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Astrophysics

Title: The Cosmic Triangle: Revealing the State of the Universe

Authors: N. Bahcall (Princeton), J.P. Ostriker (Princeton), S. Perlmutter (LBNL), P. J. Steinhardt (Princeton)
Abstract: The "cosmic triangle" is introduced as a way of representing the past, present, and future status of the universe. Our current location within the cosmic triangle is determined by the answers to three questions:
How much matter is in the universe?
Is the expansion rate slowing down or speeding up?
And, is the universe flat? A review of recent observations suggests a universe that is lightweight (matter density about one-third the critical value), is accelerating, and is flat. The acceleration implies the existence of cosmic dark energy that overcomes the gravitational self-attraction of matter and causes the expansion to speed up.
Comments: 36 pages, 8 eps figures, use epsfig.sty, final draft of paper to appear in Science 284, 1481-1488, (1999) Change to CMB plot, Fig. 6 (third MSAM data point corrected) Addition of second CMB plot with more recent data added Minor typo in figs. 1 and 2 corrected
Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
Journal reference: Science 284:1481-1488,1999
DOI: 10.1126/science.284.5419.1481
Cite as: arXiv:astro-ph/9906463
  (or arXiv:astro-ph/9906463v4 for this version)

Submission history

From: Paul Steinhardt [view email]
[v1] Tue, 29 Jun 1999 00:23:46 GMT (311kb)
[v2] Thu, 8 Jul 1999 02:35:55 GMT (375kb)
[v3] Wed, 14 Jul 1999 04:48:17 GMT (375kb)
[v4] Sun, 1 Aug 1999 11:32:45 GMT (375kb)