Interplay of friction and noise and enhancement of disoriented chiral   condensate
  Using the Langevin equation for the linear $\sigma$ model, we have investigated the effect of friction and noise on the possible disoriented chiral condensate formation. Friction and noise are supposed to suppress longwavelength oscillations and growth of disoriented chiral condensate domains. Details simulation shows that for heavy ion collisions, interplay of friction and noise occur in such a manner that formation of disoriented chiral condensate domains are enhanced. 
A. K. Chaudhuri