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报告题目：Recent results in spin hydrodynamics and stochastic fluid dynamics

报告嘉宾：Rajeev Singh 罗马尼亚奥拉蒂米斯西部大学 博士后

报告时间：2025年7月14日 14:00

Zoom会议：864 6219 1335

密码：3TaApR

主持人：宋维民

报告摘要

Since the first positive measurement of the Lambda-hyperon global spin polarization in heavy-ion collisions by STAR in 2017 [Nature 548 (2017) 62-65], the understanding of the nature of this phenomenon is one of the most intriguing challenges for the community. As relativistic fluid dynamics celebrates multiple successes in describing collective dynamics of the QCD matter in such reactions [Ann.Rev.Nucl.Part.Sci. 63 (2013) 123-151], the natural question arises whether the spin dynamics can also be modeled in such a framework. In this talk, the motivation for and recent outcomes of the experimental hunt for the macroscopic footprints of quantum spin in the relativistic heavy-ion collisions will be presented and the theoretical challenges connected with formulating its collective description will be discussed. We will also describe a unique formulation of relativistic viscous fluid dynamics based on the density frame. The equations of motion are strictly first order in time and have no non-hydrodynamic modes. These equations of motion can be obtained using a field redefinition from the Landau frame. The only fields are the energy and momentum densities $T^{0\mu}$ and the only parameters are the equilibrium equation state and the shear and bulk viscosities. We then compare our numerical results to QCD kinetic theory simulations for a set of one dimensional tests -- we find excellent agreement within the regime of applicability of hydrodynamics, and the simulation is well behaved even outside of this regime. The results are also compared to a hydro formulation developed by Bemfica, Disconzi, Noronha, and Kovtun (BDNK) as well as to second-order hydrodynamics as implemented in MUSIC.

嘉宾简介

Rajeev Singh，罗马尼亚奥拉蒂米斯西部大学博士后。2022年在波兰科学院核物理研究所获得理论物理学博士，后在美国石溪大学核理论中心做博士后研究。主要研究方向为自旋相对论流体力学。

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成人视频

成人视频 理论物理中心