arXiv 1404.39092014-04-15astro-ph.COastro-ph.GAhep-phhep-th

第一代恒星上的粒子暗物质足迹

A particle dark matter footprint on the first generation of stars

Ilidio Lopes, Joseph Silk

备注：: 8 pages; 5 figures ; The article's link: http://iopscience.iop.org/0004-637X/786/1/25/
发表信息：: The Astrophysical Journal, Volume 786, 25 (2014)
DOI：: 10.1088/0004-637X/786/1/25

摘要：

暗物质粒子，其性质与暗物质候选者相同，几个致力于实验探测暗物质的国际合作暗示了这一点（DAMA，COGENT，CRESST和CDMS-II，尽管不是，最值得注意的是，LUX），并且也具有与观察到的重子不对称性相同的暗物质不对称性（普朗克和威尔金森微波各向异性探测器），可能会对第一代低金属量恒星的演化产生重大影响。这些恒星在恒星演化的不同阶段，即主序星前阶段、主序星阶段和红巨星阶段的寿命都有显著的延长。特别是，红巨星阶段的中等质量恒星在光度和化学成分方面会发生显着变化。暗物质粒子的湮灭会影响恒星的内部，使得$3α-$反应在产生碳和氧时变得不那么有效。这种暗物质效应与今天在低质量和低金属含量的恒星中观察到的碳和其他金属过量相矛盾。因此，我们可以给暗物质晕密度加上一个上限，从而也给红移加上一个上限，在这个上限上，第一代低金属量恒星形成。

英文摘要：

Dark matter particles with properties identical to dark matter candidates that are hinted at by several international collaborations dedicated to experimental detection of dark matter (DAMA, COGENT, CRESST and CDMS-II, although not, most notably, by LUX), and which also have a dark matter asymmetry identical to the observed baryon asymmetry (Planck and Wilkinson Microwave Anisotropy Probe), may produce a significant impact on the evolution of the first generation of low-metallicity stars. The lifetimes of these stars in different phases of stellar evolution are significantly extended, namely, in the pre-main sequence, main sequence, and red giant phases. In particular, intermediate-mass stars in the red giant phase experience significant changes in their luminosity and chemical composition. The annihilations of dark matter particles affect the interior of the star in such a way that the $3α-$reaction becomes less efficient in the production of carbon and oxygen. This dark matter effect contradicts the excess of carbon and other metals observed today in stars of low mass and low metallicity. Hence, we can impose an upper limit on the dark matter halo density, and therefore on the redshift, at which the first generation of low-metallicity stars formed.

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。

摘要：

英文摘要：

相关论文