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arXiv 0903.2048hep-thcond-mat.stat-mechgr-qc
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永恒暴胀的共形场论

A Conformal Field Theory for Eternal Inflation

Ben Freivogel, Matthew Kleban

摘要:

我们研究了一个由任意维d上重叠球面的共形不变分布所定义的统计模型。该模型的出现作为宇宙气泡在d+1维de Sitter空间中的渐近分布,也作为气泡与基准“观测气泡”的畴壁碰撞在d+2维de Sitter空间中的渐近分布。本文用解析方法计算了d=2时“泡数算子”指数的2点、3点和4点关联函数。我们发现,当仔细定义,这些反射器是免费的红外发散,协变下的全球共形群,电荷守恒,并与正的共形尺寸,在一个新的方式有关的电荷变换。虽然这些算符本身可能并不能定义一个完整的共形场论,但人们可以用球上的配分函数来计算二维情形下的近似中心荷。当气泡的成核速率很大时,任何尺度的理论都有一个无相互作用的极限。二维理论与某些连续渗流模型有关,但它对所有隧穿速率值都是保形的。

英文摘要:

We study a statistical model defined by a conformally invariant distribution of overlapping spheres in arbitrary dimension d. The model arises as the asymptotic distribution of cosmic bubbles in d+1 dimensional de Sitter space, and also as the asymptotic distribution of bubble collisions with the domain wall of a fiducial "observation bubble" in d+2 dimensional de Sitter space. In this note we calculate the 2-,3-, and 4-point correlation functions of exponentials of the "bubble number operator" analytically in d=2. We find that these correlators, when carefully defined, are free of infrared divergences, covariant under the global conformal group, charge conserving, and transform with positive conformal dimensions that are related in a novel way to the charge. Although by themselves these operators probably do not define a full-fledged conformal field theory, one can use the partition function on a sphere to compute an approximate central charge in the 2D case. The theory in any dimension has a noninteracting limit when the nucleation rate of the bubbles in the bulk is very large. The theory in two dimensions is related to some models of continuum percolation, but it is conformal for all values of the tunneling rate.

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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