Dark Matter Gas Theory: Explanation & Bullet Cluster

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SUMMARY

The discussion centers on the concept of dark matter being modeled as a gas, particularly in relation to the Bullet Cluster. It establishes that dark matter can be viewed as forming halos around galaxies and clusters, akin to atmospheres. The conversation highlights self-interacting dark matter (SIDM) as a relevant model that incorporates pressure, contrasting it with pressureless cold dark matter (CDM). A detailed review of SIDM is available at this link.

PREREQUISITES
  • Understanding of dark matter theories, specifically cold dark matter (CDM) and self-interacting dark matter (SIDM).
  • Familiarity with astrophysical structures such as galaxies and galaxy clusters.
  • Basic knowledge of fluid dynamics as it relates to astrophysical models.
  • Ability to interpret scientific literature, particularly in astrophysics.
NEXT STEPS
  • Research the implications of self-interacting dark matter (SIDM) on galaxy formation.
  • Study the Bullet Cluster and its significance in dark matter research.
  • Explore the differences between pressureless cold dark matter (CDM) and gas-like dark matter models.
  • Review the detailed analysis of SIDM provided in the paper linked in the discussion.
USEFUL FOR

Astronomers, astrophysicists, and students interested in dark matter theories, particularly those exploring alternative models to cold dark matter.

DanMP
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Do you know if there is any theory/model where dark matter is considered as a gas? Bullet Cluster suggests that dark matter travels with visible matter and forms halos around galaxies, clusters, etc. It is possible to consider these halos as dark matter atmospheres of massive objects/structures?
 
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If by gas-like you mean a fluid with pressure, as opposed to pressureless cold dark matter (CDM), then you want to look into self-interacting dark matter (SIDM). A detailed review is to be found here:
https://arxiv.org/abs/1705.02358
 
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Bandersnatch said:
If by gas-like you mean a fluid with pressure, as opposed to pressureless cold dark matter (CDM), then you want to look into self-interacting dark matter (SIDM). A detailed review is to be found here:
https://arxiv.org/abs/1705.02358
Thank you very much!
 

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