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Paper   IPM / P / 17236
School of Physics
  Title:   Dark Matter Cosmology with Varying Viscosity: a Possible Resolution to the S_8 Tension
1.  A. Ashoorioon
2.  Z. Davari
  Status:   Published
  Journal: Astrophys. J
  No.:  2
  Vol.:  959
  Year:  2023
  Pages:   120
  Supported by:  IPM
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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