Statistical and Dynamical Decoupling of the IGM from Dark Matter
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 is the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2011-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2011/492980 |
| Summary: | 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 is the difference of the nonlinear evolution of baryon fluid from that
of collisionless dark matter. In highly nonlinear regime, the cosmic baryon fluid on scale free
range evolves into the state of fully developed turbulence, of which the velocity field consists
of shocks, vortices and complex structures. This scenario provides a coherent explanation of
various phenomena referring to the statistical and dynamical decoupling of the IGM from
dark matter. |
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| ISSN: | 1687-7969 1687-7977 |