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A universal constant for dark matter-baryon interplay.

Man Ho Chan1

  • 1Department of Science and Environmental Studies, The Education University of Hong Kong Tai Po, New Territories, Hong Kong, China. chanmh@eduhk.hk.

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Researchers found a universal dark matter-baryon relation applicable to both galaxies and galaxy clusters. This new scale-independent constant (K) could help solve the small-scale dark matter problem.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Galaxy Formation and Evolution

Background:

  • Existing dark matter scaling relations and baryon connections are primarily observed in galaxies, not galaxy clusters.
  • A gap exists in understanding the interplay between dark matter and baryons across different cosmic structures.

Purpose of the Study:

  • To introduce and validate a novel expression for characterizing dark matter-baryon interplay.
  • To establish a universal relation applicable to both galactic and galaxy cluster scales.

Main Methods:

  • Utilized archival observational data from both galaxies and galaxy clusters.
  • Analyzed the relationship between average dark matter density, average baryon density, characteristic velocity, and interacting volume.

Main Results:

  • Discovered a scale-independent constant value, K, within the optical radius (ro).
  • This constant (K) represents a universal dark matter-baryon interplay applicable across galactic and galaxy cluster scales.

Conclusions:

  • The identified universal relation is the first of its kind for dark matter-baryon interactions.
  • This finding may provide a foundation for addressing the small-scale dark matter problem and galaxy scaling relations.
  • The discovered constant K suggests a potential underlying global interaction between dark matter and baryons.