Has cosmological dark matter been observed?

We present evidence supporting a model in which the cosmological dark matter corresponds to a scalar field, which can be “seen”, however indirectly, in the oscillation of the effective gravitational constant, and manifests itself in the periodicity of the number density distribution of galaxies observed by Broadhurst et al. [T. Broadhurst, R. Ellis, D. Koo and A. Szalay, Nature 343 (1990) 726]. A numerical analysis shows that the model successfully passes all cosmological tests, a fact that lends support to the conclusion that ≈ 98% of the energy density of the Universe is stored in this scalar field. This suggests that, if the observations of the galactic periodicity are not a statistical fluke, the cosmological component of dark matter might already have been observed.