Emergent universe in spatially flat cosmological model

The scenario of an emergent universe provides a promising resolution to the big bang singularity in universes with positive or negative spatial curvature. It however remains unclear whether the scenario can be successfully implemented in a spatially flat universe which seems to be favored by present...

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Published inJournal of cosmology and astroparticle physics Vol. 2014; no. 1; pp. i - 13
Main Authors Zhang, Kaituo, Wu, Puxun, Yu, Hongwei
Format Journal Article
LanguageEnglish
Published United States 01.01.2014
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BRANES
Climb
COSMOLOGICAL INFLATION
COSMOLOGICAL MODELS
Cosmology
Flats
Inflation
M-THEORY
Mathematical analysis
MATHEMATICAL SOLUTIONS
MATTER
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POTENTIALS
RESOLUTION
SCALAR FIELDS
Scalars
Singularities
SINGULARITY
STABILITY
UNIVERSE
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Summary:The scenario of an emergent universe provides a promising resolution to the big bang singularity in universes with positive or negative spatial curvature. It however remains unclear whether the scenario can be successfully implemented in a spatially flat universe which seems to be favored by present cosmological observations. In this paper, we study the stability of Einstein static state solutions in a spatially flat Shtanov-Sahni braneworld scenario. With a negative dark radiation term included and assuming a scalar field as the only matter energy component, we find that the universe can stay at an Einstein static state past eternally and then evolve to an inflation phase naturally as the scalar field climbs up its potential slowly. In addition, we also propose a concrete potential of the scalar field that realizes this scenario.
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2014/01/048