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arXiv 0812.4694gr-qchep-th
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Riemann-Cartan时空中的测试膜

Test membranes in Riemann-Cartan spacetimes

Milovan Vasilic, Marko Vojinovic

摘要:

从应力-能量守恒方程和自旋张量守恒方程出发,导出了有挠时空中类膜扩张体的动力学性质。因此,获得的世界片方程适用于宏观测试膜的旋转物质。具体来说,我们认为膜的应力-能量和自旋的最大对称分布。它们的特征仅在于两个常数:张力和自旋幅度。通过求解世界片方程,我们发现了黎曼-嘉当背景下的这种膜与低能弦背景下的弦论膜之间的相似性。在论文的第二部分,我们将这个结果应用到包裹在$(D+1)$维时空的超紧维上的圆柱膜。在窄膜极限下,我们发现了有效的宏观弦如何与挠率耦合。注意到与弦西格玛模型观察到的相似性。

英文摘要:

The dynamics of brane-like extended objects in spacetimes with torsion is derived from the conservation equations of stress-energy and spin tensors. Thus obtained world-sheet equations are applied to macroscopic test membranes made of spinning matter. Specifically, we consider membranes with maximally symmetric distribution of stress-energy and spin. These are characterized by two constants only: the tension and spin magnitude. By solving the world-sheet equations, we discover a similarity between such membranes in Riemann-Cartan backgrounds, and string theory membranes in low-energy string backgrounds. In the second part of the paper, we apply this result to cylindrical membranes wrapped around the extra compact dimension of a $(D+1)$-dimensional spacetime. In the narrow membrane limit, we discover how effective macroscopic strings couple to torsion. An observed similarity with the string sigma model is noted.

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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