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It is supposed that most of this matter is in the form of Dark Matter. If GR and LQG are correct, then it follows that Dark Matter is indeed responsible for the expansion of the universe and that Dark Energy is really just a passive property of space.

How can that be??? Well, we know that space is expanding at an accelerating rate. Since it incorporates an increasing amount of Dark Energy, it is tempting to assume that the acceleration is a linear effect of increasing amounts of Dark Energy. But if the gravitational field is dependent only on mass, not energy, assuming that Dark Energy has no mass-- and if GR and LQG are correct-- then universal expansion must an as yet unknown nonlinear effect of Dark Matter. Is my logic faulty?

Any theory that makes such a prediction would be falsifiable. But it would not be a true prediction as there is already evidence of an accelerating expansion. In fact, it should be relatively easy to invent models, if not theories, that make such predictions- apparently not so.

I have seen papers on arXiv.org that claim Dark Energy is derived from Dark Matter, but not any that attribute universe expansion to Dark Matter. Rather the linear effects of Dark Matter would cause universe contraction. It is said to be responsible for galaxy formation, clusters of galaxies and super clusters. So the linear effects dominate up to super cluster scales.

The nonlinear effects may holistic on the scale of the universe, such as can be understood by particular values of the cosmological constant. Is the cosmological constant related to nonlinear effects of Dark Matter? Is this question valid?

I have not seen any such theory; but I have seen solutions to the equations of GR on arXiv.org (Hamilton, etal. http://www.arxiv.org/abs/gr-qc/0411062) that predict space creation as a function of mass inflation. It happens in charged black holes where physical (baryonic) charged matter is repelled by the central (singularity) charge and is flowing outward in the black hole. When that physical flow encounters Dark Matter being absorbed by the black hole, new space is created as the physical matter passes through the Cauchy horizon.

This GR solution predicts that the smaller the amount of Dark Matter absorbed, the larger is the inflation of the physical mass flow, a nonlinear effect. If the created space were still in our universe, perhaps in some holistic sense, then that would be a nonlinear mechanism for space expansion from Dark Matter. I have no idea how this might relate to the comic constant.