具有振荡状态方程的标量场的宇宙学结果。II。振荡标度与混沌加速解
Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions
摘要：
多重加速方案可以用来解决宇宙学符合问题。在本文中，在考虑早期辐射时代之后，我们重新审视了[https：//doi.org/10.1103/PhysRevD.101.063531，Phys. Rev. D { \bf 101}，063531（2020）]中提出的振荡暗能量模型的宇宙学动力学。我们发现这个模型允许宇宙在辐射时代演化为振荡标度解（OSS），在物质时代演化为混沌加速解（CAS）。从数学上讲，从OSS到CAS的过渡是一条倍周期分岔到混沌的路径。从物理上讲，有两个原因使我们相信，这种情况可以是一个很好的图片来描述真实的宇宙。一是如果宇宙在辐射时代演化为OSS，则全局宇宙学参数约束是可行的。另一个是CAS描述的晚期宇宙可以成功地解释观测到的低红移宇宙加速。
英文摘要：
Multiacceleration scenario can be used to solve the cosmological coincidence problem. In this paper, after considering the early radiation era, we revisit the cosmological dynamics of the oscillating dark energy model proposed in [https://doi.org/10.1103/PhysRevD.101.063531, Phys. Rev. D {\bf 101}, 063531 (2020)]. We find this model allows the Universe evolves as oscillating scaling solution (OSS) in the radiation era and as chaotic accelerating solution (CAS) in the matter era. Mathematically, the transition from OSS to CAS is a route of period-doubling bifurcation to chaos. Physically, there are two reasons convince us that this scenario can be a nice picture to describe the real Universe. One is the global cosmological parameter constraints are practicable if the Universe evolves as OSS in the radiation era. The other is the late-time Universe described by CAS can successfully explain the observed cosmic acceleration at low redshifts.
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