两相速子场宇宙中移动宇宙学参数和移动尘埃物质的演化
Evolution of shifted cosmological parameter and shifted dust matter in a two-phase tachyonic field universe
摘要：
我们提出了一个超光速标量场在宇宙两相演化的模型。场分量在阶段I中不相互作用，而在随后的阶段II中，它们由于辐射贡献的相对抑制而改变味道。在第二阶段，我们允许它们在状态方程中以与时间无关的微扰相互作用，如移动的宇宙学参数（SCP）和移动的尘埃物质（SDM）。我们确定的解决方案，其标度与宇宙红移在这两个阶段。我们进一步提出了标准化哈勃函数诊断法，它与低、高红移$H(z)$数据以及来自CMBR、BAO统计等的当前密度参数的一致性值一起，约束的相互作用的强度，通过施加可行的条件，打破退化的3参数$(γ, \varepsilon, \dotϕ^2)$空间。红移$(z=0.1$到$z=1.75)$的范围被选择来突出结构形成过程中相互作用的作用，并且它可能导致在该模型\emph{vis a vis}暖暗物质（WDM）或$Λ$ CDM模型中的功率谱的未来分析。在模型参数的简并空间内，我们进一步计算了相互作用对确定宇宙年龄的影响。
英文摘要：
We propose a model of the evolution of the tachyonic scalar field over two phases in the universe. The field components do not interact in phase I, while in the subsequent phase II, they change flavours due to relative suppression of the radiation contribution. In phase II, we allow them to interact mutually with time-independent perturbation in their equations of state, as Shifted Cosmological Parameter (SCP) and Shifted Dust Matter (SDM). We determine the solutions of their scaling with the cosmic redshift in both phases. We further suggest the normalized Hubble function diagnostic, which, together with the low- and high-redshift $H(z)$ data and the concordance values of the present density parameters from the CMBR, BAO statistics etc., constrains the strength of interaction, by imposing the viable conditions to break degeneracy in 3-parameter $(γ, \varepsilon, \dotϕ^2)$ space. The range of redshifts $(z=0.1$ to $z=1.75)$ is chosen to highlight the role of interaction during structure formation, and it may lead to a future analysis of power spectrum in this model \emph{vis a vis} Warm Dark Matter (WDM) or $Λ$CDM models. We further calculate the influence of interaction in determining the age of the universe at the present epoch, within the degeneracy space of model parameters.
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