Gravitational Radiation by Cosmic Strings in a Junction
  The formalism for computing the gravitational power radiation from excitations on cosmic strings forming a junction is presented and applied to the simple case of co-planar strings at a junction when the excitations are generated along one string leg. The effects of polarization of the excitations and of the back-reaction of the gravitational radiation on the small scale structure of the strings are studied. 
Robert Brandenberger, Hassan Firouzjahi, Johanna Karouby, Shahram   Khosravi