论文标题
晚期各向异性通过2形式的领域非最少耦合到冷暗物质
Late-Time Anisotropy Sourced by a 2-Form Field Non-Minimally Coupled to Cold Dark Matter
论文作者
论文摘要
本文调查了双chi I背景中的2形田间与冷暗物质之间的相互作用引起的宇宙学动力学。我们采用动力学系统分析,确定两个吸引子,以赋予宇宙的指数扩展,即脱水解决方案。值得注意的是,这些溶液表现出关键的区别:一种与宇宙常数方案没有区别,而另一种则对应于\ emph {各向异性de-sitter}的扩展,由2型领域提出。为了验证我们的模型的渐近行为,我们对其扩展历史进行了数值探索。我们的分析表明,黑暗扇区之间的耦合在物质主导的时期扩增了剪切,提供了潜在的途径,以解决与结构形成过程相关的某些观察性差异。然后,我们使用最新的观察数据集约束模型的参数空间。值得注意的是,我们发现当前的剪切精确地约束为$σ_0\大约-10^{ - 4} $。我们还讨论了与1形式场相比,即矢量场相比,由2形式场提出的扩展动力学有一些关键差异,从而对它们对延迟向向性的支持的影响提供了见解。
This paper investigates the cosmological dynamics arising from the interaction between a 2-form field and cold dark matter within a Bianchi I background. Employing a dynamical system analysis, we identify two attractors yielding to exponential expansion of the Universe, i.e., de-Sitter solutions. Notably, these solutions exhibit a pivotal distinction: one is indistinguishable from the cosmological constant scenario, while the other corresponds to an \emph{anisotropic de-Sitter} expansion sourced by the 2-form field. To validate the asymptotic behavior of our model, we conduct a numerical exploration of its expansion history. Our analysis reveals that the coupling between the dark sectors amplifies the shear during the matter-dominated epoch, offering a potential avenue to address certain observational discrepancies related to the structure formation process. Then, we constrain the parameter space of the model using recent observational datasets. Remarkably, we find that the current shear is precisely constrained to be approximately $Σ_0 \approx - 10^{-4}$. We also discuss some key differences in the expansionary dynamics sourced by the 2-form field compared to a 1-form field, i.e., a vector field, offering insights into their respective impacts on the support they provide to late-time anisotropy.