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arXiv 1601.01430hep-thgr-qcquant-ph
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非对易几何与流体动力学

Noncommutative Geometry and Fluid Dynamics

Praloy Das, Subir Ghosh

摘要:

在本文中,我们开发了一个非交换(NC)推广的理想流体模型的第一性原理,在哈密顿框架。在拉格朗日(粒子)坐标空间括号中引入非交换性,导出欧拉(流体)场变量的诱导NC流体括号代数。与哈密顿量一起,该NC代数生成广义流体动力学,该广义流体动力学满足质量和能量的精确局部守恒定律,从而保持质量和能量守恒。然而,非平凡的NC校正项出现在电荷和能量通量。对NC流体的其他非相对论性时空对称性也进行了详细的讨论。这就构成了对数控流体运动学和动力学的研究。在第二部分中,我们基于本文提出的NC流体动力学,构造了Friedmann-Robertson-Walker(FRW)宇宙学模型的一个推广。我们概述了NC效应产生宇宙学扰动的方式,在模型中引入各向异性和不均匀性。我们还导出了一个NC扩展的Friedmann方程。

英文摘要:

In the present paper we have developed a Non-Commutative (NC) generalization of perfect fluid model from first principles, in a Hamiltonian framework. The noncommutativity is introduced at the Lagrangian (particle) coordinate space brackets and the induced NC fluid bracket algebra for the Eulerian (fluid) field variables is derived. Together with a Hamiltonian this NC algebra generates the generalized fluid dynamics that satisfies exact local conservation laws for mass and energy thereby maintaining mass and energy conservation. However, nontrivial NC correction terms appear in charge and energy fluxes. Other non-relativistic spacetime symmetries of the NC fluid are also discussed in detail. This constitutes the study of kinematics and dynamics of NC fluid. In the second part we construct an extension of Friedmann-Robertson-Walker (FRW) cosmological model based on the NC fluid dynamics presented here. We outline the way in which NC effects generate cosmological perturbations bringing in anisotropy and inhomogeneity in the model. We also derive a NC extended Friedmann equation.

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