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arXiv 0906.2937gr-qcastro-ph.COastro-ph.EPastro-ph.GAphysics.space-ph
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太阳系中的MOND外场效应

On the MOND External Field Effect in the Solar System

Lorenzo Iorio

摘要:

在修正的牛顿动力学(MOND)框架下,嵌入较大引力系统S中的引力系统s的内部动力学受到S的外部背景场E的影响,即使它是恒定的和均匀的,这意味着违反强等效原理:这就是所谓的外部场效应(EFE)。在太阳系中,由于它在银河系中的运动,E为A_cen \approx 10^-10 m s^-2:它比行星的主要牛顿动量项小几个数量级。在这里,我们纯粹以现象学的方式解决以下问题:太阳的行星是否受到10^-10 m s^-2的EFE的影响?是否可以假定,由于其规模相对较小,其影响对它们来说可以忽略不计?$\bds E$在典型的太阳系行星轨道周期上的恒定性是否会导致净轨道效应消失?事实证明,恒定和均匀的加速度,微扰处理,不诱导非零的长周期轨道上的近心经度的测试粒子的影响。对于E \approx为10^-10 m s^-2的太阳系内行星,它们比E. V. Pitjeva最近利用太阳系重心坐标系中的天文历表获得的非标准近日点岁差的上界大4-6个数量级。E分量的上限为E_x <= 1 x 10^-15 m s^-2,E_y <= 2 x 10^-16 m s^-2,E_z <= 3 x 10^-14 m s^-2。这一结果与MOND对强等价原理的违背是一致的。

英文摘要:

In the framework of the MOdified Newtonian Dynamics (MOND), the internal dynamics of a gravitating system s embedded in a larger one S is affected by the external background field E of S even if it is constant and uniform, thus implying a violation of the Strong Equivalence Principle: it is the so-called External Field Effect (EFE). In the case of the solar system, E would be A_cen\approx 10^-10 m s^-2 because of its motion through the Milky Way: it is orders of magnitude smaller than the main Newtonian monopole terms for the planets. We address here the following questions in a purely phenomenological manner: are the Sun's planets affected by an EFE as large as 10^-10 m s^-2? Can it be assumed that its effect is negligible for them because of its relatively small size? Does $\bds E$ induce vanishing net orbital effects because of its constancy over typical solar system's planetary orbital periods? It turns out that a constant and uniform acceleration, treated perturbatively, does induce non-vanishing long-period orbital effects on the longitude of the pericenter of a test particle. In the case of the inner planets of the solar system and with E\approx 10^-10 m s^-2, they are 4-6 orders of magnitude larger than the present-day upper bounds on the non-standard perihelion precessions recently obtained with by E.V. Pitjeva with the EPM ephemerides in the Solar System Barycentric frame. The upper limits on the components of E are E_x <= 1 x 10^-15 m s^-2, E_y <= 2 x 10^-16 m s^-2, E_z <= 3 x 10^-14 m s^-2. This result is in agreement with the violation of the Strong Equivalence Principle by MOND.

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