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Inhomogeneous tachyon decay, light-cone structure and D-brane network problem in tachyon cosmology

机译:不均匀的快子衰变,光锥结构和D-brane网络   快子宇宙学中的问题

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摘要

We investigate light-cone structure on the world-volume of an unstableD-brane with a tachyon decaying inhomogeneously by using a field theoreticaldescription. It is shown that (i) light-cones governing open strings arenarrower than those governing closed strings and will eventually collapseinward in all directions except at kinks, where the tachyon remains at the topof its potential; and that (ii) light-cones governing open strings at a kinkwill be narrowed only in the direction perpendicular to the kink surface. It isalso shown that (iii) future-directed light-cones governing open strings near akink are tilted towards the kink, compared with those governing closed strings.The result (i) implies that open strings except at kinks are redshifted,compared with closed strings, and will eventually cease to be dynamical. On theother hand, the result (ii) shows that open strings on a kink surface can movefreely along the kink surface and are dynamical but do not feel the existenceof the spatial dimension perpendicular to the kink surface. The result (iii)indicates that open strings near a kink have tendency to move towards the kink.Hence, the light-cone structure vividly illustrates how open strings behaveduring the dynamical formation of a kink. We also discuss about a possibilitythat the early universe has a network of various dimensional D-branes,black-branes and tachyon matter. A problem associated with the network and apossible solution to the problem are discussed.
机译:我们使用场理论描述研究了不稳定的D-brane的球体结构,其中的tachyon不均匀地衰减着,并且不稳定。结果表明:(i)支配开放弦的光锥比支配封闭弦的光锥更窄,最终将向各个方向向内塌陷,除了扭结处,在那儿,高信琴仍处于其潜力的最高点; (ii)控制扭结处开弦的光锥只会在垂直于扭结表面的方向上变窄。还显示(iii)与控制闭合弦的那些相比,控制接近kinkin的开放字符串的未来定向的圆锥体朝着纽结倾斜。结果(i)意味着与闭合字符串相比,除了扭结之外的开放字符串都发生了红移。 ,最终将不再具有动力。另一方面,结果(ii)表明,纽结表面上的开弦可以沿着纽结表面自由移动并且是动态的,但不会感觉到垂直于纽结表面的空间尺寸的存在。结果(iii)表明,扭结附近的开弦倾向于向扭结移动。因此,光锥结构生动地说明了开弦在扭结的动态形成过程中的行为。我们还讨论了早期宇宙可能具有由各种维D大脑,黑大脑和超质子物质组成的网络的可能性。讨论了与网络相关的问题以及对该问题的可行解决方案。

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    Mukohyama, Shinji;

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  • 年度 2002
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