Can MOND take a bullet? Analytical comparisons of three versions of MOND beyond spherical symmetry
Can MOND take a bullet? Analytical comparisons of three versions of MOND beyond spherical symmetry
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DOI：
10.1111/j.1365-2966.2006.10668.x
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发表时间：
2006-06
影响因子：
4.8
通讯作者：
G. Angus;B. Famaey;HongSheng Zhao
中科院分区：
文献类型：
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作者：
G. Angus;B. Famaey;HongSheng Zhao
在非平凡几何系统中对修正牛顿动力学（MOND）的正确测试取决于对其假设理论的多个版本中的细微差异进行建模。对于具有典型引力 a0 尺度的勉强维利亚化的星系团的透镜效应和动力学尤其如此。当我们偏离球对称性时，原始 MOND 公式、泊松方程的经典单场修正以及 Bekenstein 的多场广义相对论（张量-矢量-标量，TeVeS）都会导致不同的预测。在本文中，我们研究了一类具有半赫恩奎斯特重子剖面的系统的 MONDian 分析模型。在提出球面极限内重子的解析分布函数后，我们开发了非球面几何模型的轨道和引力透镜。特别是，我们可以生成一个具有微弱透镜信号的多中心重子系统，类似于合并星系团 1E 0657-56 的子弹状光分布。最后，我们提出了解析的无标度高度非球形模型，以显示单场经典 MOND 理论和多场 TeVeS 理论之间的细微差别。 © 2006 RAS。
A proper test of modified Newtonian dynamics (MOND) in systems of non-trivial geometries depends on modelling subtle differences in several versions of its postulated theories. This is especially true for lensing and dynamics of barely virialized galaxy clusters with typical gravity of scale a0. The original MOND formula, the classical single-field modification of the Poisson equation, and the multifield general relativistic theory of Bekenstein (tensor-vector-scalar, TeVeS) all lead to different predictions as we stray from spherical symmetry. In this paper, we study a class of analytical MONDian models for a system with a semi-Hernquist baryonic profile. After presenting the analytical distribution function of the baryons in spherical limits, we develop orbits and gravitational lensing of the models in non-spherical geometries. In particular, we can generate a multicentred baryonic system with a weak lensing signal resembling that of the merging galaxy cluster 1E 0657-56 with a bullet-like light distribution. We finally present analytical scale-free highly non-spherical models to show the subtle differences between the single-field classical MOND theory and the multifield TeVeS theory. © 2006 RAS.