arXiv 1810.030282018-10-13hep-thastro-ph.GAgr-qc

星系的引力记忆

The Gravitational Memory of a Galaxy

Tom Banks, Willy Fischler

备注：: 8 pages, no figures, corrected typos

摘要：

我们认为，软引力辐射导致错误的角动量的恒星在遥远的星系中看到，这可以被解释为一个额外的质量内的恒星轨道。人们很容易把这一点与牛顿动力学的修正联系在一起，后者声称[1]消除了暗物质的必要性。简单估计的效果表明，它是非常小的，并没有正确的函数形式来解释塔利-费舍尔关系。这种效应确实会随着宇宙年龄的增长而增长，但如果我们的宇宙确实是由一个宇宙学常数主导的，那么在这种效应被观测到之前，大多数星系都会消失在宇宙学视界之外。我们推测，这种效应可以被认为是一种新的引力记忆：相对于银河系附近的帧，无穷远处的帧旋转。我们的工作的结论之一是，在很大的时候，线性化的经典处理这个问题是不够的，应该取代温伯格的软光子重建。然而，这些时间是如此之长，以至于它们似乎与我们生活的宇宙无关。这两种计算方法都不会对星系演化产生重大影响。

英文摘要：

We argue that soft gravitational radiation leads to a misidentification of the angular momentum of stars seen in distant galaxies, and that this could be interpreted as an additional mass inside the orbit of the star. It is tempting to identify this with the modifications of Newtonian dynamics that have been claimed [1] to eliminate the necessity for dark matter. Simple estimates of the effect show that it is very small and does not have the right functional form to explain the Tully-Fisher relation. The effect does grow with the age of the universe, but if our universe is indeed dominated by a cosmological constant, then most galaxies will disappear beyond the cosmological horizon before the effect is observable. We conjecture that this effect can be thought of as a new kind of gravitational memory: a rotation of frames at infinity, relative to those near the galaxy. One of the conclusions of our work is that at very large times the linearized classical treatment of this problem is inadequate, and should be replaced by Weinberg's soft photon resummation. However, these times are so long that they do not appear relevant to the universe in which we live. Neither method of calculation leads to a significant effect on galaxy evolution.

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