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arXiv 1509.05046hep-thmath-phmath.MPnucl-th
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流体力学、复苏和跨渐近性

Hydrodynamics, resurgence and trans-asymptotics

Gokce Basar, Gerald V. Dunne

摘要:

通过一个非线性常微分方程给出了经历助推不变展开的均匀共形等离子体的二阶流体动力学描述,研究了其复苏渐近性质,进一步发展了Heller和Spalinski [Phys. Rev. Lett. 115,072501(2015)]。复苏清楚地确定了非流体动力学模式,在后期的指数抑制,类似于引力语言中的准正常模式,组织这些模式的trans-series扩展。这些模式类似于半经典展开中的瞬子,其中阻尼率扮演瞬子作用的角色。我们发现,该系统显示的通用功能的复苏,这些非流体动力学模式的不同订单的波动之间的明确的定量关系。反式级数参数的虚部由斯托克斯常数确定,实部由与初始条件相关的自由度确定。

英文摘要:

The second-order hydrodynamical description of a homogeneous conformal plasma that undergoes a boost- invariant expansion is given by a single nonlinear ordinary differential equation, whose resurgent asymptotic properties we study, developing further the recent work of Heller and Spalinski [Phys. Rev. Lett. 115, 072501 (2015)]. Resurgence clearly identifies the non-hydrodynamic modes that are exponentially suppressed at late times, analogous to the quasi-normal-modes in gravitational language, organizing these modes in terms of a trans-series expansion. These modes are analogs of instantons in semi-classical expansions, where the damping rate plays the role of the instanton action. We show that this system displays the generic features of resurgence, with explicit quantitative relations between the fluctuations about different orders of these non-hydrodynamic modes. The imaginary part of the trans-series parameter is identified with the Stokes constant, and the real part with the freedom associated with initial conditions.

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