Letter | Published:

Accelerating Universe revisited

Abstract

THERE is growing evidence that the Hubble constant is of the order of 100 km s−1 Mpc−1, rather than only half as great1. The purpose of this paper is to discuss the Friedman models that are consistent with such a large expansion rate, as well as with current estimates of stellar ages and the density of the Universe. If one accepts estimates of at least 100km s−1 Mpc−1 for the Hubble constant, and that globular clusters have ages of the order of 16,000 Myr, then the only possible Friedman models of the Universe are those with a positive cosmological constant and q0 < −1. Various independent tests of this conclusion are suggested.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Balkowski, C. & Westerlund, B. E. (eds) Decalages vers le Rouge et Expansion de l' Universe; l' Evolution des Galaxies et ses Implications Cosmologiques (CNRS, Paris, 1977).

  2. 2

    Lynden-Bell, D. Nature 270, 396 (1977).

  3. 3

    Demarque, P. & McClure, R. D. in The Evolution of Galaxies and Stellar Populations (eds Tinsley, B. M. & Larson, R. B.) (Yale University Observatory, New Haven, 1977).

  4. 4

    Saio, H. Astrophys. Space Sci. 50, 93 (1977).

  5. 5

    Petrosian, V. in Confrontation of Cosmological Theories with Observational Data (ed. Longair, M. S.) (Reidel, Dordrecht, 1974).

  6. 6

    Gunn, J. E. & Tinsley, B. M. Nature 257, 454 (1975).

  7. 7

    Petrosian, V., Salpeter, E. E. & Szekeres, P. Astrophys. J. 147, 1222 (1967).

  8. 8

    Petrosian, V. & Salpeter, E. E. Astrophys. J. 151, 411 (1968).

  9. 9

    Refsdal, S., Stabell, R., & de Lange, F. G. Mem. R. astr. Soc. 71, 143 (1967).

  10. 10

    Shklovsky, I. S. Astrophys. J. Lett. 150, L1 (1967).

  11. 11

    Kardashev, N. Astrophys. J. Lett. 150, L135 (1967).

  12. 12

    Gott, J. R., Gunn, J. E., Schramm, D. N., & Tinsley, B. M. Astrophys. J. 194, 543 (1974).

  13. 13

    Davis, M., Geller, M. J. & Huchra, J. Astrophys. J. 221, 1 (1978).

  14. 14

    Gott, J. R. & Turner, E. L. Astrophys. J. 209, 1 (1976).

  15. 15

    Blandford, R. D., McKee, C. F. & Rees, M. J. Nature 267, 211 (1977).

  16. 16

    Tinsley, B. M. Physics Today 30, 32 (1977 June).

  17. 17

    Gunn, J. E. & Oke, J. B. Astrophys. J. 195, 255 (1975).

  18. 18

    Kristian, J., Sandage, A. R. & Westphal, J. A. Astrophys. J. 221, 383 (1978).

  19. 19

    Schmidt, M. Astrophys. J. 151, 393 (1968).

  20. 20

    Gunn, J. E., Lee, B. W., Lerche, I., Schramm, D. N. & Steigman, G. Astrophys. J. (in the press).

  21. 21

    Yahil, A., & Beaudet, G. Astrophys. J. 206, 26 (1976).

  22. 22

    Epstein, R. I., Lattimer, J. M., & Schramm, D. N. Nature 263, 198 (1976).

  23. 23

    Barnothy, J. M. & Barnothy, M. F. Bull. Am. astr. Soc. 3, 472 (1971).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.