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arXiv · 2509.04431

Extended applicability domain of viscous anisotropic hydrodynamics in (2+1)-D Bjorken flow with transverse expansion

Yiyang Peng·Victor E. Ambrus·Clemens Werthmann·Sören Schlichting·Ulrich Heinz·Huichao Song
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Abstract

We perform (2+1)-D simulations of viscous anisotropic hydrodynamics (VAH) under boost-invariant and conformal conditions. Comparing both VAH and traditional viscous hydrodynamics with kinetic theory in the relaxation-time approximation as the underlying microscopic theory, we show that VAH provides a superior description of the evolution across a wide range of opacity, effectively extending the applicability of hydrodynamic modeling. Our results demonstrate VAH's potential for describing collective flow in small systems where traditional hydrodynamics faces challenges.

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Yiyang Peng, Victor E. Ambrus, Clemens Werthmann, Sören Schlichting, Ulrich Heinz, Huichao Song. 2026-04-14. Extended applicability domain of viscous anisotropic hydrodynamics in (2+1)-D Bjorken flow with transverse expansion. https://doi.org/10.1103/gbpd-m1mh

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