arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1007.0970astro-ph.COgr-qchep-phhep-th
收藏

整体二次势对银河系自转曲线的影响

Impact of a global quadratic potential on galactic rotation curves

Philip D. Mannheim, James G. O'Brien

摘要:

我们对110个旋涡星系的样本进行了共形重力拟合,并在这里报告了其中20个星系的旋转曲线数据点从星系中心延伸得最远。我们确定的20个星系的数据集上的一个通用的德西特的潜在项$V(r)=-κc^2r^2/2$,这是由宇宙背景中的不均匀性引起的影响。这个二次项伴随着一个与宇宙背景本身有关的普适线性势项$V(r)=γ_0c^2r/2$。我们发现,当这两个潜在的条款是采取与本地发光物质的星系内产生的贡献,共形理论是能够占旋转曲线系统学,是在整个110星系样本中观察到的,而不需要任何暗物质。我们的研究发现,两个普适系数是全球性的,即$κ=9.54\times 10^{-54} {\rm cm}^{-2}$和$γ_0=3.06\times 10^{-30}{\rm cm}^{-1}$,我们的研究表明,调用的存在暗物质可能只不过是试图描述全球性的影响,在纯粹的本地星系条款。由于二次势项具有负号,星系只能支持$γ_0/κ= 3.21\times 10^{23} {\rm cm}$量级的束缚轨道,因此全球物理学对星系的大小施加了自然限制。

英文摘要:

We have made a conformal gravity fit to an available sample of 110 spiral galaxies, and report here on the 20 of those galaxies whose rotation curve data points extend the furthest from galactic centers. We identify the impact on the 20 galaxy data set of a universal de Sitter-like potential term $V(r)=-κc^2r^2/2$ that is induced by inhomogeneities in the cosmic background. This quadratic term accompanies a universal linear potential term $V(r)=γ_0c^2r/2$ that is associated with the cosmic background itself. We find that when these two potential terms are taken in conjunction with the contribution generated by the local luminous matter within the galaxies, the conformal theory is able to account for the rotation curve systematics that is observed in the entire 110 galaxy sample, without the need for any dark matter whatsoever. With the two universal coefficients being found to be of global magnitude, viz. $κ=9.54\times 10^{-54} {\rm cm}^{-2}$ and $γ_0=3.06\times 10^{-30}{\rm cm}^{-1}$, our study suggests that invoking the presence of dark matter may be nothing more than an attempt to describe global effects in purely local galactic terms. With the quadratic potential term having negative sign, galaxies are only able to support bound orbits up to distances of order $γ_0/κ= 3.21\times 10^{23} {\rm cm}$, with global physics thus imposing a natural limit on the size of galaxies.

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。

↑