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Person perception is influenced by both external behaviors and the observer’s internal characteristics, including personality traits. Individuals with dark personality traits, comprising psychopathy, Machiavellianism, and narcissism — collectively known as the dark triad – exhibit manipulative and exploitative tendencies in social contexts. These traits affect how they perceive others and how they are perceived.The Role of Dark Personality Traits in Person PerceptionBlack et...
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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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Light/dark Transition Test for Mice
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Is Self-Interacting Dark Matter Undergoing Dark Fusion?

Samuel D McDermott1

  • 1Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-5011, USA.

Physical Review Letters
|June 16, 2018
PubMed
Summary

Dark matter fusion offers a solution to small-scale structure problems within the cold dark matter model. This process requires specific cross-section scaling and a dark nuclear scale, potentially observable in galaxy groups.

Area of Science:

  • Cosmology and Astrophysics
  • Particle Physics
  • Dark Matter Physics

Background:

  • The standard cold collisionless dark matter paradigm faces challenges explaining observed small-scale structures.
  • Astrophysical observations of galaxy distribution and formation require a resolution to these discrepancies.

Purpose of the Study:

  • To propose dark matter fusion as a viable relaxation process resolving small-scale structure issues.
  • To establish the necessary conditions for dark matter fusion cross-section scaling across cosmic structures.
  • To identify observational signatures that can distinguish dark fusion from alternative dark matter models.

Main Methods:

  • Theoretical modeling of two-to-two dark matter fusion interactions.
  • Analysis of dark matter fusion cross-section scaling with astrophysical mass scales.

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  • Comparison of dark fusion predictions with observational data from dwarf galaxies to galaxy clusters.

    • Main Results:

    • Dark matter fusion requires fractional binding energy release greater than v^{n}∼(10^{-(2-3)})^{n} for astrophysical scaling.
    • The interaction cross-section is estimated at σ∼0.1-1 barn, implying a dark nuclear scale Λ∼O(100 MeV).
    • Dark fusion predicts a constant cross-section velocity (σv) below galaxy cluster velocities.

    Conclusions:

    • Dark matter fusion presents a compelling mechanism to address small-scale structure problems in cosmology.
    • Observational studies of galaxy groups with specific velocity dispersions can test this dark fusion hypothesis.
    • Distinguishing dark fusion from dark photon models is possible through analysis of galactic dynamics.