论文标题
与混合动态宇宙常数的现象学深色能量模型
Phenomenological Dark Energy model with hybrid dynamic Cosmological Constant
论文作者
论文摘要
我们通过将真空能量或宇宙学常数$λ$关联来研究暗能量，这本质上是动态的。我们的方法是现象学，属于可变$λ$宇宙学领域。然而，是由亚稳态真空衰减的量子理论的动机，我们提出了$λ$（t）的新现象学衰减定律，其中$λ$（t）是常数和可变成分的叠加。 $λ$（t）= $λ_{C} $ + $ + $ + $λ_{v} $，标题中用$“ $“ $ hybrid dynamic $” $表示。通过使用由黑暗能量和另一个主要组成部分组成的宇宙进行简化的两流体情景，我们找到了三种特定现象学表达的解决方案，并根据稀释参数的参数进行了模型的参数化（稀释参数已在文本中定义为在其他主要组成部分表达中的规模因子的指数中，代表组成部分的稀释度，代表了稀释范围的延伸，这些稀释均具有稀释范围的延伸。 For pressureless Dust and dynamic Dark Energy Universe, we found the present-day matter density ($Ω_{m0}$) and dilution parameter (u) to be $Ω_{m0}$ = 0.29 $\pm$ 0.03, u = 2.90 $\pm$ 0.54 at 1 $σ$ by analysing 580 supernova from Union 2.1 catalogue.该模型的物理特征在尺度因子演化，减速参数，宇宙年龄也已经进行了研究，并使用$λ$ CDM模型绘制了相似之处。还检查了模型中宇宙学问题的状态，该状态表明该模型解决了宇宙恒定的问题，但巧合问题仍然存在于模型中。
We investigate Dark Energy by associating it with vacuum energy or Cosmological constant $Λ$ which is taken to be dynamic in nature. Our approach is phenomenological and falls within the domain of variable-$Λ$ Cosmology. However, motivated by quantum theory of metastable vacuum decay, we proposed a new phenomenological decay law of $Λ$(t) where $Λ$(t) is a superposition of constant and variable components viz. $Λ$(t) = $Λ_{C}$ + $Λ_{v}$ which is indicated by the word $"$hybrid dynamic$"$ in the title. By taking a simplified two-fluid scenario with the Universe consisting of Dark Energy and another major component, we found the solutions for three particular phenomenological expressions and made a parametrization of the model in terms of dilution parameter (the dilution parameter has been defined in the text as the exponent of scale factor in the expression of density of the other major component, representing the dilution of the component with the expansion of Universe in the presence of dynamic Dark Energy). For pressureless Dust and dynamic Dark Energy Universe, we found the present-day matter density ($Ω_{m0}$) and dilution parameter (u) to be $Ω_{m0}$ = 0.29 $\pm$ 0.03, u = 2.90 $\pm$ 0.54 at 1 $σ$ by analysing 580 supernova from Union 2.1 catalogue. The physical features of the model in regard to scale factor evolution, deceleration parameter, cosmic age has also been studied and parallels have been drawn with $Λ$CDM model. The status of Cosmological problems in the model has also been checked which showed that the model solves the Cosmological Constant Problem but the Coincidence problem still exists in the model.
