a. Virtual photons arenu2019t about u201cincompletenessu201d in quantum mechanics. Theyu2019re predictions of the existing theory of quantum mechanics. Quantum mechanics wouldnu2019t work if they werenu2019t there.2. Dark energy isnu2019t an incompleteness of quantum mechanics. If anything, itu2019s an incompleteness of general relativity, which is the only theory applicable to large-scale observations of the structure of the universe.iii. There are many areas in QM we might call u201cincompleteu201d, like how it unifies with gravity and how symmetries are broken to yield macroscopic behavior. Neither virtual photons nor dark energy are implicated.