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 2001.06577hep-ph
收藏

几何暗物质

Geometric Dark Matter

Durmus Demir, Beyhan Pulice

摘要:

暗物质,从平坦的旋转曲线到结构形成的各种现象都需要它,它似乎不仅是中性的和长寿的,而且与普通物质高度隔离。在这里,我们表明,度量仿射引力,其中涉及度量张量和仿射连接作为两个独立的领域,动态减少,在其最小的形式,通常的重力加上一个巨大的向量场。这个矢量只与夸克、轻子和引力相互作用,当它的质量范围是$9.4\ {\rm MeV} < M_Y < 28.4\ {\rm MeV}$时,它是中性的,寿命长(比宇宙的年龄长)。它从核子散射的截面比目前的边界低60个数量级,太小了,不便于直接探测暗物质。这一性质为暗物质的搜寻提供了一个解释。我们表明,由于其几何起源的$Y_μ$不耦合标量和规范玻色子。它只与费米子耦合。$Y_μ$的这一特征使它与文献中所有其他矢量暗物质候选者有着根本的不同。我们提出的几何暗物质是最小的和自洽的,不仅在理论上,而且在天体物理学上,它的弱相互作用的性质是它的长寿所需要的。

英文摘要:

The dark matter, needed for various phenomena ranging from flat rotation curves to structure formation, seems to be not only neutral and long-living but also highly secluded from the ordinary matter. Here we show that, metric-affine gravity, which involves metric tensor and affine connection as two independent fields, dynamically reduces, in its minimal form, to the usual gravity plus a massive vector field. The vector, which interacts with only the quarks, leptons and gravity, is neutral and long-living (longer than the age of the Universe) when its mass range is $9.4\ {\rm MeV} < M_Y < 28.4\ {\rm MeV}$. Its scattering cross section from nucleons, which is some 60 orders of magnitude below the current bounds, is too small to facilitate direct detection of the dark matter. This property provides an explanation for whys and hows of dark matter searches. We show that due to its geometrical origin the $Y_μ$ does not couple to scalars and gauge bosons. It couples only to fermions. This very feature of the $Y_μ$ makes it fundamentally different than all the other vector dark matter candidates in the literature. The geometrical dark matter we present is minimal and self-consistent not only theoretically but also astrophysically in that its feebly interacting nature is all that is needed for its longevity.

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。

↑