arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1209.3532astro-ph.CO
收藏

Grumiller修正引力中的Galerkin转动曲线

Galaxies Rotation Curves in the Grumiller's Modified Gravity

Hai-Nan Lin, Ming-Hua Li, Xin Li, Zhe Chang

摘要:

Grumiller修正引力中的有效势[D. Grumiller,Phys. Rev. Lett { \bf 105},211303(2010)]包括牛顿势和Rindler项。对8个星系自转曲线数据的拟合表明存在一个普遍的Rindler加速度$a\approx 0.30\times 10^{-10}$ m s $^{-2}$。我们首先进行双参数拟合,其中质光比($Υ_*$)和Rindler加速度($a$)作为自由参数。结果表明,在$0\lesssim r \lesssim 40$ kpc范围内,八个星系中有六个星系的数据与理论预测符合得很好,但理论曲线在此范围外有上升的趋势。六个拟合良好的星系的林德勒加速度具有相同的大小,平均值为$\bar{a}\approx0.30\times 10^{-10}$ m s $^{-2}$。受此启发,我们对六个星系进行了单参数($Υ_*$)拟合,将$a$固定在$\bar{a}$,发现理论仍然可以再现观测结果。我们在这里得到的林德勒加速度的值是米尔格罗姆MOND的四分之一。对于另外两个星系NGC 5055和DDO 154,如果加入光度标度长度($h$)作为自由参数,则拟合结果得到明显改善。

英文摘要:

The effective potential in the Grumiller's modified gravity [D. Grumiller, Phys. Rev. Lett {\bf 105}, 211303 (2010)] includes the Newtonian potential and a Rindler term. The fitting to the rotation curve data of eight galaxies suggests a universal Rindler acceleration $a\approx 0.30\times 10^{-10}$ m s$^{-2}$. We do a two-parameter fit first, with the mass-to-light ratio ($Υ_*$) and the Rindler acceleration ($a$) as free parameters. It is found that the data of six out of the eight galaxies fit well with the prediction of theory in the range $0\lesssim r \lesssim 40$ kpc, although the theoretical curves show a tendency of arising beyond this range. The Rindler accelerations of the six well-fitted galaxies have the same magnitude, with an average value $\bar{a}\approx0.30\times 10^{-10}$ m s$^{-2}$. Inspired by this fact, we then carry out a one-parameter ($Υ_*$) fit to the six galaxies, with $a$ fixed at $\bar{a}$, and find that the theory can still reproduce the observation. The value of Rindler acceleration we get here is a quarter of that of Milgrom's MOND. For the rest two galaxies, NGC5055 and DDO154, the fitting results are significantly improved if the photometric scale length ($h$) is included as another free parameter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑