### Abstract

The case for an open universe versus a flat universe with nonzero cosmological constant is reanalyzed, following new globular cluster dating results that now suggest a dramatically reduced lower limit on the age of the universe, which, for example, allow age consistency for a flat matter-dominated universe with a Hubble constant H_{0} ≤ 67 km s^{-1} Mpc^{-1}. I incorporate not only the new age data but also updates on baryon abundance constraints and large-scale structure arguments. For the first time, the allowed parameter space for the density of nonrelativistic matter appears larger for an open universe than for a flat universe with cosmological constant, while a flat universe with zero cosmological constant remains strongly disfavored, in spite of the fact that it is now more consistent with the new age constraint. I argue that fundamental theoretical arguments favor a nonzero cosmological constant over an open universe. However, if either case is confirmed, the challenges posed for fundamental physics will be great.

Original language | English (US) |
---|---|

Pages (from-to) | 461-466 |

Number of pages | 6 |

Journal | Astrophysical Journal |

Volume | 501 |

Issue number | 2 PART 1 |

DOIs | |

State | Published - Jul 10 1998 |

### Keywords

- Cosmology: theory

### ASJC Scopus subject areas

- Astronomy and Astrophysics
- Space and Planetary Science

## Fingerprint Dive into the research topics of 'The end of the age problem, and the case for a cosmological constant revisited'. Together they form a unique fingerprint.

## Cite this

*Astrophysical Journal*,

*501*(2 PART 1), 461-466. https://doi.org/10.1086/305846