[nchagnet]

The title of the phys.org article is a bit more misleading than the article itself (when are they not).

What the authors did is build a unified setup for classical gravity and electromagnetism as the solution of one action, under specific assumptions (Weyl geometry, etc...). Usually we consider gravity as the curvature of spacetime, and electromagnetic forces as the curvature of the electromagnetic field. The authors built something elegant where you can get both in one go.

What this work doesn't do is as important as what it does given the "ambitious" title. The authors' work is interesting, but a casual interpretation of the title would really mislead people into thinking they solved the unification problem.

This work doesn't address other forces or the general particularities of the standard model and how they would also bundle. The second thing it doesn't answer is how to quantize any of these fields (gravity is notoriously difficult to quantize for many reasons).

[floxy]

What would be a better title? "Unifying gravity and electromagnetism in a classical theory"?

[nchagnet]

That'd be a good start. This article is well anchored within geometrodynamics (the theories which attempt to explain all physics as geometry), so maybe making that clear would avoid confusions already.