Effect of Multiple Gravitational Lensing on the Anisotropy of the Cosmic Background Radiation

  • T. Fukushige
  • J. Makino
  • T. Ebisuzaki
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 173)

Abstract

We investigated smoothing of the cosmic background radiation (CBR) by multiple gravitational lensing. The CBR is gravitationally scattered by galaxies, clusters of galaxies, and superclusters during the travel from the last scattering surface. Although the effect of the gravitational lensing was thought to be unimportant, we found that the multiple gravitational lensing by clusters of galaxies or by superclusters can reduced by a large factor. This result is explained by the fact that the distance between two light rays grows exponentially though multiple gravitational lensing. If such structures were formed at z = 2 − 5 and contain a large fraction of the mass of the universe (Ωs > 0.5), then multiple gravitational lensing can reduce the temperature anisotropy of the CBR by 40–60%, approximately up to a degree scale.

Keywords

Exponential Growth Density Profile Cosmic Background Radiation Radio Telescope Single scatteringE 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

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Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • T. Fukushige
    • 1
  • J. Makino
    • 1
  • T. Ebisuzaki
    • 1
  1. 1.College of Arts and SciencesUniversity of TokyoMeguro-kuJapan

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