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The decorrelation of the orientation of the event-plane angles in the initialstate of relativistic Pb-Pb and p-Pb collisions, the "torque effect," isstudied in a model of entropy deposition in the longitudinal directioninvolving fluctuations of the longitudinal source profile on large scales. Theradiation from a single wounded nucleon is asymmetric in space-time rapidity.It is assumed that the extent in rapidity of the region of deposited entropy israndom. Fluctuations in the deposition of entropy from each source increase theevent-plane decorrelation: for Pb-Pb collisions they improve the description ofthe data, while for p-Pb collisions the mechanism is absolutely essential togenerate any sizable decorrelation. We also show that the experimental data forrank-four flow may be explained via folding of the elliptic flow. The resultssuggest the existence of long range fluctuations in the space-time distributionof entropy in the initial stages of relativistic nuclear collisions.

The torque effect and fluctuations of entropy deposition in rapidity in ultra-relativistic nuclear collisions