Undergrad What is the difference between collisionless and self-interacting dark matter?

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SUMMARY

The discussion clarifies the distinction between collisionless dark matter and self-interacting dark matter (SIDM). Collisionless dark matter, as described by the Lambda Cold Dark Matter (LCDM) theory, implies no physical scattering or significant non-contact interactions beyond gravitational effects. In contrast, SIDM allows for interactions between dark matter particles, which can influence structure formation in the universe. This fundamental difference impacts theoretical models and simulations in cosmology.

PREREQUISITES
  • Understanding of Lambda Cold Dark Matter (LCDM) theory
  • Familiarity with self-interacting dark matter (SIDM) concepts
  • Basic knowledge of gravitational interactions in astrophysics
  • Awareness of cosmological simulations and their relevance
NEXT STEPS
  • Research the implications of SIDM on galaxy formation and structure
  • Explore current simulations that incorporate SIDM models
  • Study the observational evidence supporting LCDM and SIDM theories
  • Investigate the role of dark matter in the cosmic microwave background (CMB)
USEFUL FOR

Astronomers, cosmologists, and astrophysics students interested in dark matter research and its implications for the universe's structure and evolution.

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When dark matter is called collisionless, does it only mean that they do not collide and scatter, or does it also mean that there is no other significant non-contact interaction?
 
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That would be the LCDM theory of dark matter.
I would think collisionless means no physical scattering, no interaction whatsoever, except through gravity.
But let us have a second opinion before you send off.
Keep you finger on the keyboard.

There is also the SIDM - self interacting dark matter.
 

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