Opening up extra dimensions at ultralarge scales.
Opening up extra dimensions at ultralarge scales.
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DOI：
10.1103/physrevlett.84.5928
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发表时间：
2000-02
影响因子：
8.6
通讯作者：
R. Gregory;V. Rubakov;S. Sibiryakov
中科院分区：
文献类型：
--
作者：
R. Gregory;V. Rubakov;S. Sibiryakov
可行的高维理论的标准图景是，额外维度的直接表现只发生在短距离上，而长距离物理学实际上是四维的。我们表明，这是不一定是真的，在无限的额外维度的模型。作为一个例子，我们考虑一个五维的情况下，有三个3-膜，其中重力是五维的短距离和非常长的距离尺度，与传统的四维重力在中等长度尺度的操作。四维引力的有效性从微观到宇宙学尺度延伸的唯象可接受的范围内得到没有强烈的微调参数。
The standard picture of viable higher-dimensional theories is that direct manifestations of extra dimensions occur at short distances only, whereas long-distance physics is effectively four-dimensional. We show that this is not necessarily true in models with infinite extra dimensions. As an example, we consider a five-dimensional scenario with three 3-branes in which gravity is five dimensional at both short- and very long-distance scales, with conventional four-dimensional gravity operating at intermediate length scales. A phenomenologically acceptable range of validity of four-dimensional gravity extending from microscopic to cosmological scales is obtained without strong fine-tuning of parameters.