here ...

On 30 October 2013 05:12, Chris de Morsella <> wrote:

> If true – ESA experimental measurements of the polarization of ranges of
> gamma rays (over a range of energies) from very distant gamma ray bursts
> that have travelled across billions of light years of spacetime to reach
> earth. Their experiments determined that spacetime does not have a granular
> structure, which would have had a measurable effect on the polarization of
> these distant gamma rays, down to a level of 10^-48 m (which is exceedingly
> small)) trillions of times smaller than the Planck scale.
> Spacetime does not appear to be granular – at least down to these
> incredibly small scales. These results have lead me to question any
> hypothesis that seems to depend on spacetime having a discreet granular
> structure.

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