Causality and relativistic effects in intranuclear cascade calculations

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Abstract
Two main goals are pursued in this work. The first one is concerned with the relativistic effects in high energy nuclear collisions, when noninvariance of simultaneity is taken into account. It is shown that the time ordering of nucleon-nucleon collisions is quite different for different observers, giving in some cases noninvariant final results for intranuclear cascade calculations. In particular, we have shown an example of such a case, in which the intranuclear cascade simulation, depending on the reference frame, presents a kind of density instability caused by a specific time ordering of collision events. The second one is to propose a new intranuclear cascade calculation, using a causality preserving scheme, which minimizes this kind of relativistic effect. It is verified that the causality preserving intranuclear cascade prescription essentially recovers the relativistic invariance.