Rajeev Singh, Gabriel Sophys, Radoslaw Ryblewski
Evolution of spin polarization in the Gubser-expanding conformal perfect-fluid hydrodynamic background is studied. The analysis of the conformal transformation properties of the conservation laws is extended to the case of the angular momentum conservation. The explicit forms of equations of motion for spin components are derived and analysed, and some special solutions are found.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
Local Spin Polarization in Anisotropic Gubser Flow: Suppression Mechanism and Formulation Dependence
本文通过解析研究相对论重离子碰撞中的纵向自旋极化，揭示了热涡度与热剪切对自旋极化的抵消机制，以及参考单位矢量的选择会影响自旋极化符号的公式依赖性。
Spin hydrodynamics on a hyperbolic expanding background
研究了在双曲κ=-1流背景下的自旋流体动力学，发现其自旋动力学具有更强的局部化和独特的振荡特性。
Due to the absence of a transverse expansion with respect to the beam direction, the Bjorken flow is unable to describe certain observables in heavy ion collisions. This caveat has motivated the introduction of analytical relativistic hydrodynamics (RH) solutions with transverse expansion, in particular, the 3+1 self-similar (SSF) and Gubser flows. Inspired by recent generalizations of the Bjorken flow to the relativistic magnetohydrodynamics (RMHD), we present a procedure for a generalization of RH solutions to RMHD. Our method is mainly based on symmetry arguments. Using this method, we find…
Finite-Density Dynamics of Chemically Equilibrating QGP in Conformal Gubser Flow and Hard Thermal Photon Production
研究相对论重离子碰撞中共形Gubser流下有限重子密度QGP的化学平衡，通过逸度参数耦合流体动力学，分析有限密度和横向膨胀对化学平衡的延迟效应及其对硬热光子产生的影响。
Superfluids in expanding backgrounds and attractor times
本文研究了在重离子碰撞实验和宇宙学相关膨胀背景下，非平衡超流体的行为，特别是通过Müller-Israel-Stewart理论中U(1)Goldstone模式与流体动力学模式的耦合，探讨了在合适初始条件下，Goldstone模式势能的变化导致对称性自发破缺，以及吸引时间的定义和其对初始条件的依赖性。
We use symmetry arguments developed by Gubser to construct the first radially-expanding explicit solutions of the Israel-Stewart formulation of hydrodynamics. Along with a general semi-analytical solution, an exact analytical solution is given which is valid in the cold plasma limit where viscous effects from shear viscosity and the relaxation time coefficient are important. The radially expanding solutions presented in this paper can be used as nontrivial checks of numerical algorithms employed in hydrodynamic simulations of the quark-gluon plasma formed in ultra-relativistic heavy ion collis…
Spin polarization of an expanding and rotating system
本文利用含非局域弛豫时间近似的自旋动理学理论，推导纵向膨胀且横向旋转的有质量 spin-1/2 相对论流体自旋矩的封闭运动方程，揭示晚期速度与温度梯度对极化的贡献。
Evolution of spin polarization in the presence of external electric field is studied for collision energies $\sqrt{s_{\rm NN}}=27\,{\rm GeV}$ and $\sqrt{s_{\rm NN}}=200\,{\rm GeV}$. The numerical analysis is done in the perfect-fluid Bjorken-expanding resistive magnetohydrodynamic background and novel results are reported. In particular, we show that the electric field plays a significant role in the competition between expansion and dissipation.
Tensor spin polarization induced by curved freeze-out hypersurface
研究相对论重离子碰撞中冻结出超曲面的曲率如何极化矢量玻色子，通过梯度展开得到协变自旋极化张量，并估计φ介子自旋排列的曲率贡献为-10^{-4}至-10^{-3}，小系统中效应增强。
Shear induced cavitation in radially expanding, chemically equilibrating QGP
本研究首次在化学非平衡QGP中结合横向膨胀研究剪切粘度诱导的空化，确定临界剪切粘度，并约束其值需避免空化，且JETSCAPE提取值低于该临界值。
We present a formalism for analyzing a full-sky temperature and polarization map of the cosmic microwave background. Temperature maps are analyzed by expanding over the set of spherical harmonics to give multipole moments of the two-point correlation function. Polarization, which is described by a second-rank tensor, can be treated analogously by expanding in the appropriate tensor spherical harmonics. We provide expressions for the complete set of temperature and polarization multipole moments for scalar and tensor metric perturbations. Four sets of multipole moments completely describe isotr…
Polarization dynamics from moment equations
该研究从自旋动力学理论推导有质量粒子膨胀系统的局域横向极化表达式，建立自旋矩的封闭运动方程组，以描述从自由流动到局域平衡的全过程并用于重离子碰撞极化研究。
Using a covariant and angular-momentum-conserved chiral transport model, which takes into account the spin-orbit interactions of chiral fermions in their scatterings via the side jumps, we study the quark spin polarization in quark matter. For a system of rotating and unpolarized massless quarks in an expanding box, we find that side jumps can dynamically polarize the quark spin and result in a final quark spin polarization consistent with that of thermally equilibrated massless quarks in a self-consistent vorticity field. For the quark matter produced in noncentral relativistic heavy ion coll…
Digit quantum simulation of a fermion field in an expanding universe
本研究通过数字量子模拟探讨了费米场在膨胀宇宙中的演化，利用约尔丹-威金斯变换和 Trotter 扩展分析了费米子数密度、关联函数等特性，并揭示了动量红移导致的扩散现象。
Heavy-quark spin precession as a magnetic field chronometer
提出利用重夸克自旋进动作为探针，通过测量粲和底夸克极化劈裂来量化相对论性重离子碰撞中磁场的寿命和分布，为研究夸克-胶子等离子体提供新手段。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。