The Cosmic Triangle: Revealing the State of the Universe

Author:

Bahcall Neta A.1,Ostriker Jeremiah P.1,Perlmutter Saul2,Steinhardt Paul J.3

Affiliation:

1. Princeton University Observatory, Princeton, NJ 08544, USA.

2. Institute for Nuclear and Particle Astrophysics, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

3. Department of Physics, Princeton University, Princeton, NJ 08544, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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