全球真空能量封存研究
An Etude on Global Vacuum Energy Sequester
摘要：
最近，两位作者提出了一种真空能量隔离机制，作为保护可观测宇宙学常数不受量子辐射修正的一种手段。最初的提议是基于使用全局拉格朗日乘数，但后来提供了局部公式。随后，其他有趣的说法，一个不同的非本地的方法来解决宇宙学常数的问题，再次根据全球拉格朗日乘子。我们研究了其中的一些建议，并找到了它们之间的相互关系。我们解释说，建议不治疗的宇宙学常数作为一个动力学变量的反项需要微调有可接受的解决方案。此外，反项经常需要在环膨胀中的每一阶被重新调谐，以抵消对宇宙学常数的辐射修正，就像在标准GR中一样。这些观察结果是一个重要的提醒，提醒我们真空能量隔离的建议是如何避免这些问题的。
英文摘要：
Recently two of the authors proposed a mechanism of vacuum energy sequester as a means of protecting the observable cosmological constant from quantum radiative corrections. The original proposal was based on using global Lagrange multipliers, but later a local formulation was provided. Subsequently other interesting claims of a different non-local approach to the cosmological constant problem were made, based again on global Lagrange multipliers. We examine some of these proposals and find their mutual relationship. We explain that the proposals which do not treat the cosmological constant counterterm as a dynamical variable require fine tunings to have acceptable solutions. Furthermore, the counterterm often needs to be retuned at every order in the loop expansion to cancel the radiative corrections to the cosmological constant, just like in standard GR. These observations are an important reminder of just how the proposal of vacuum energy sequester avoids such problems.
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