Dark matter introduction

In astrophysics, dark matter reffers to undetectable matter or particles whose presence explains unexpected gravitational effects on galaxies and stars. Various assumptions were made on the composition of dark matter :

  • Molecular gas,
  • dead stars,
  • Brown dwarf stars,
  • Black holes, etc

    However, the observations (or rather lack of direct observations) would imply a non-baryonic nature (proton, neutro), and thus still unknown nature. According to galaxies formation and evolution models as well as cosmological models, dark matter would represent approximately 30% of the total mass of the Universe.

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    Introduction First observational evidences The galactic rotation problem
    Dark matter within galaxies Dark matter between galaxies Dark matter Composition
    Baryonic Nonbaryonic Neutrino WIMP String theory