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arXiv 1808.01653gr-qchep-th
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非保守引力对宇宙弦组态的某些影响

Some effects of non-conservative gravity on cosmic string configurations

E. A. F. Bragança, Thiago R. P. Caramês, Júlio C. Fabris, Antônio de Pádua Santos

摘要:

我们研究了能量动量张量的特定非守恒对某些宇宙弦结构物理学的影响。这种不守恒是由最近引入的一种新的引力理论引起的,这种引力理论试图将耗散系统纳入引力描述中。这个模型的重力被赋予一个变分原理,其中的作用依赖于几何扇区的假设。对于阿贝尔-希格斯弦,我们推导出动力学方程,并提供数值解描述的希格斯和规范场的行为,以及配置文件的度量函数的不同情况下的参数,表征模型。此外,从这个数值方法中,我们发现如何宇宙弦的内部结构的影响,这背后的引力理论,通过分析的偏差,每单位长度的质量和赤字的弦角。接下来,我们继续进行分析处理,获得接近弦轴的解决方案,也相应的真空解决方案。我们的分析结果也补充了一个厚宇宙弦模型的研究,其中缺陷被赋予有限的核心。在这种情况下,我们得到了适当的内部解,它与外部的真空度规结合在一起,提供了外部几何的精确解,推广了以前的结果,并导致宇宙弦单位长度质量的减少。

英文摘要:

We investigate some consequences of a specific non-conservation of the energy-momentum tensor on the physics of certain cosmic string configurations. This non-conservation is induced by a new gravitational theory recently introduced as an attempt to incorporate dissipative systems in the gravity description. This model of gravity is endowed with a variational principle, where an action-dependence on the geometric sector is assumed. For the Abelian-Higgs string we derive the dynamical equations and provide the numerical solutions describing the behavior of the Higgs and gauge fields as well as the profile of the metric functions for different cases of the parameter that characterises the model. Additionally, from this numerical approach we find how the inner structure of the cosmic string is affected by this underlying gravitational theory, by analyzing the deviations both on the mass per unit length and the deficit angle of the string. Next, we proceed with an analytical treatment obtaining the solution close to the string axis and also the corresponding vacuum solution. Our analytical results are also complemented with the study of a thick cosmic string model, where the defect is endowed with finite core. In this case we have obtained the proper interior solution which joined together with the vacuum metric outside provides an exact solution for the exterior geometry which generalizes previous results and leads to a decreasing of the mass per unit length of the cosmic string.

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。

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