Electroweak Baryogenesis with Electroweak Strings
  If stable electroweak strings are copiously produced during the electroweak phase transition, they may contribute significantly to the presently observed baryon to entropy ratio of the Universe. This analysis establishes the feasibility of implementing an electroweak baryogenesis scenario without a first order phase transition. 
Robert H. Brandenberger (Brown) and Anne-Christine Davis (DAMTP,   Cambridge)