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arXiv 2109.09496hep-thgr-qc
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用引力耦合近似序列实现与背景无关的场量子化II:度量涨落

Background Independent Field Quantization with Sequences of Gravity-Coupled Approximants II: Metric Fluctuations

Maximilian Becker, Martin Reuter

摘要:

我们应用Phys. Rev. D102(2020)125001中概述的新量子化方案来探索时空度规的量子真空涨落对量子爱因斯坦引力宇宙的影响,这被认为是一个有效的理论。该方案将背景独立性原理提升到量子场论的正则化前体(“近似”)的水平,并严格限制了可容许的正则化方案。在没有任何参数调整的情况下,我们发现在最大对称时空中线性引力子的零点振荡不会产生通常预期的截止曲率的宇宙学常数问题。相反,度量波动被发现减少正曲率任意微小,最终消失的值时,截止解除。这表明平坦空间可能是纯量子引力的独特基态。我们的研究结果与传统的信念相矛盾,这些信念是建立在背景依赖性计算的基础上的,因此,其有效性必须受到质疑。

英文摘要:

We apply the new quantization scheme outlined in Phys. Rev. D102 (2020) 125001 to explore the influence which quantum vacuum fluctuations of the spacetime metric exert on the universes of Quantum Einstein Gravity, which is regarded an effective theory here. The scheme promotes the principle of Background Independence to the level of the regularized precursors of a quantum field theory ("approximants") and severely constrains admissible regularization schemes. Without any tuning of parameters, we find that the zero point oscillations of linear gravitons on maximally symmetric spacetimes do not create the commonly expected cosmological constant problem of a cutoff-size curvature. On the contrary, metric fluctuations are found to reduce positive curvatures to arbitrarily tiny and ultimately vanishing values when the cutoff is lifted. This suggests that flat space could be the distinguished groundstate of pure quantum gravity. Our results contradict traditional beliefs founded upon background-dependent calculations whose validity must be called into question therefore.

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