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The bulk viscosity is introduced to model the current observational cosmos and the unified dark
matter (dark matter and dark energy). The viscous unified model assumes that the universe is filled
with a single nonperfect fluid with a bulk viscosity. We review the general framework for the...
Although the gravitational field in the universe is dominated by dark matter, cosmological
observations show that the statistical properties of cosmic baryonic matter are significantly
and systematically decoupled from that of the underlying dark matter. The dynamical
reason of the decoupling...
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