Universe Models with a Variable Cosmological “Constant” and a “Big Bounce” | Zendy

Hongya Liu | Zendy; Paul S. Wesson | Zendy

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Universe Models with a Variable Cosmological “Constant” and a “Big Bounce”

Author(s) -

Hongya Liu,

Paul S. Wesson

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323525

Subject(s) - physics , cosmological constant , theoretical physics , big bang (financial markets) , big bounce , general relativity , vacuum energy , de sitter universe , cosmology , inflation (cosmology) , non standard cosmology , ultimate fate of the universe , universe , spacetime , physical cosmology , astrophysics , quantum mechanics , finance , economics

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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