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1. chinaXiv:202101.00003 [pdf]

On dark matter

Xian-Qiao Yu
Subjects: Physics >> The Physics of Elementary Particles and Fields

In this article, I shall propose a new model of dark matter, in which I introduce a neutral primordial axial-vector field, which is a new field beyond the standard model. All the standard model elementary particles are produced spontaneously from this field in the Big Bang epoch of the universe and then these produced elementary particles decayed or annihilated in the well-known standard model interactions. The relic of the primordial axial-vector field appears in a form of vacuum energy can not only give naturally the correct abundance of dark matter in the present universe, but provide a natural solution to the cosmological constant problem as well. Some possible experiments for testing the new theory of dark matter are also suggested in this article.

submitted time 2021-03-29 Hits1760Downloads372 Comment 0

2. chinaXiv:202103.00136 [pdf]


郭碧峰; 彭青玉; 尚一佳 ; 覃永贵; 林孚荣
Subjects: Astronomy >> Astrophysical processes

天体随时间的光度变化能够反映其物理性质,高精度测光技术的研究帮助我们更好地分析与探究天体的光变情况,对天体的演化研究有重要意义。本文介绍了相关的测光工具与技术,探索了把MaxIm DL软件与photutils测光库相结合的测光技术及其应用,提出了连续图像中各星像测光数据快速匹配的解决方案。通过分析中国科学院云南天文台1m光学望远镜拍摄的M35星团图像,本文发现了相对测光中存在精度回报(precision premium)现象,即相近的两颗星进行相对测光具有更高的测量精度,且该现象的显著程度与大气质量相关。针对于相对测光的精度回报现象,本文提出了高精度相对测光的参考方法。

submitted time 2021-03-29 From cooperative journals:《天文研究与技术》 Hits212Downloads146 Comment 0

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