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Stable emergent Universe – a creation without Big‐Bang
Author(s) -
Guendelman E.,
Herrera R.,
Labrana P.,
Nissimov E.,
Pacheva S.
Publication year - 2015
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201512221
Subject(s) - physics , inflation (cosmology) , dark energy , inflationary epoch , big bang (financial markets) , universe , theoretical physics , covariant transformation , cosmology , einstein , scalar field , phase space , epoch (astronomy) , metric expansion of space , mathematical physics , galaxy , astrophysics , quantum mechanics , finance , economics
Based on an earlier introduced new class of generalized gravity‐matter models defined in terms of two independent nonRiemannian volume forms (alternative generally covariant integration measure densities) on the space‐time manifold, we derive an effective “Einstein‐frame” theory featuring the following remarkable properties: (i) We obtain effective potential for the cosmological scalar field possessing two infinitely large flat regions which allows for a unified description of both early Universe inflation as well as of present dark energy epoch; (ii) for a specific parameter range the model possesses a non‐singular stable “emergent Universe” solution which describes an initial phase of evolution that precedes the inflationary phase. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)