NONSINGULAR ORIGIN OF THE UNIVERSE AND THE COSMOLOGICAL CONSTANT PROBLEM

被引:4
作者
Guendelman, E. I. [1 ]
机构
[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2011年 / 20卷 / 14期
关键词
Nonsingular cosmologies; cosmological constant problem; two measures theories; emergent universe scenarios; EMERGENT UNIVERSE; INFLATION;
D O I
10.1142/S0218271811020718
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider a nonsingular origin for the universe starting from an Einstein static universe in the framework of a theory which uses two volume elements root-gd(4)x and Phi d(4)x, where Phi is a metric independent density, also curvature, curvature square terms, first order formalism and for scale invariance a dilaton field phi are considered in the action. In the Einstein frame we also add a cosmological term that parametrizes the zero point fluctuations. The resulting effective potential for the dilaton contains two flat regions, for phi -> infinity relevant for the nonsingular origin of the universe and phi -> -infinity, describing our present universe. Surprisingly, avoidance of singularities and stability as phi -> infinity imply a positive but small vacuum energy as phi -> -infinity. Zero vacuum energy density for the present universe is the " threshold" for universe creation.
引用
收藏
页码:2767 / 2771
页数:5
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