Astrophysics and Space Science

, Volume 136, Issue 1, pp 11–15 | Cite as

Evidence for a low-density inflationary universe?

  • L. I. Onuora
Article

Abstract

The inflationary unvierse model predicts the density parameter Ω0 to be ∼ 1.0 with the cosmological constant Λ0 usually taken to be zero, whereas observational estimates give Ω0≤0.2 and Λ0∼10-57 cm−2. It was found, however, that the observed variation of angular diameter with redshift for extragalactic radio sources could be interpreted in terms of a low density universe with linear size evolution of the sources for either an inflationary model with ∧≠0 or an open model with ∧=0.

Keywords

Open Model Radio Source Linear Size Density Parameter Size Evolution 

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References

  1. Audouze, J.: 1984, in G. Setti and L. Van Hove (eds.),Large-Scale Structure of the Universe. Cosmology and Fundamental Physics, Proceedings of the First ESO-CERN Symposium, p. 293.Google Scholar
  2. Eales, S. A.: 1985,Monthly Notices Roy. Astron. Soc. 217, 179.Google Scholar
  3. Ellis, J.: 1984, in G. Setti and L. Van Hove (eds.),Large-Scale Structure of the Universe. Cosmology and Fundamental Physics, Proceedings of the First ESO-CERN Symposium, p. 435.Google Scholar
  4. Faber, S. M.: 1984, in G. Setti and L. Van Hove (eds.),Large-Scale Structure of the Universe. Cosmology and Fundamental Physics, Proceedings of the First ESO-CERN Symposium, p. 187.Google Scholar
  5. Fang, L. Z., Kiang, T., Cheng, F. H., and Hu, F. X.: 1982,Quart. J. Roy. Astron. Soc. 23, 363.Google Scholar
  6. Geller, M. J. and Davis, M.: 1978,Astrophys. J. 225, 1.Google Scholar
  7. Guth, A. H.: 1981,Phys. Rev. D 23, 347.Google Scholar
  8. Kapahi, V. K.: 1975,Monthly Notices Roy. Astron. Soc. 172, 513.Google Scholar
  9. Kapahi, V. K.: 1985,Monthly Notices Roy. Astron. Soc. 214, 19p.Google Scholar
  10. Klapdor, H. V. and Grotz, K.: 1986,Astrophys. J. 301, L39.Google Scholar
  11. Linde, A. D.: 1982,Phys. Letters 108B, 389.Google Scholar
  12. Loh, E. D. and Spillar, E. J.: 1986,Astrophys. J. 307, L1.Google Scholar
  13. Miley, G. K.: 1968,Nature 218, 933.Google Scholar
  14. Miley, G. K.: 1971,Monthly Notices Roy. Astron. Soc. 52, 477.Google Scholar
  15. Nanopoulos, D. V.: 1984, in G. Setti and L. Van Hove (eds.),Large-Scale Structure of the Universe. Cosmology and Fundamental Physics Proceedings of the First ESO-CERN Symposium, p. 349.Google Scholar
  16. Okoye, S. E. and Onuora, L. I.: 1986,Astrophys. Space Sci. 122, 267.Google Scholar
  17. Peebles, P. J. E.: 1979,Astron. J. 84, 730.Google Scholar
  18. Peebles, P. J. E.: 1984,Astrophys. J. 284, 439.Google Scholar
  19. Sandage, A. and Tammann, G. A.: 1984, in G. Setti and L. Van Hove (eds.),Large-Scale Structure of the Universe, Cosmology and Fundamental Physics, Proceedings of the First ESO-CERN Symposium, p. 127.Google Scholar
  20. Sciama, D. W.: 1983, in G. O. Abell and C. Chincari (eds.),Early Evolution of the Universe and Its Present Structure, D. Reidel Publ. Co., Dordrecht, Holland, p. 493.Google Scholar
  21. Silk, J.: 1986,Nature 323, 673.Google Scholar
  22. Wardle, J. F. C. and Pottasch, R.: 1977,Ann. N. Y. Acad. Sci. 302, 605.Google Scholar
  23. Wills, D.: 1979,Astrophys. J. Suppl. 39, 291.Google Scholar
  24. Zel'dovich, Ya. B.: 1968,Usp. Fiz. Nauk 95, 209.Google Scholar

Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • L. I. Onuora
    • 1
  1. 1.Department of Physics and AstronomyUniversity of NigeriaNsukkaNigeria

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