当前位置: X-MOL 学术J. Cosmol. Astropart. Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Tests of Dark MACHOs: lensing, accretion, and glow
Journal of Cosmology and Astroparticle Physics ( IF 5.3 ) Pub Date : 2020-09-22 , DOI: 10.1088/1475-7516/2020/09/044
Yang Bai 1 , Andrew J. Long 2 , Sida Lu 3
Affiliation  

Dark matter could take the form of dark massive compact halo objects (dMACHOs); i.e., composite objects that are made up of dark-sector elementary particles, that could have a macroscopic mass from the Planck scale to above the solar mass scale, and that also admit a wide range of energy densities and sizes. Concentrating on the gravitational interaction of dMACHOs with visible matter, we map out the mass-radius parameter space that is consistent with gravitational lensing experiments, as well as anisotropies of the cosmic microwave background (CMB) based on the spherical accretion of matter onto a dMACHO in the hydrostatic approximation. For dMACHOs with a uniform-density mass profile and total mass in the range of $\sim 10^{-12} - 10\,M_\odot$, we find that a dMACHO could explain 100% of the dark matter if its radius is above $\approx 3$ times the Einstein radius of the lensing system. For a larger mass above $10\,M_\odot$, a dMACHO with radius above $\sim 1 \times 10^8 \mbox{cm} \times(M/100\,M_\odot)^{9/2}$ is consistent with CMB observables. For a lighter dMACHO with mass below $\sim 10^{-12}\,M_\odot$, there still is not a good experimental probe. Finally, we point out that heavier dMACHOs with masses $\sim 0.1\,M_\odot$ may be observed by X-ray and optical telescopes if they reside at rest in a large molecular cloud, nearby to our solar system, and accrete ordinary matter to emit photons.

中文翻译:

Dark MACHO 的测试:透镜、吸积和发光

暗物质可以表现为暗质量致密光晕天体(dMACHOs);即,由暗区基本粒子组成的复合物体,其宏观质量可以从普朗克尺度到太阳质量尺度以上,并且还具有广泛的能量密度和尺寸范围。专注于 dMACHO 与可见物质的引力相互作用,我们绘制出与引力透镜实验一致的质量半径参数空间,以及基于物质在 dMACHO 上的球形吸积的宇宙微波背景 (CMB) 的各向异性在流体静力近似中。对于具有均匀密度质量分布和总质量在 $\sim 10^{-12} - 10\,M_\odot$ 范围内的 dMACHO,我们发现,如果 dMACHO 的半径大于透镜系统爱因斯坦半径的 3 倍,则 dMACHO 可以解释 100% 的暗物质。对于大于 $10\,M_\odot$ 的更大质量,半径大于 $\sim 1 \times 10^8 \mbox{cm} \times(M/100\,M_\odot)^{9/2} 的 dMACHO $ 与 CMB observables 一致。对于质量低于 $\sim 10^{-12}\,M_\odot$ 的较轻的 dMACHO,仍然没有很好的实验探针。最后,我们指出质量为 $\sim 0.1\,M_\odot$ 的较重 dMACHO,如果它们静止地驻留在大分子云中,靠近我们的太阳系,并吸积普通发射光子的物质。M_\odot)^{9/2}$ 与CMB observables 一致。对于质量低于 $\sim 10^{-12}\,M_\odot$ 的较轻的 dMACHO,仍然没有很好的实验探针。最后,我们指出质量为 $\sim 0.1\,M_\odot$ 的较重 dMACHO,如果它们静止地驻留在大分子云中,靠近我们的太阳系,并吸积普通发射光子的物质。M_\odot)^{9/2}$ 与CMB observables 一致。对于质量低于 $\sim 10^{-12}\,M_\odot$ 的较轻的 dMACHO,仍然没有很好的实验探针。最后,我们指出质量为 $\sim 0.1\,M_\odot$ 的较重 dMACHO,如果它们静止地驻留在大分子云中,靠近我们的太阳系,并吸积普通发射光子的物质。
更新日期:2020-09-22
down
wechat
bug