EPJ Web Conf.
Volume 276, 2023The 20th International Conference on Strangeness in Quark Matter (SQM 2022)
|Number of page(s)||4|
|Published online||01 March 2023|
Causality violations in realistic simulations of relativistic nuclear collisions
Illinois Center for Advanced Studies of the Universe, Department of Physics, University of Illinois at Urbana-Champaign,
2 Department of Physics, Pepperdine University, Malibu, CA 90263, USA
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Published online: 1 March 2023
We show that relativistic causality is violated in the early stages of state-of-the-art heavy-ion hydrodynamic simulations of nuclear collisions. Up to 75% of the initial fluid cells violate nonlinear causality constraints, while superluminal propagation is observed by up to 15% the speed of light. Only after 2-3 fm/c of evolution, do 50% of the fluid cells become definitely causal. Inclusion of pre-equilibrium evolution significantly reduces the number of acausal cells, but it does not eliminate them. Relativistic causality thus imposes constraints on the model parameter space of heavy-ion collision simulations.
© The Authors, published by EDP Sciences, 2023
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