来自增强流体动力学的近光锥非流体动力学结构
Near-Light-Cone Nonhydrodynamic Structure from Boosted Hydrodynamics
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中文总结 AI 辅助
研究流体动力学长波长展开中推进对非流体动力学奇点的影响，表明大推进下相关奇点源于近光锥区域，去除洛伦兹因子增长后收敛尺度由微观谱结构控制，通过弛豫时间动力学理论和全息术举例证明。
中文摘要 AI 辅助
流体动力学为长波长多体系统提供了通用描述。其长寿命集体激发即流体动力学模式，允许长波长展开，其收敛性由热平衡中守恒量的推迟关联函数的解析结构编码。我们表明，一个推进可以改变限制这种展开的非流体动力学奇点。在大推进时，相关奇点源于静止系谱的大动量、近光锥区域。去除洛伦兹因子增长后，重新标度的收敛尺度由理论的微观谱结构控制。我们在弛豫时间动力学理论和全息术这两个例子中明确证明了这一点。
英文摘要
Hydrodynamics provides a universal description of many-body systems at long wavelengths. Its long-lived collective excitations, known as hydrodynamic modes, admit long-wavelength expansions whose convergence is encoded in the analytic structure of retarded correlators of conserved quantities in thermal equilibrium. We show that a boost can change which nonhydrodynamic singularity limits such an expansion. In the large-boost limit, the relevant singularity originates in the large-momentum, near-light-cone region of the rest-frame spectrum. After factoring out the Lorentz-factor growth, the rescaled convergence scale is controlled by the microscopic spectral structure of the theory. We explicitly demonstrate this in two examples: relaxation-time kinetic theory and holography.
