Another interesting new theory that attempts to explain Dark Matter and Dark Energy, as well as linking GR and Quantum Theory:

Nexus Theory Article

Nexus Theory Paper

Any comments?

It's a "fun enough" idea. Trying to explain both dark matter and dark energy as two parts of the same process. I'm all for other contenders trying to bridge the QM-GR gap.

The paper said:

This makes each elementary displacement four vector a vibrating spin 2 particle. This elementary spin 2 excitation of space-time must be a graviton. Consequently, spacetime is a superposition of gravitons just as the Electromagnetic field is a superposition of photons.

Never really thought of an EM field being a superposition of photons.

The paper's actually pretty interesting, though the coincidence of numbers (e.g. getting that close to the cosmological constant?) seems suspicious ;)