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Extracting primordial density fluctuations

Gawiser1, Silk

  • 1E. Gawiser is at the Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA. E-mail: gawiser@astron. berkeley.edu. J. Silk is at the Departments of Physics and Astronomy and the Center for Particle Astrophysics, Univ.

Science (New York, N.Y.)
|June 5, 1998
PubMed
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Cosmic microwave background radiation and galaxy distribution data challenge popular cosmological models. However, the cold + hot dark matter model aligns with observations, suggesting massive neutrinos may constitute significant cosmic matter.

Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • The universe's evolution is shaped by primordial density fluctuations.
  • Cosmic Microwave Background (CMB) radiation and large-scale galaxy distribution provide key observational data.
  • Understanding the universe's composition requires accurate cosmological models.

Purpose of the Study:

  • To investigate the consistency of observational data with existing cosmological models.
  • To probe primordial density fluctuations across a wide range of spatial scales.
  • To determine the potential contribution of massive neutrinos to the universe's matter content.

Main Methods:

  • Analyzing data from cosmic microwave background radiation anisotropy.
  • Utilizing observations of the large-scale distribution of galaxies.

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  • Comparing observational data with predictions from various cosmological models, including the cold + hot dark matter model.

    • Main Results:

    • The combined data are inconsistent with several widely accepted cosmological models.
    • The cold + hot dark matter model shows agreement with the observational data.
    • The findings suggest that massive neutrinos could represent a substantial fraction of the universe's matter.

    Conclusions:

    • The standard cosmological models may require revision.
    • The cold + hot dark matter model offers a viable framework for understanding cosmic structure formation.
    • The existence of massive neutrinos is supported as a significant component of the universe's matter density.