arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.1013gr-qchep-th
收藏

非最小耦合暗能量的过去渐近动力学

On the Past Asymptotic Dynamics of Non-minimally Coupled Dark Energy

Genly Leon

摘要:

我们应用动力系统技术来研究爱因斯坦框架中标量张量理论的宇宙模型。我们证明了如果势和耦合函数是足够光滑的函数,则标量场几乎总是发散到过去。两个重要的不变集的动力学进行了详细的研究。通过对势函数和耦合函数的正则性条件的假设,构造了一个动力学系统,它非常适合于研究标量场发散的动力学,即在初始奇点附近。其中的临界点进行调查和宇宙学的解决方案与他们的特点。我们发现,我们的系统承认缩放的解决方案。从参考文献中选取了一些例子来说明主要结果。同时,我们给出了初始时空奇点附近宇宙学解的渐近展开式,在某种程度上推广了前人的结果。

英文摘要:

We apply dynamical systems techniques to investigate cosmological models inspired in scalar-tensor theories written in the Einstein frame. We prove that if the potential and the coupling function are sufficiently smooth functions, the scalar field almost always diverges into the past. The dynamics of two important invariant sets is investigated in some detail. By assuming some regularity conditions for the potential and for the coupling function, it is constructed a dynamical system well suited to investigate the dynamics where the scalar field diverges, i.e. near the initial singularity. The critical points therein are investigated and the cosmological solutions associated to them are characterized. We find that our system admits scaling solutions. Some examples are taken from the bibliography to illustrate the major results. Also we present asymptotic expansions for the cosmological solutions near the initial space-time singularity, which extend in a way previous results of other researchers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑