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arXiv 0905.3612hep-thgr-qchep-phquant-ph
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量子引力运行/时空维约化

Quantum-gravitational running/reduction of space-time dimension

Michael Maziashvili

摘要:

量子引力使时空维度依赖于区域的大小;它随着区域的大小单调增加,并且在大距离下渐近接近4。这种效应在因果动力学三角框架下的格点量子引力数值模拟[hep-th/0505113]以及量子引力的重整化群方法[hep-th/0508202]中被发现。然而,沿着这些途径,在较短尺度下有效尺寸变化的解释和物理意义尚不清楚。在这篇文章中,我们没有引用特定的模型,面对时空的有限分辨率(通常由量子引力暗示),盒计数维数显示了一种简单的方法,如何定性和定量的特点,这种效果可以理解。这样,我们得到了一个简单的时空维运行的解析表达式,这意味着牛顿平方反比定律的修正与来自单圈引力辐射修正的修正完全一致。

英文摘要:

Quantum-gravity renders the space-time dimension to depend on the size of region; it monotonically increases with the size of region and asymptotically approaches four for large distances. This effect was discovered in numerical simulations of lattice quantum gravity in the framework of causal dynamical triangulation [hep-th/0505113] as well as in renormalization group approach to quantum gravity [hep-th/0508202]. However, along these approaches the interpretation and the physical meaning of the effective change of dimension at shorter scales is not clear. Without invoking particular models in this essay we show that, box-counting dimension in face of finite resolution of space-time (generally implied by quantum gravity) shows a simple way how both the qualitative and the quantitative features of this effect can be understood. In this way we derive a simple analytic expression of space-time dimension running, which implies the modification of Newton's inverse square law in a perfect agreement with the modification coming from one-loop gravitational radiative corrections.

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