  In this paper we consider the Universe at the late stage of its evolution and
deep inside the cell of uniformity. At these scales, the Universe is filled
with inhomogeneously distributed discrete structures (galaxies, groups and
clusters of galaxies). Supposing that a small fraction of colored objects
escaped hadronization and survived up to now in the form of quark-gluon nuggets
(QNs), and also taking into account radiation, we investigate scalar
perturbations of the FRW metrics due to inhomogeneities of dustlike matter as
well as fluctuations of QNs and radiation. In particular, we demonstrate that
the nonrelativistic gravitational potential is defined by the distribution of
inhomogeneities/fluctuations of both dustlike matter and QNs. Consequently, QNs
can be distributed around the baryonic inhomogeneities (e.g., galaxies) in such
a way that it can solve the problem of the flatness of the rotation curves. We
also show that the fluctuations of radiation are caused by both the
inhomogeneities in the form of galaxies and the fluctuations of quark-gluon
nuggets. Therefore, if QNs exist, the CMB anisotropy should contain also the
contributions from QNs. Additionally, the spatial distribution of the radiation
fluctuations is defined by the gravitational potential. All these results look
physically reasonable.
