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arXiv 1009.4952hep-thgr-qc
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自紧引力

Self-Compactifying Gravity

Beyhan Pulice, Sukru Hanif Tanyildizi

摘要:

我们利用高曲率引力f(R)研究额外维的自紧化,其中f(R)是Ricci标量R的通有函数。首先,我们通过保角变换将纯f(R)理论约化为标量张量理论。然后,我们表明,通过第二保角变换,这个标量张量理论原来是一个非极小标量张量理论。我们发现非零标量场的配置,满足部分消失的能量动量张量和非最小标量张量理论的运动方程的条件。有趣的是,我们发现引力源具有离散谱。势的最小值随标量场与曲率标量场的耦合常数的变化而变化。当一个消失的标量场的最小值为零时,整个时空是平坦的。当非零标量场的最小值为非零值时,额外空间被紧化。因此,我们证明了一个给定的f(R)理论可以自紧化额外维。

英文摘要:

We study the self-compactification of extra dimensions via higher curvature gravity, f(R), where f(R) is the generic function of the Ricci scalar R. First, we reduce pure f(R) theory to a scalar-tensor theory by a conformal transformation. Then we show that, by a second conformal transformation, this scalar-tensor theory turns out to a nonminimal scalar-tensor theory. We find non-vanishing scalar field configurations that satisfy the conditions on the partially vanishing energy-momentum tensor and the equations of motion of the nonminimal scalar-tensor theory. It is interesting that we find that the source of gravity has discrete spectrum. The minimum of the potential changes according to the value of the coupling constant of the scalar field to the curvature scalar. When the minimum is at zero for a vanishing scalar field, the entire spacetime is flat. When the minimum is at a nonzero value for a non-vanishing scalar field, the extra space is compactified. We thus show that a given f(R) theory can self-compactify the extra dimensions.

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