Seriously, if this result holds up, it could be a sign of the relaxation of the compactification scale for an extra dimension. I doubt they can calibrate the absolute brightness, though.
The extra dimensions are usually described for nonspecialists as being "rolled up", like every point in normal space has a little (**Very** little) n-sphere attached to it.
If this is basically the idea, do you mean that the radius of the n-sphere is increasing or decreasing? As we look at things further and further away, the radius is larger or smaller?
I guess at the big Bang itself, all dimensions were restricted to the same size, whatever that could mean?
I doubt they can calibrate the absolute brightness, though.
The article didn't say how they estimated the distance to these bursts. Are they correlated with visible galaxies?