The Cosmic Triangle: Revealing the State of the Universe
Neta A. BahcallPrinceton University Observatory, Princeton, NJ 08544, USAJeremiah P. OstrikerPrinceton University Observatory, Princeton, NJ 08544, USAS. PerlmutterInstitute for Nuclear and Particle Astrophysics, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USAPaul J. SteinhardtDepartment of Physics, Princeton University, Princeton, NJ 08544, USA
1999en
ABI
Аннотация
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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