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arXiv 1909.01698cond-mat.stat-mechnlin.SI
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一维等质量硬粒子气体中守恒量的动态相关性

Dynamical correlations of conserved quantities in the one-dimensional equal mass hard particle gas

International Centre for Theoretical Sciences, Tata Institute of Fundamental Research(国际理论科学中心,塔塔基础研究所);Raman Research Institute(拉曼研究所)

Aritra Kundu, Abhishek Dhar, Sanjib Sabhapandit

AI总结:

研究一维等质量硬粒子气体中守恒量的动态相关性,通过映射非相互作用气体计算时空相关函数,并验证其弹道标度特性。

摘要:

我们研究了一种在一维空间中具有硬核排斥的粒子气体,其中粒子在弹性碰撞之间自由运动。我们以均匀密度在无限线上准备系统。粒子的速度{v_i; i∈Z}独立地从热分布中选择。通过映射到非相互作用气体,我们分析地计算了平衡的时空相关函数⟨v_i^m(t) v_j^n(0)⟩,其中m,n为任意整数。分析结果通过哈密顿动力学的微观模拟得到验证。相关函数具有弹道标度,正如在可积模型中所预期的那样。

英文摘要:

We study a gas of point particles with hard-core repulsion in one dimension where the particles move freely in-between elastic collisions. We prepare the system with a uniform density on the infinite line. The velocities $\{v_i; i \in \mathbb{Z} \}$ of the particles are chosen independently from a thermal distribution. Using a mapping to the non-interacting gas, we analytically compute the equilibrium spatio-temporal correlations $\langle v_i^m(t) v_j^n(0)\rangle$ for arbitrary integers $m,n$. The analytical results are verified with microscopic simulations of the Hamiltonian dynamics. The correlation functions have ballistic scaling, as expected in an integrable model.

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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