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Information × Registration Number 0211U006288, 0109U004130 , R & D reports Title Study of collective phenomena in heavy ion collisions popup.stage_title Head Sinyukov Yuri Mikhailovich, Registration Date 09-03-2011 Organization Bogolyubov Institute of Theoretical Physics NAS of Ukraine popup.description2 We show that a hydrodynamical expansion leads in a natural way to the observed “ridge” structure in the two particle correlation function versus the pseudorapidity difference and the azimuthal angle difference, and this structure is extended over many units in pseudorapidity. The reason for this phenomenon is the fact that in high multiplicity proton-proton events many elementary flux tubes are produced, which represent an energy density which by accident usually deviates from an ideal cylindrical symmetry. This structure appears as a consequence of a longitunial invariant asymmetry of the energy density from overlapping flux tubes, which translates into longitudinal invariant elliptical flow The basic hydrokinetic code was modified to include the transversally bumping tube-like initial conditions with the aim to study how the initial fluctuations in the energy density evolve with time. We found that the effect of fluctuations of the initial conditions was not washed out during the system expansion. The evolution of the energy density distributions and velocity profiles are calculated in the framework of the 3D hydrodynamics. Possible physically grounded configurations of initial density profiles are studied. Product Description popup.authors Аккелін Сергій Валентинович Борисов Олександр Дмитрович Карпенко Юрій Олександрович Синюков Юрій Михайлович popup.nrat_date 2020-04-02 Close