Nucleus Driven Electronic Pulsation
  We derive and solve by the spectral method the equations for a neutral system of ultra-relativistic electrons that are compressed to the radius of the nucleus and subject to a driving force. This driving force can be thought of as originating from a nuclear breathing mode, a possibility we discuss in detail. 
H. Ludwig, R. Ruffini, and S.-S. Xue
physics.plasm-ph astro-ph.HE