从更高维度的进化λ加速宇宙
Accelerating Universe from an Evolving Lambda in Higher Dimension
摘要：
我们在具有变化的宇宙学常数的五维非均匀物质支配模型中找到了精确解。调整任意的积分常数，也可以在我们的模型中实现加速。除了初始奇点，我们的时空在任何地方都是正则的，包括非均匀分布的中心。我们还研究了（4+d）维中类似的均匀宇宙。在这里，一个最初的减速模式被发现给后期加速符合目前的观测要求。我们还发现，各向异性和维度的数量有一个作用，在确定翻转的时间，事实上，翻转是延迟的多维模型。还计算了年龄、光度距离等天体物理参数，并简要讨论了额外维的影响。有趣的是，与许多其他经典模型相比，我们的模型得出了更大的宇宙年龄。
英文摘要：
We find exact solutions in five dimensional inhomogeneous matter dominated model with a varying cosmological constant. Adjusting arbitrary constants of integration one can also achieve acceleration in our model. Aside from an initial singularity our spacetime is regular everywhere including the centre of the inhomogeneous distribution. We also study the analogous homogeneous universe in (4+d) dimensions. Here an initially decelerating model is found to give late acceleration in conformity with the current observational demands. We also find that both anisotropy and number of dimensions have a role to play in determining the time of flip, in fact the flip is delayed in multidimensional models. Some astrophysical parameters like the age, luminosity distance etc are also calculated and the influence of extra dimensions is briefly discussed. Interestingly our model yields a larger age of the universe compared to many other quintessential models.
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