Universe Models with a Variable Cosmological "Constant" and a "Big Bounce"

Details Universe Models with a Variable Cosmological "Constant" and a "Big Bounce" Universe Models with a Variable Cosmological "Constant" and a "Big Bounce"

2001-07-28

arxiv.org/abs/gr-qc/0107093v1

Astrophys.J. 562 (2001) 1-6

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 2 figures, AASTEX. To appear in ApJ

Scientific paper

10.1086/323525

We present a rich class of exact solutions which contains radiation-dominated and matter-dominated models for the early and late universe. They include a variable cosmological ``constant'' which is derived from a higher dimension and manifests itself in spacetime as an energy density for the vacuum. This is in agreement with observational data and is compatible with extensions of general relativity to string and membrane theory. Our solutions are also typified by a non-singular ``big bounce'' (as opposed to a singular big bang), where matter is created as in inflationary cosmology.

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