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The microwave background anisotropies: observations

D Wilkinson1

  • 1Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 14, 1998
PubMed
Summary
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The cosmic microwave background radiation (CMBR) reveals tiny temperature fluctuations, providing evidence for an evolving universe. These CMBR anisotropy measurements offer insights into the early universe

Area of Science:

  • Cosmology
  • Astrophysics

Background:

  • The standard cosmological model describes an evolving, expanding, and cooling universe originating approximately 15 billion years ago.
  • Cosmic Microwave Background Radiation (CMBR) is remnant heat from the early universe, exhibiting a blackbody spectrum consistent with the Big Bang model.
  • The 1992 COBE satellite detected anisotropy in the CMBR, revealing temperature fluctuations from the early universe.

Purpose of the Study:

  • To investigate the anisotropy of the Cosmic Microwave Background Radiation (CMBR).
  • To probe early universe physics by analyzing CMBR anisotropy power spectrum features.
  • To measure cosmological model parameters using CMBR anisotropy data.

Main Methods:

  • Analysis of Cosmic Microwave Background Radiation (CMBR) data, including temperature fluctuations.

Related Experiment Videos

  • Utilizing data from the Cosmic Background Explorer (COBE) satellite and advanced detector technology.
  • Developing sophisticated ground-based, balloon, and satellite experiments for CMBR anisotropy measurements.

    • Main Results:

    • Detection of 30 microK fluctuations in the CMBR temperature (2.73 K) by the COBE satellite.
    • Current experiments are searching for smaller-scale anisotropy features predicted to have formed at matter-radiation decoupling.
    • CMBR anisotropy measurements directly probe early universe physics and constrain cosmological parameters.

    Conclusions:

    • CMBR anisotropy measurements provide crucial evidence for the standard cosmological model.
    • These measurements offer direct insights into the physics of the early universe, including the epoch of decoupling.
    • Ongoing and future CMBR satellite missions will further refine our understanding of the universe's evolution and composition.