arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.2222hep-phastro-ph.GA
收藏

银河系中心的兴奋暗物质

Exciting dark matter in the galactic center

Fang Chen, James M. Cline, Anthony Fradette, Andrew R. Frey, Charles Rabideau

摘要:

我们重新考虑的建议,激发暗物质(DM)的解释为多余的511千电子伏的伽马射线的正电子在银河系中心。我们定量计算了DM湮灭到附近激发态的截面,通过交换一个新的非对角耦合的轻规范玻色子到DM态。在两个激发态都必须足够重才能衰变到e^+ e^-和基态的模型中,正电子产生的预测速率永远不会大到与观测相符,除非人们对银河系中的局部圆周速度做出极端假设,或者如果存在一个亚稳态的DM态群,它可以通过小于650 keV的质量间隙被激发,然后衰变成电子和正电子

英文摘要:

We reconsider the proposal of excited dark matter (DM) as an explanation for excess 511 keV gamma rays from positrons in the galactic center. We quantitatively compute the cross section for DM annihilation to nearby excited states, mediated by exchange of a new light gauge boson with off-diagonal couplings to the DM states. In models where both excited states must be heavy enough to decay into e^+ e^- and the ground state, the predicted rate of positron production is never large enough to agree with observations, unless one makes extreme assumptions about the local circular velocity in the Milky Way, or alternatively if there exists a metastable population of DM states which can be excited through a mass gap of less than 650 keV, before decaying into electrons and positrons.

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。

↑