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 2409.16655gr-qcastro-ph.GA
收藏

用涌现引力理解矮星系的径向加速度关系

Understanding the Radial Acceleration Relation of Dwarf Galaxies with Emergent Gravity

Sanghyeon Han, Ho Seong Hwang, Youngsub Yoon

AI总结:

本文将 Verlinde 的涌现引力理论扩展至本星系群30个矮星系,发现其预测的径向加速度与观测一致,无需暗物质即可解释低质量星系运动学,优于需引入新插值函数的 MOND。

摘要:

我们研究矮星系的径向加速度关系(RAR)能否由 Verlinde 的涌现引力来解释。这是将 arXiv:2206.11685v3(研究典型旋涡星系的 RAR)向更低质量系统的扩展。为此,我们从文献中汇编了本星系群内 30 个矮星系的视线速度弥散分布。随后,我们在涌现引力框架下计算了由恒星成分产生的预期引力加速度,并将其与观测结果进行比较。在准德西特宇宙假设下,基于涌现引力计算的加速度在不确定性范围内与观测值一致。我们的结果表明,即使在不引入暗物质的情况下,涌现引力也能解释星系运动学,甚至对于预期暗物质占主导地位的低质量星系也是如此。这与 MOND 形成鲜明对比,后者必须为矮星系引入新的插值函数,才能在不引入暗物质的情况下解释其运动学。

英文摘要:

We examine whether the radial acceleration relation (RAR) of dwarf galaxies can be explained by Verlinde's emergent gravity. This is the extension of arXiv:2206.11685v3, which examines the RAR of typical spiral galaxies, to less massive systems. To do this, we compile the line-of-sight velocity dispersion profiles of 30 dwarf galaxies in the Local Group from the literature. We then calculate the expected gravitational acceleration from the stellar component in the framework of the emergent gravity, and compare it with that from observations. The calculated acceleration with the emergent gravity under the assumption of a quasi-de Sitter universe agrees with the observed one within the uncertainty. Our results suggest that the emergent gravity can explain the kinematics of galaxies without introducing dark matter, even for less massive galaxies where dark matter is expected to dominate. This sharply contrasts with MOND, where a new interpolating function has to be introduced for dwarf galaxies to explain their kinematics without dark matter.

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。

↑