How particles can emerge in a relativistic version of Bohmian Quantum   Field Theory
  It is shown how bosonic material particles can emerge from a covariant formulation of de Broglie-Bohm theory. The formulation is based on the work of Nikolic. Material particles are continuous fields, formed as the eigenvalue of the Schrodinger field operator, evaluated along a Bohmian trajectory. 
T. Mark Harder
quant-ph