Cosmic string loop shapes
Cosmic string loop shapes
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宇宙弦环形状
DOI：
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发表时间：
2015
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通讯作者：
Benjamin Shlaer
中科院分区：
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作者：
J. Blanco;K. Olum;Benjamin Shlaer
我们分析了在扩展宇宙弦网络的大规模模拟中发现的宇宙弦环的形状。该模拟不包括引力反作用，但我们通过使用洛伦兹卷积平滑环路来对该过程进行建模。我们发现，形成时的环通常由由扭结分隔的直线段组成。我们在整个环路的尺度上没有看到尖点或任何尖点状结构，尽管我们确实看到了随着洛伦兹增强而移动的非常小的弦区域。然而，弦的平滑几乎总是在每个环上引入两个尖点。平滑过程不会导致平滑之前处于非自相交轨迹中的环出现任何明显的碎片。
We analyze the shapes of cosmic string loops found in large-scale simulations of an expanding-universe string network. The simulation does not include gravitational back reaction, but we model that process by smoothing the loop using Lorentzian convolution. We find that loops at formation consist of generally straight segments separated by kinks. We do not see cusps or any cusp-like structure at the scale of the entire loop, although we do see very small regions of string that move with large Lorentz boosts. However, smoothing of the string almost always introduces two cusps on each loop. The smoothing process does not lead to any significant fragmentation of loops that were in non-self-intersecting trajectories before smoothing.