We led you here under false pretences!
We have proposed that there is no unified field (as it is defined in quantum mechanics) that handles charge and gravitation on the same basis. For extra controversy, we wrote this in a paper in a volume entitled, "Unified Field Mechanics".
We proposed a deterministic mechanism, where the system is a set of isomorphic entities, that have a trigger for localisation. Some entities are conserved by collapsing repeatedly within the same locality - what we call "matter". However, an instance of this collapsed matter, a fermion, we compose using two bosonic components. These bosons, whose propagation defines time (thereby always propagating at light speed), can be thought of as 'partial matter in flight', and we propose that the vacuum is 'filled' with a flux of these bosons.
This flux can be interpreted as gravitational or charge-based, but only at a classical scale, where the deterministic mechanism emerges into concepts like 'conserved particles' and 'fields' only through statistics that lose a lot of information about the originating process.
It is helpful to think of this in terms of:
Our mechanism implicitly includes gravitation and charge-based forces (weak, strong, electric), without explicitly formulating them into abstract dimensions. Likewise, quanta are not inherently ‘electric’, ‘magnetic’, nor ‘gravitational’; their observed effect depends on the context and attribution of quanta to their structured sources.