结合DGP引力和Chaobergin气体的暗能量模型
A Dark Energy model combining DGP gravity and Chaplygin gas
摘要：
宇宙的膨胀正在加速，正如Ia型超新星的观测所证明的那样，它是红移的函数。解释有两种类型：爱因斯坦引力的修正或新形式的能量，创造的暗能量。加速膨胀在这里解释的Dvali-Gabadadze-Porrati（DGP）模型引力和Chaubergin气体暗能量的组合。两个模型的特征在于长度尺度L，其可以是相同的。在平面几何条件下推导了组合模型的连续性方程，并采用数值方法求解。该解具有预期的性质：在非常小的尺度（a<<L）下，能量密度表现为无压尘埃，在非常大的尺度（a>>L）下，能量密度表现为宇宙学常数。对DGP模型和Chaubergin气体模型的修改发生在L值。结果表明，相对于普通的DGP模型，目前的暗能量密度有所增加。
英文摘要：
The expansion of the Universe is accelerating, as testified by observations of supernovae of type Ia as a function of redshift. Explanations are of two types: modifications of Einstein gravity or new forms of energy, coined dark energy.The accelerated expansion is explained here by a combination of Dvali-Gabadadze-Porrati (DGP) model gravity and Chaplygin gas dark energy. Both models are characterized by a length scale L which may be the same. The continuity equation for the combined model is derived in flat geometry, and solved by numerical methods. The solution is shown to have the expected properties: at very small scales (a<<L) the energy density behaves as pressureless dust, at very large scales (a>>L) as a cosmological constant. The modifications to the DGP model and the Chaplygin gas model occur for values of a L. The results show an increase in the present dark energy density relative to the plain DGP model.
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