A Description of Dark Matter and an Explanation for Five or Six Observed Ratios of Dark Matter Effects to Ordinary Matter Effects

We suggest a well-specified description for dark matter. We use the description to explain five or six observed ratios of dark matter to ordinary matter. Ratios (plus phenomena and bases) include 5+:1 (densities of the universe, CMB {cosmic microwave background} analysis); 5+:1 (densities in some galactic clusters, gravitational lensing); 4-:1 (recent densities in some galaxies, gravitational lensing); 0+:1 (early densities in some galaxies, rotation curves); ~1000:1 (densities in a dark matter galaxy, starlight); and possibly 1:1 (hydrogen hyperfine interactions, CMB analysis). Steps toward the explanation include the following. Develop a mathematics-based framework for cataloging elementary particles, augmenting quantum field theory, and embracing classical and quantum kinematics theories. Develop an elementary-particle analog to the periodic table. Predict new elementary and hadron-like particles. Re-express and unify electromagnetism and gravity. Describe dark matter. (We suggest that nature embraces six copies of an expanded Standard Model particle set. Five copies correlate with dark matter. Regarding the sixth copy, most stuff measures as ordinary matter and some new hadron-like particles measure as dark matter.) Provide a theory of galaxy evolution. Explain the ratios.