5-具有引力Nambu-Goto匹配条件的维膜世界
5-dimensional braneworld with gravitating Nambu-Goto matching conditions
摘要：
我们继续调查最近提出的替代匹配条件的自引力缺陷，推广的标准匹配条件。这项研究的理由是需要各种余维缺陷的一致性，以及在探针极限处存在有意义的运动方程，这似乎是标准方法所缺乏的。这些匹配条件是通过改变相对于膜嵌入场（而不是相对于膜位置处的体度规）的膜-体作用量而产生的，这种方式考虑了膜对体的引力反作用。它们总是具有Nambu-Goto探测极限，并且任何余维亏损对于任何二阶体引力理论似乎都是一致的。在这里，我们详细考虑的情况下，余维1膜在五维爱因斯坦引力，推导出通用的替代结条件，并找到Z_{2}对称膜世界宇宙学，以及它的体积扩展。与标准膜世界宇宙学相比，新的膜世界宇宙学多了一个积分常数，可以解释当今物质和暗能量的含量，因此在容纳观测到的宇宙特征方面有更多的自由度。一个分支的解决方案具有渐近线性LFRW制度。我们已经限制了参数，以便从一个长减速时代到一个小的今天加速时代的最近通道，我们已经计算了宇宙的年龄，与当前数据和随时间变化的暗能量状态方程一致。对于一系列的参数，它是可能的宇宙学提供一个大的加速在高能量制度。
英文摘要：
We continue the investigation of a recent proposal on alternative matching conditions for self-gravitating defects which generalize the standard matching conditions. The reasoning for this study is the need for consistency of the various codimension defects and the existence of a meaningful equation of motion at the probe limit, things that seem to lack from the standard approach. These matching conditions arise by varying the brane-bulk action with respect to the brane embedding fields (and not with respect to the bulk metric at the brane position) in a way that takes into account the gravitational back-reaction of the brane to the bulk. They always possess a Nambu-Goto probe limit and any codimension defect is seemingly consistent for any second order bulk gravity theory. Here, we consider in detail the case of a codimension-1 brane in five-dimensional Einstein gravity, derive the generic alternative junction conditions and find the Z_{2}-symmetric braneworld cosmology, as well as its bulk extension. Compared to the standard braneworld cosmology, the new one has an extra integration constant which accounts for the today matter and dark energy contents, therefore, there is more freedom for accommodating the observed cosmic features. One branch of the solution possesses the asymptotic linearized LFRW regime. We have constrained the parameters so that to have a recent passage from a long deceleration era to a small today acceleration epoch and we have computed the age of the universe, consistent with current data, and the time-varying dark energy equation of state. For a range of the parameters it is possible for the presented cosmology to provide a large acceleration in the high energy regime.
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