String production after angled brane inflation
String production after angled brane inflation
复制标题
成角度的膜膨胀后的弦生产
DOI：
10.1103/physrevd.70.023502
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发表时间：
2004
影响因子：
5
通讯作者：
T. Matsuda
中科院分区：
文献类型：
--
作者：
T. Matsuda
我们描述了角膜暴胀后弦的产生。首先，我们指出，以前的讨论中存在着矛盾。从四维有效拉格朗日量计算出的宇宙弦的预期张力与膜分析中得到的张力不匹配。在前面的分析中，宇宙弦被假设为对应于低维的子膜，它包裹着与原始母膜相同的紧致空间。然而，在这种情况下，子膜的张力不能依赖于角度$（\ensuremath{\theta}）。另一方面，从快子凝聚的有效拉格朗日量的分析，很容易看出，宇宙弦的张力必须与$\ensuremath{\theta}，$当$\ensuremath{\theta}\ensuremath{\ll}1.$这是一个明显的差异，必须通过考虑显式膜动力学来解释。在本文中，我们将通过引入一个简单的想法来解决这个问题。我们计算了这两种情况下弦的张力，结果精确地吻合。角度暴胀的宇宙学约束被放松了，因为宇宙弦的预期张力比以前的论证中得到的小了一个因子，即$\ensuremath{\theta}。
We describe string production after angled brane inflation. First, we point out that there was a discrepancy in previous discussions. The expected tension of the cosmic string calculated from the four-dimensional effective Lagrangian did not match the one obtained in the brane analysis. In the previous analysis, the cosmic string is assumed to correspond to the lower-dimensional daughter brane, which wraps the same compactified space as the original mother brane. In this case, however, the tension of the daughter brane cannot depend on the angle $(\ensuremath{\theta}).$ On the other hand, from the analysis of the effective Lagrangian for tachyon condensation, it is easy to see that the tension of the cosmic string must be proportional to $\ensuremath{\theta},$ when $\ensuremath{\theta}\ensuremath{\ll}1.$ This is an obvious discrepancy that must be explained by consideration of the explicit brane dynamics. In this paper, we will solve this problem by introducing a simple idea. We calculate the tension of the string in the two cases, which matches precisely. The cosmological constraint for angled inflation is relaxed, because the expected tension of the cosmic string becomes smaller than the one obtained in previous arguments, by a factor of $\ensuremath{\theta}.$