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arXiv 1609.01685gr-qcastro-ph.CO
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分段线性宇宙弦环上的引力反作用

Gravitational back reaction on piecewise linear cosmic string loops

Jeremy M. Wachter, Ken D. Olum

摘要:

我们计算了分段线性宇宙弦环的度规和仿射连接,以及四段直线的Garfinkle-Vachaspati环的引力反作用效应。正如预期的那样,反作用减小了环的大小,与进入引力波的能量一致。“方形”(最大对称)环在不改变形状的情况下蒸发,但对于此类中的所有其他环,扭结变得不那么尖锐,扭结之间的段变得弯曲。如果线圈接近正方形,它将在其扭结发生显著变化之前蒸发,如果线圈远离正方形,扭结的打开比线圈的蒸发快得多。

英文摘要:

We calculate the metric and affine connection due to a piecewise linear cosmic string loop, and the effect of gravitational back reaction for the Garfinkle-Vachaspati loop with four straight segments. As expected, back reaction reduces the size of the loop, in accord with the energy going into gravitational waves. The "square" (maximally symmetric) loop evaporates without changing shape, but for all other loops in this class, the kinks become less sharp and segments between kinks become curved. If the loop is close to the square case, it will evaporate before its kinks are significantly changed, if it is far from square, the opening out of the kinks is much faster than evaporation of the loop.

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