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arXiv 1212.6502hep-thastro-ph.COgr-qc
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具有平坦方向的引力宇宙弦

Gravitating cosmic strings with flat directions

Betti Hartmann, Asier Lopez-Eiguren, Kepa Sousa, Jon Urrestilla

摘要:

我们研究弯曲时空中具有平坦方向的宇宙弦的场论模型。更准确地说,我们考虑极小模型与半局域,轴子和快子弦,分别。在平坦的时空中,这些模型的弦解有一个平坦的方向,即,存在与零模式相关联的具有相同能量的单参数构型族。我们证明了零模式生存耦合到重力,并研究了耦合时的字符串的重力平坦方向的作用。尽管解的总能量相同,因而解族的整体性质保持不变,但能量密度不同,引力性质也不同。解的局部结构很大程度上依赖于描述平直方向的参数的值;例如,对于超大质量弦,自由参数的值可以决定宇宙的大小。

英文摘要:

We study field theoretical models for cosmic strings with flat directions in curved space-time. More precisely, we consider minimal models with semilocal, axionic and tachyonic strings, respectively. In flat space-time, the string solutions of these models have a flat direction, i.e., a uniparametric family of configurations with the same energy exists which is associated to a zero mode. We prove that the zero mode survives coupling to gravity, and study the role of the flat direction when coupling the strings to gravity. Even though the total energy of the solution is the same, and thus the global properties of the family of solutions remains unchanged, the energy density, and therefore the gravitational properties, are different. The local structure of the solutions depends strongly on the value of the parameter describing the flat direction; for example, for supermassive strings, the value of the free parameter can determine the size of the universe.

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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