http://arxiv.org/abs/1811.03079
We show that the de Sitter quantum breaking bound when applied to QCD exposes the necessity of the axion solution to the strong CP problem. The Peccei-Quinn mechanism emerges as a consistency requirement independent of the naturalness questions. The $\theta$-angle must be unphysical rather than simply small. All other approaches including a fine-tuning of $\theta$ lead to the existence of de Sitter vacua and are excluded by consistency.
G. Dvali, C. Gomez and S. Zell
Thu, 8 Nov 18
17/72
Comments: 2 pages
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