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| Paper IPM / P / 17236 |
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We study varying forms of viscous dark matter and try to address the intriguing tensions of the standard model of cosmology with the recent cosmological data, including the Hubble and S_8 tensions. We note that assuming the dark matter viscosity depends on the Hubble parameter, dark matter density, or both, one can improve the statistics. Although the models tend to aggravate the Hubble tension a bit, they tend to reduce the S_8 tension, even in comparison with the constant viscosity case.
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