[tylerjwilk00]

Not a physicist, but I've been quietly hoping something like this was the case for years and would usurp Dark Matter as the reason for rotational anomaly at the outer galactic edges.

It makes sense that space-time is both attractive or repulsive based on the presence or absence matter. Throw in an overlapping inverse square law at the galactic boundary and perhaps this solves the anomaly by way of a steep gravity wall where attractive and repulsive forces meet.

Again, not a physicists either, but I agree, it seems to make sense spatially.