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arXiv · 2508.05292

A Resummed Hydrodynamic Description of Relativistic Heavy-ion Collisions

Cheng Chiu·Gabriel Denicol·Matthew Luzum·Chun Shen
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Abstract

We introduce a resummed hydrodynamic scheme for evolving the viscous stress tensors in relativistic viscous hydrodynamics, based on which the necessary non-linear causality conditions can be imposed. When the magnitudes of the shear and bulk viscous stress tensors are small relative to the ideal part energy-momentum tensor, this new resummed scheme reduces to the standard second-order relativistic hydrodynamic theories. Nontrivial nonlinear corrections from high-order gradient terms retain the sizes of shear and bulk viscous stress tensors within tunable maximum allowed values. We perform event-by-event simulations for Pb+Pb and p+Pb collisions at 5.02 TeV to quantify the theoretical uncertainties from this resummed scheme on final-state flow observables.

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Cheng Chiu, Gabriel Denicol, Matthew Luzum, Chun Shen. 2025-08-07. A Resummed Hydrodynamic Description of Relativistic Heavy-ion Collisions. https://arxiv.org/abs/2508.05292

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