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arXiv 2212.02451nucl-thhep-phhep-th
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膨胀等离子体的度规各向异性与非平衡吸引子

Metric anisotropies and nonequilibrium attractor for expanding plasma

Nisarg Vyas, Sunil Jaiswal, Amaresh Jaiswal

AI总结:

该研究针对Bianchi I型度规的各向异性时空,从弛豫时间近似Boltzmann方程推导各向异性流体力学框架,分析轴对称Kasner度规下近平衡与远离平衡区的吸引子行为,探究膨胀几何的影响及相对论重离子碰撞中的意义。

摘要:

我们研究了Bianchi I型度规描述的各向异性时空中无电荷无质量粒子系统的演化。针对轴对称情形,我们从弛豫时间近似下的Boltzmann方程出发,推导了各向异性流体力学框架。我们考虑轴对称Kasner度规的情形,研究了近平衡和远离平衡区域中系统向涌现吸引子趋近的过程。此外,通过放宽度规系数的Kasner条件,我们研究了膨胀几何对远离平衡吸引子的影响,并讨论了其在相对论重离子碰撞背景下的意义。

英文摘要:

We consider the evolution of a system of chargeless and massless particles in an anisotropic space-time given by the Bianchi type I metric. Specializing to the axis-symmetric case, we derive the framework of anisotropic hydrodynamics from the Boltzmann equation in the relaxation-time approximation. We consider the case of the axis-symmetric Kasner metric and study the approach to the emergent attractor in near and far-off-equilibrium regimes. Further, by relaxing the Kasner conditions on metric coefficients, we study the effect of expansion geometries on the far-off-equilibrium attractor and discuss its implications in the context of relativistic heavy-ion collisions.

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。

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