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Atomic dark matter (aDM) is a hypothetical form of dark matter (DM) that it consists of particles that have some kind of interaction among themselves (self-interacting dark matter) reminiscent of the known interactions of sub-atomic particles in baryonic matter. (The term is not generally used for dark matter presumed made of actual atoms: it is better described as dark matter particles presumed to form their own kind of compound particles analogous to the way atoms are formed out of subatomic particles.) The aDM concept is of interest because some variant might avoid known problems with cold dark matter (CDM), such as the sigma-8 tension. Associated with the unknown interaction between aDM particles would be associated EMR-like radiation (dark radiation or DR, consisting of dark photons). The simplest such theories would include particles analogous to the electron and proton (dark electron and dark proton), each with its own mass and the two with opposing charges of some as-yet-unknown type.