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arXiv 1301.7652gr-qcastro-ph.COmath.DG
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相对论芬斯勒几何

Relativistic Finsler geometry

A. P. Kouretsis, M. Stathakopoulos, P. C. Stavrinos

摘要:

简要回顾了Finsler几何中平行位移的一些基本概念。在广义相对论中,物体沿着基本观察者的一致性平行平移对应于时间上的演化。通过放弃对无穷小距离的测量的二次限制,将几何推广到Finsler结构。除了曲率,流形的一个新性质使几何动力学复杂化,即颜色。颜色带来了内在的局部各向异性,许多量取决于位置和“支持”方向。我们讨论了这种方向依赖性和一些物理解释。此外,我们强调,在芬斯勒几何的平行位移不一定总是沿着“支持”的方向。后者是流形的一个基本同余,并导致一个自然的1+3分解。它的内部变形是通过涡量、剪切和膨胀的不可约分量的演化给出的。

英文摘要:

We briefly review some basic concepts of parallel displacement in Finsler geometry. In general relativity, the parallel translation of objects along the congruence of the fundamental observer corresponds to the evolution in time. By dropping the quadratic restriction on the measurement of an infinitesimal distance, the geometry is generalized to a Finsler structure. Apart from curvature a new property of the manifold complicates the geometrodynamics, the color. The color brings forth an intrinsic local anisotropy and many quantities depend on position and to a "supporting" direction. We discuss this direction dependence and some physical interpretations. Also, we highlight that in Finsler geometry the parallel displacement isn't necessarily always along the "supporting" direction. The latter is a fundamental congruence of the manifold and induces a natural 1+3 decomposition. Its internal deformation is given through the evolution of the irreducible components of vorticity, shear and expansion.

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