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A numerical evidence for the universality of the bound-zone peculiar velocityprofile in a LambdaCDM universe is presented. Analyzing the dark matter halocatalogs from the Millennium-II simulation, we determine the average peculiarvelocity profiles of the objects located in the bound zones around massivegroup-size halos at various redshifts and compare them to an analytic formulacharacterized by two parameters, the amplitude and slope of the profile. Thebest-fit values of the two parameters are found to be robust against thechanges of the mass scales and the key cosmological parameters. It is alsofound that the amplitude and slope parameters of the bound-zone peculiarvelocity profile are constant but only in the limited ranges of redshifts. Inthe dark matter dominated epoch corresponding to z> 0.6 the two parameters haveconstant values. In the transition period corresponding to 0.2=< z=< 0.6 whenthe density of Lambda begins to exceed that of dark matter the two parametersgrow almost linearly with redshifts. At later epochs z<0.2 when theLambda-domination prevails the two parameters regain constancy settling uponhigher constant values. Noting that the length of the transition period dependson the amount of Lambda and speculating that the linear evolution of theprofile with redshifts in the transition period is a unique feature of theLambda-dominated universe, we suggest that the redshift evolution of thebound-zone peculiar velocity profile should be a powerful local discriminatorof dark energy candidates.

On the Universality of the Bound-Zone Peculiar Velocity Profile