自调节宇宙学常数的引力机制：障碍和前进的道路
Gravitational Mechanisms to Self-Tune the Cosmological Constant: Obstructions and Ways Forward
摘要：
自调谐的引力模型是指真空能量对时空曲率没有可观测的影响，即使它在截止值以下是先验未被抑制的。我们补充温伯格的不去定理，通过研究场论完成的自我调整，允许破碎的翻译以及其他概括，并确定新的障碍。我们的分析使用了一个非常普遍的Kallen-Lehmann光谱表示的能量动量守恒源的交换振幅，并利用么正性和洛伦兹不变性表明，从自调谐的长波长源的过渡到近广义相对论在较短的尺度上是一般不可能的。我们寻找新的方法来绕过我们的障碍，并强调两种有趣的可能性。第一个例子是一个酉场配置反德西特空间与所需的过渡，从自调整到GR。第二个例子是出于真空能量隔离。
英文摘要：
Gravitational models of self-tuning are those in which vacuum energy has no observable effect on spacetime curvature, even though it is a priori unsuppressed below the cut-off. We complement Weinberg's no go theorem by studying field theoretic completions of self-adjustment allowing for broken translations as well as other generalisations, and identify new obstructions. Our analysis uses a very general Kallen-Lehmann spectral representation of the exchange amplitude for conserved sources of energy-momentum and exploits unitarity and Lorentz invariance to show that a transition from self-tuning of long wavelength sources to near General Relativity on shorter scales is generically not possible. We search for novel ways around our obstructions and highlight two interesting possibilities. The first is an example of a unitary field configuration on anti-de Sitter space with the desired transition from self-tuning to GR. A second example is motivated by vacuum energy sequestering.
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。
