arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.0026gr-qchep-th
收藏

5维宇宙弦的弯曲角亏损

Warped Angle-deficit of a 5 Dimensional Cosmic String

Reinoud Jan Slagter, Derk Masselink

摘要:

在Einstein-Yang-Mills理论中,我们提出了一个弯曲的五维时空中的宇宙弦。四维宇宙弦表现出一些严重的问题,关于弦的平滑机制与单位长度弦的质量$Gμ\approx 10^{-6}$有关。一个弯曲的宇宙弦可以克服这个问题,也可以克服超弦要求$Gμ$必须是1阶的,这远远超过了观测界限。另外,我们提出的扭曲宇宙弦模型可以解释宇宙弦轴对称透镜效应的观测证据的缺乏:弦的角度亏损在膜中被扭曲到不可观测的值,与其在体中的值相比。结果表明,只有当宇宙学常数为负时,模型才有可能得到一致的数值解。

英文摘要:

We present a cosmic string on a warped five dimensional space time in Einstein-Yang-Mills theory. Four-dimensional cosmic strings show some serious problems concerning the mechanism of string smoothing related to the string mass per unit length, $Gμ\approx 10^{-6}$. A warped cosmic string could overcome this problem and also the superstring requirement that $Gμ$ must be of order 1, which is far above observational bounds. Also the absence of observational evidence of axially symmetric lensing effect caused by cosmic strings could be explained by the warped cosmic string model we present: the angle deficit of the string is warped down to unobservable value in the brane, compared to its value in the bulk. It turns out that only for negative cosmological constant, a consistent numerical solution of the model is possible.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑