Is the Motion of Dark Matter Subhalos Random or Patterned?

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SUMMARY

The motion of dark matter subhalos within host halos is currently debated, with no definitive conclusion on whether their movement is random or follows a specific pattern. Factors influencing this motion include sensitivity to density waves and external forces such as spiral arms of galaxies and supernova blasts. The existence and nature of dark matter itself remain uncertain, complicating the understanding of subhalo dynamics. The discussion highlights the need for further research into the interactions between dark matter and its environment.

PREREQUISITES
  • Understanding of dark matter theories and concepts
  • Familiarity with galaxy dynamics and structure
  • Knowledge of gravitational interactions in astrophysics
  • Basic comprehension of density waves in astrophysical contexts
NEXT STEPS
  • Research the role of density waves in galaxy formation and dark matter distribution
  • Explore the effects of supernova explosions on surrounding dark matter
  • Investigate the concept of dark matter voids and their implications for cosmic structure
  • Study current theories and models of dark matter, including alternative hypotheses
USEFUL FOR

Astronomers, astrophysicists, and researchers interested in dark matter dynamics and galaxy formation will benefit from this discussion.

kadiliissaar
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Hi,

I know that within the host halo there are smaller subhalos moving around. I was swondering that is their motion just random motion or does it follow some kind of pattern, e.g. circular motion centred at the centre of the dark matter halo?

Thanks,
 
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This is a very good question to which, IMHO, there is not yet a clear answer. Given that we don't yet know exactly what 'Dark Matter' is, or even if there really is 'Dark Matter' rather than some non-Newtonian factor, it is hard to say.

IMHO, assuming generic 'Dark Matter', a lot depends on its sensitivity to 'density waves'. Will it be concentrated by a galaxy's spiral arms ? Will it be 'blown along' by a supernova's blast ?? Are we in a Dark Matter 'void' thanks to the 'Local Bubble' ??
http://en.wikipedia.org/wiki/Local_Bubble
 

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