Quasilumps from first order phase transitions
  We investigated the bubble collisions during the first order phase transitions. Numerical results indicate that within the certain range of parameters the collision of two bubbles leads to formation of separate relatively long-lived quasilumps - configurations filled with scalar field oscillating around the true vacuum state. Energy is perfectly localized, and density is slightly pulsating around its maximum. This process is accompanied by radiation of scalar waves. 
I. Dymnikova (1), L. Koziel (2), M. Khlopov (2,3), S. Rubin (2,3) ((1)   Institute of Mathematics, Informatics and Physics, ...