The Cosmic Triangle: Revealing the State of the Universe

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

1999-06-29

arxiv.org/abs/astro-ph/9906463v4

Science 284:1481-1488,1999

Astronomy and Astrophysics

Astrophysics

36 pages, 8 eps figures, use epsfig.sty, final draft of paper to appear in Science 284, 1481-1488, (1999) Change to CMB plot,

Scientific paper

10.1126/science.284.5419.1481

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.

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