Cimerman, J., Karpenko, I., Tomášik, B., & Huovinen, P. (2024). Next-generation multi-fluid hydrodynamic model for RHIC BES. arXiv preprint arXiv:2301.11894v2.
This paper presents a new hybrid event-by-event three-fluid hydrodynamic model, MUFFIN, designed to simulate heavy-ion collisions in the energy range relevant to the RHIC Beam Energy Scan program, aiming to improve the understanding of the Quark-Gluon Plasma (QGP) properties at these energies.
The model employs a multi-fluid approach, treating the colliding nuclei and the produced fireball as separate fluids interacting through friction terms. It utilizes a modified vHLLE code for hydrodynamic evolution in hyperbolic coordinates and incorporates event-by-event fluctuations in the initial state by randomly sampling nucleon positions. The model also features a realistic Equation of State and couples to the SMASH hadronic cascade for final-state interactions.
The paper demonstrates the model's capability to reproduce key experimental observables, such as transverse momentum spectra and rapidity distributions of charged hadrons, at various collision energies. It highlights the importance of the multi-fluid approach in capturing the dynamics of the collisions at lower energies, where the interpenetration time of the nuclei is comparable to the system's lifetime.
The authors conclude that MUFFIN provides a valuable tool for studying heavy-ion collisions at RHIC BES energies, offering improved sensitivity to the Equation of State and a more realistic description of the collision dynamics compared to traditional one-fluid models.
This research contributes to the ongoing effort to understand the properties of QGP, particularly in the energy regime relevant to the search for the QCD critical point. The development of MUFFIN provides a new and potentially more accurate tool for interpreting experimental data from RHIC BES and future experiments at similar energies.
The current version of MUFFIN relies on the perfect-fluid assumption and does not include viscous corrections. The authors plan to incorporate viscosity in future versions of the model. Further development and validation of the model with a wider range of experimental observables are also necessary.
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by Jakub Cimerm... om arxiv.org 10-10-2024
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