Pair production in superconductors

cond-mat/0508529 (Los Alamos)

We show that an alternative theory of superconductivity recently proposed (theory of hole superconductivity) leads to the surprising consequence that real electron-positron pair production will occur for superconductors larger than a critical size. We discuss the expected magnitude of the effect and suggest experimental ways to verify it. Urgent attention to the possibility of harmful $\gamma-$radiation being emitted from superconductors out of equilibrium is called for.