arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.2143hep-phastro-ph.CO
收藏

再加热温度高的超对称轴子模型中的暗辐射和暗物质

Dark radiation and dark matter in supersymmetric axion models with high reheating temperature

Peter Graf, Frank Daniel Steffen

摘要:

最近对宇宙微波背景、大尺度结构和大爆炸核合成(BBN)的研究显示出额外辐射的趋势。在超对称强子轴子模型的框架内,我们探讨了两个高再加热温度的情况下,可以解释一致的额外辐射和冷暗物质(CDM),后者驻留在引力子或轴子。在引力子CDM的情况下,来自热介子衰变的轴子在BBN之前已经提供了额外的辐射,而具有宇宙学所需的TeV尺度质量的轴子衰变可以产生额外的熵。在轴子CDM的情况下,宇宙学的约束是尊重轻eV尺度axino和弱尺度引力子衰变成轴子和axino。这些衰变导致后期额外的辐射,可以与早期的贡献共存。最近普朗克卫星探测到的结果是在晚些时候的额外辐射,因此这两种情况都有。进一步的测试是在ADMX上寻找轴子,在LHC上寻找超对称粒子。

英文摘要:

Recent studies of the cosmic microwave background, large scale structure, and big bang nucleosynthesis (BBN) show trends towards extra radiation. Within the framework of supersymmetric hadronic axion models, we explore two high-reheating-temperature scenarios that can explain consistently extra radiation and cold dark matter (CDM), with the latter residing either in gravitinos or in axions. In the gravitino CDM case, axions from decays of thermal saxions provide extra radiation already prior to BBN and decays of axinos with a cosmologically required TeV-scale mass can produce extra entropy. In the axion CDM case, cosmological constraints are respected with light eV-scale axinos and weak-scale gravitinos that decay into axions and axinos. These decays lead to late extra radiation which can coexist with the early contributions from saxion decays. Recent results of the Planck satellite probe extra radiation at late times and thereby both scenarios. Further tests are the searches for axions at ADMX and for supersymmetric particles at the LHC.

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。

↑