The Tinsley Diagram Revisited

Details The Tinsley Diagram Revisited The Tinsley Diagram Revisited

1995-01-09

arxiv.org/abs/astro-ph/9501023v1

Astronomy and Astrophysics

Astrophysics

8 pages, uses aasms.sty, 1 uuencoded PostScript figure appended, (accepted to appear in Ap.J.Letters)

Scientific paper

10.1086/187788

Motivated by the recent determinations of the Hubble constant $(H_0)$ from observations of Cepheid variables in NGC4571 and M100, we plot the Tinsley diagram with level curves of the cosmological constant $(\Lambda)$. Based on current estimates of the absolute ages of globular clusters we conclude that $\Lambda > 0$ and, irrespective of the background spatial curvature, the universe will not recollapse. These conclusions hold for both relativistic and Newtonian models and are {\it independent} of the density parameter.

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