QED vacuum has interesting and complex properties. In QED vacuum, the electric and magnetic fields have zero average values, but their variances are not zero. As a result, QED vacuum contains vacuum fluctuations (virtual particles that hop into and out of existence), and a finite energy called vacuum energy. Vacuum fluctuations are an essential and ubiquitous part of quantum field theory. Some experimentally verified effects of vacuum fluctuations include <answer>spontaneous emission</answer> and the Lamb shift. Coulomb's law and the electric potential in vacuum near an electric charge are modified.
What is a verified effect of vacuum fluctuation?
spontaneous emission