Stability analysis for non-minimally coupled dark energy models in the Palatini formalism
Stability analysis for non-minimally coupled dark energy models in the Palatini formalism
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Palatini形式中非最小耦合暗能量模型的稳定性分析
DOI：
10.1007/s10509-018-3339-5
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发表时间：
2018
影响因子：
1.9
通讯作者：
Yu Hongwei
中科院分区：
文献类型：
--
作者：
Wang Zuobin;Wu Puxun;Yu Hongwei
本文用整体分析的方法研究了由标量场暗能量控制的宇宙中de-Sitter解的稳定性，它与Palatini形式中定义的Ricci标量非最小耦合。引入等效势和相空间图来定性地描述De-Sitter解及其稳定性。我们发现，对于简单的幂函数，不存在稳定的De-Sitter解。而对于一些更复杂的势，即和，可以存在稳定的De-Sitter解。
In this paper, we use the method of global analysis to study the stability of de-Sitter solutions in an universe dominated by a scalar field dark energy, which couples non-minimally with the Ricci scalar defined in the Palatini formalism. Effective potential and phase-space diagrams are introduced to describe qualitatively the de-Sitter solutions and their stabilities. We find that for the simple power-law functionthere are no stable de-Sitter solutions. While for some more complicated potentials, i.e.and, stable de-Sitter solutions can exist.