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Large-scale homogeneity of the Universe measured by the microwave background

Abstract

The isotropy of the cosmic-microwave background is a measure of the homogeneity of the Universe at the epoch of last scattering, conventionally taken to be the epoch of recombination of the primeval plasma at a redshift zs 1,000. Here we report measurements of the isotropy at a wavelength of 3 cm. At the 95% confidence level, our results restrict departures from isotropy to < 5–7×10−4 on angular scales of 2−10°. The angular scale of our observations is of particular cosmological significance because regions of size 1° and above1,2 were not causally connected at the epoch of last scattering, at least in conventional big-bang models. Thus in these models, isotropy on scales 1° an be stipulated only as an initial condition. In the new inflationary models3, on the other hand, a causal process to produce large-scale isotropy is included.

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References

  1. Peebles, P. J. E. Physical Cosmology, Ch. 5 (Princeton University Press, 1971).

    Google Scholar 

  2. Weinberg, S. Gravitation and Cosmology Ch. 15 (Wiley, New York, 1972).

    Google Scholar 

  3. Wilczek, F. & Rees, M. J. in The Very Early Universe (eds Gibbons, G. W., Hawking, S. W. & Siklos, S. T. C.) (Cambridge University Press, 1983).

    Google Scholar 

  4. Lubin, P. M., Epstein, G. L. & Smoot, G. F. Phys. Rev. Lett. 50, 616–619 (1983).

    Article  ADS  CAS  Google Scholar 

  5. Fixsen, D. J., Cheng, E. S. & Wilkinson, D. T. Phys. Rev. Lett. 50, 620–622 (1983).

    Article  ADS  CAS  Google Scholar 

  6. Peebles, P. J. E. The Large Scale Structure of the Universe (Princeton University Press, 1980).

    Google Scholar 

  7. Melchiorri, F., Melchiorri, B., Ceccarelli, C. & Pietranera, L. Astrophys. J. Lett. 250, L1–L4 (1981).

    Article  ADS  CAS  Google Scholar 

  8. Strukov, I. A. & Skulachev, D. P. Soviet Astr. Lett 10, 1–4 (1984).

    ADS  Google Scholar 

  9. Lasenby, A. N. & Davies, R. D. Mon. Not. R. Astr. Soc. 203, 1137–1169 (1983).

    Article  ADS  CAS  Google Scholar 

  10. Parijskij, Yu. N., Petrov, Z. E. & Cherkov, L. N. Soviet Astr. Lett. 3, 262–265 (1977).

    ADS  Google Scholar 

  11. Berlin, A. B. et al. IAU Symp. No. 104, 1983).

  12. Lasenby, A. N. thesis, Manchester Univ. (1981).

  13. Calzolari, P. et al. 17th Int. Cosmic Ray Conf. 9, 270–271 (1981).

    ADS  Google Scholar 

  14. Hogan, C. J. Month. Not. R. Astr. Soc. 192, 891–903 (1980).

    ADS  CAS  Google Scholar 

  15. Boynton, P. E. & Partridge, R. B. Astrophys. J. 181, 243–254 (1973).

    Article  ADS  Google Scholar 

  16. Partridge, R. B. Astrophys. J. 235, 681–687 (1980).

    Article  ADS  Google Scholar 

Download references

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Mandolesi, N., Calzolari, P., Cortiglioni, S. et al. Large-scale homogeneity of the Universe measured by the microwave background. Nature 319, 751–753 (1986). https://doi.org/10.1038/319751a0

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