A long-range fifth force coupled to dark matter can induce a coupling to
ordinary matter if the dark matter interacts with Standard Model fields. We
consider constraints on such a scenario from both astrophysical observations
and laboratory experiments. We also examine the case where the dark matter is a
weakly interacting massive particle, and derive relations between the coupling
to dark matter and the coupling to ordinary matter for different models.
Currently, this scenario is most tightly constrained by galactic dynamics, but
improvements in Eotvos experiments can probe unconstrained regions of parameter
space.Comment: 4 page