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arXiv 2004.13380hep-thcond-mat.other
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相对论流体力学中的拓扑模

Topological modes in relativistic hydrodynamics

Yan Liu, Ya-Wen Sun

摘要:

我们证明了相对论流体力学中的无隙模可以通过以特定的方式弱地打破能量守恒动量张量而变得拓扑非平凡。该系统在流体动力学模式的频谱中具有拓扑半金属状交叉节点,需要在两个空间方向上保护平移和提升对称性的特殊组合。我们确认的非平凡的拓扑结构从一个未定的Berry阶段的存在。这些能量动量非守恒项可以自然地由外部引力场产生,该引力场来自于从原始惯性系改变的参考系,即由非惯性参考系中的虚拟力产生。这个非惯性系是一个沿螺旋线轨迹运动的加速观察者的静止系。这表明,拓扑平凡模式可以通过在特殊的非惯性参考系中观察而变得非平凡,并且这一事实原则上可以在实验室中得到验证。最后,我们提出了这个系统的全息实现。

英文摘要:

We show that gapless modes in relativistic hydrodynamics could become topologically nontrivial by weakly breaking the conservation of energy momentum tensor in a specific way. This system has topological semimetal-like crossing nodes in the spectrum of hydrodynamic modes that require the protection of a special combination of translational and boost symmetries in two spatial directions. We confirm the nontrivial topology from the existence of an undetermined Berry phase. These energy momentum non-conservation terms could naturally be produced by an external gravitational field that comes from a reference frame change from the original inertial frame, i.e. by fictitious forces in a non-inertial reference frame. This non-inertial frame is the rest frame of an accelerating observer moving along a trajectory of a helix. This suggests that topologically trivial modes could become nontrivial by being observed in a special non-inertial reference frame, and this fact could be verified in laboratories, in principle. Finally, we propose a holographic realization of this system.

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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