Emerging universe from scale invariance

被引:34
作者
del Campo, Sergio [1 ]
Guendelman, Eduardo I. [2 ]
Herrera, Ramon [1 ]
Labrana, Pedro [3 ]
机构
[1] Pontificia Univ Catolica Valparaiso, Inst Fis, Valparaiso, Chile
[2] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[3] Univ Bio Bio, Dept Fis, Concepcion, Chile
关键词
modified gravity; inflation; initial conditions and eternal universe; cosmology of theories beyond the SM; GRAVITATIONAL THEORY; EMERGENT UNIVERSE; INFLATIONARY UNIVERSE; SPONTANEOUSLY BROKEN; FERMION FAMILIES; COSMOLOGY; SYMMETRY; GRAVITY; PHASE; MODEL;
D O I
10.1088/1475-7516/2010/06/026
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider a scale invariant model which includes a R-2 term in action and show that a stable "emerging universe" scenario is possible. The model belongs to the general class of theories, where an integration measure independent of the metric is introduced. To implement scale invariance (S.I.), a dilaton field is introduced. The integration of the equations of motion associated with the new measure gives rise to the spontaneous symmetry breaking (S.S.B) of S.I. After S.S.B. of S.I. in the model with the R-2 term (and first order formalism applied), it is found that a non trivial potential for the dilaton is generated. The dynamics of the scalar field becomes non linear and these non linearities are instrumental in the stability of some of the emerging universe solutions, which exists for a parameter range of the theory.
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页数:17
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