The primary candidate for dark matter is the neutralino. The superpartners of the Z boson (zino), the photon (photino) and the neutral higgs (higgsino) have the same quantum numbers. This means these superparnters can mix, such as in a condensate, to form four eigenstates of the mass operator called "neutralinos". This system is similar to the K-Kbar system Feynman writes about in his lectures, though the mass matrix is a bit more complex. Then of course there are the other super partners, such as s-quarks and s-leptons. Dark matter might in fact compose a whole "zoo" of particles that form a whole dark world which couples to our known world most strongly by gravitation.
There is for the Cl_8 group 256 dimensions with 9-grading for spins in a cycle of -2, -3/2, -1, -1/2, 0, 1/2, 1. 3/2, 2, which appears as
1 + 8 + 28 + 56 + 70 + 56 + 28 + 8 + 1 = 1 + 8 + 28 + 56 + (35+35) + 56 + 28 + 8 + 1, which predict eight Rarita-Schwinger fields and a single graviton. E_8 has a 7-grading 8 + 28 + 56 + 64 + 56 + 28 + 8, where the graviton sector and the scalar and pseudo-scalar fields are removed. The extra-octonionic graded structure 1,0,0,0,3+3,0,0,0,1 indicate that the graviton and the scalars (Higgs & dilaton) are derived elsewhere. Yet in this way the Clifford-8 can embed the exceptional E_8. That the graviton and scalars are not independent in E_8 is why there is the extended CL_{16) system, which embeds E_8xE_8, where now the graviton is due to two copies (in string theory interpreted as due to the handedness of the fields on a closed string) .
In particular, in the J^3(O) the two E_8s are related to each other by the "point" corresponding to one octonion, are dual to lines in OP^2, which are themselves OP^1 --- 7 dimensional spaces. The holonomy for the 7-sphere is the G_2 group, which is centralized with respect to F_4 in E_8. The duality here then describes a graded system on O^2 with dual 8_vx8_s representations. This is then one reason why octonionic gravitation involves the F_4 transformation of the octonionic group which diagonalizes the Jordan exceptional algebra. The action of the F_4 and G_2 groups I indicate in the attached jpg file.
BTW, this is one problem with the Lisi program. The graviton was assumed to be framed with the electroweak interactions. Yet the gauge interactions are internal symmetries, while gravitation is an external symmetry. The intertwining of them is through supersymmetric transformations and the graded structure over Lie algebras.
Anyway back to the issue of dark matter, it is likely a consequence of supersymmetry. Even your structures have these additional fields, some which you label as SUSY pairs. In this we may have a whole classification of structures with masses ranging from the low range of ~ 1TeV for the neutralino to 10^6TeV for SUSY partners for T-quarks. These are extremely weakly interacting fields, and proposals to detect them directly have given null results. The Fermi spacecraft and PAMELA detector have detected some statistically significant production of gamma rays from a weak decay (slow decay rate) of neutralinos, though some controversy exists over these results. Last month I read a physics short about sapphire detectors meant to find the presence of dark matter. There is an ongoing mine shaft experiment in Italy which employs supercold crystalline material which might vibrate in response to a neutralino.
Lawrence B. CrowellAttachment #1: octonionic_curved_space.JPG