Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-29
Physics
High Energy Physics
High Energy Physics - Phenomenology
poster presented at "Quark Matter 2004" (Oakland, CA), Jan. 13, 2004
Scientific paper
Parton cascade models have been surprisingly successful in describing heavy-ion reactions at RHIC energies -- surprising because in spite of their QCD bells and whistles, they essentially embody classical many-particle dynamics. The procedure to determine the sequence of the binary parton interactions, however -- an essential aspect of all such models -- is by necessity a phenomenological (and somewhat arbitrary) feature of these codes. This has been recognized early on as a serious drawback of non-covariant cascade models. While in the Poincare-Covariant Parton Cascade code "pcpc" the interaction sequence is determined covariantly and thus is independent of the frame of reference in which the code is run, this alone does not solve the basic causality problems raised by such classical models. We discuss in detail all aspects of (Einstein) causality encountered in such parton cascade models.
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