论文标题
有效的标志切换深色能量：两种相互作用流体的Lotka-Volterra模型
An Effective Sign Switching Dark Energy: Lotka-Volterra Model of Two Interacting Fluids
论文作者
论文摘要
最近解决哈勃和$ s_8 $张力的尝试之一是考虑宇宙最初不是像保姆一样的时空，而是类似于安定的保姆。也就是说，宇宙在某个时候进行了“ ADS-TO-DS”过渡。我们研究了有两种暗能量流体的可能性，其中一种引起了反DE保姆样的早期宇宙。相互作用是由通常用于人口生物学的Lotka-Volterra方程来建模的。我们认为“竞争”模型进一步归类为“不公平竞争”和“公平竞争”。前者涉及与幻影的竞争中的精髓，第二个涉及两种幻影流体。令人惊讶的是，即使在后一种情况下，总体黑暗能量也有可能跨越幻影鸿沟。后一个模型还允许恒定的$ w $“ ads-to-ds”过渡，从而避开了理论，即这种暗能必须具有奇异的状态方程。我们还考虑了一个“转换”模型，即幻象流体仍设法实现“ ADS-to-ds”过渡，即使它被转换为负能量密度的精髓。在这些模型中，晚期有效的暗能量的能量密度与流体的二次自我相互作用项的系数有关，这类似于种群生物学的资源能力。
One of the recent attempts to address the Hubble and $S_8$ tensions is to consider the Universe started out not as a de Sitter-like spacetime, but rather anti-de Sitter-like. That is, the Universe underwent an "AdS-to-dS" transition at some point. We study the possibility that there are two dark energy fluids, one of which gave rise to the anti-de Sitter-like early Universe. The interaction is modeled by the Lotka-Volterra equations, commonly used in population biology. We consider "competition" models that are further classified as "unfair competition" and "fair competition". The former involves a quintessence in competition with a phantom, and the second involves two phantom fluids. Surprisingly, even in the latter scenario it is possible for the overall dark energy to cross the phantom divide. The latter model also allows a constant $w$ "AdS-to-dS" transition, thus evading the theorem that such a dark energy must possess a singular equation of state. We also consider a "conversion" model in which a phantom fluid still manages to achieve "AdS-to-dS" transition even if it is being converted into a negative energy density quintessence. In these models, the energy density of the late time effective dark energy is related to the coefficient of the quadratic self-interaction term of the fluids, which is analogous to the resource capacity in population biology.
