A comment on "How the cosmological constant is hidden by Planck scale curvature fluctuations''

Abstract

A recent preprint by Wang and Unruh [arXiv:1911.06110] contains a number of criticisms of my paper, "Hiding the cosmological constant" [Phys. Rev. Lett. 123 (2019) 131302, arXiv:1809.08277]. While Wang and Unruh suggest an interesting alternative scenario and raise an important conceptual question, most of their criticisms are incorrect, in part because of misunderstandings about averaging and about the nature of the "foamy" spacetimes considered in my paper.