Nonconformal kinetic theory with transverse dynamics and event-by-event simulations using CoMBolt-RTA
Abstract
A new version of CoMBolt, called CoMBolt-RTA, is introduced to solve the Boltzmann equation for massive quasiparticles in the relaxation time approximation (RTA). The inclusion of a constant quasiparticle mass allows one to obtain an equation of state (EOS) closer to that of lattice QCD. The nonequilibrium dynamics of a boost-invariant, nonconformal system with transverse spatial extension are studied, with particular emphasis on the effects of quasiparticle mass on the evolution toward equilibrium. Using the hybrid version, which includes TrENTo for the initial state and UrQMD as an afterburner, the model parameters are manually tuned to describe recent anisotropic-flow and charged-multiplicity measurements in OO collisions by the ALICE Collaboration. The resulting predictions for the pT-spectrum and ⟨ pT⟩ are also compared with ATLAS measurements. Based on the preferred parameter tuning, the collective response as a function of opacity is investigated. The results suggest that central OO collisions remain in the fluid-like regime, while smaller systems, namely 3He-3He and 4He-4He collisions, could provide a better opportunity to investigate the transition from fluid-like to particle-like collective dynamics.
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BibTeX
@misc{taghavi2026nonconformal,
title = {{Nonconformal kinetic theory with transverse dynamics and event-by-event simulations using CoMBolt-RTA}},
author = {Seyed Farid Taghavi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.31611},
eprint = {2610.31611},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.31611},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Nonconformal kinetic theory with transverse dynamics and event-by-event simulations using CoMBolt-RTA
AU - Seyed Farid Taghavi
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.31611
UR - https://arxiv.org/abs/2610.31611
AB - A new version of CoMBolt, called CoMBolt-RTA, is introduced to solve the Boltzmann equation for massive quasiparticles in the relaxation time approximation (RTA). The inclusion of a constant quasiparticle mass allows one to obtain an equation of state (EOS) closer to that of lattice QCD. The nonequilibrium dynamics of a boost-invariant, nonconformal system with transverse spatial extension are studied, with particular emphasis on the effects of quasiparticle mass on the evolution toward equilibrium. Using the hybrid version, which includes TrENTo for the initial state and UrQMD as an afterburner, the model parameters are manually tuned to describe recent anisotropic-flow and charged-multiplicity measurements in OO collisions by the ALICE Collaboration. The resulting predictions for the p_T-spectrum and ⟨ p_T⟩ are also compared with ATLAS measurements. Based on the preferred parameter tuning, the collective response as a function of opacity is investigated. The results suggest that central OO collisions remain in the fluid-like regime, while smaller systems, namely ^3He-^3He and ^4He-^4He collisions, could provide a better opportunity to investigate the transition from fluid-like to particle-like collective dynamics.
ER -