arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.2614hep-phastro-ph.CO
收藏

次优势惰性双态暗物质改进的电弱相变

Improved Electroweak Phase Transition with Subdominant Inert Doublet Dark Matter

James M. Cline, Kimmo Kainulainen

摘要:

惰性双态暗物质模型作为促进重子生成所需的强一阶电弱相变(EWPT)的一种可能手段,最近引起了人们的注意。我们通过考虑DM比希格斯质量的一半重的制度来扩展以前的结果,并且其遗迹密度由湮灭成W,Z和希格斯玻色子玻色子来确定。我们发现一个大的自然区域的参数空间的EWPT是强烈的一阶,而最轻的惰性的双重态通常只占总暗物质的0.1-3%。尽管密度很小,但它与核子的相互作用足够强,可以直接检测到,比XENON 100目前的灵敏度提高了5倍。预测希格斯衰变到两个光子的分支比降低10%。

英文摘要:

The inert doublet dark matter model has recently gained attention as a possible means of facilitating a strongly first order electroweak phase transition (EWPT), as needed for baryogenesis. We extend previous results by considering the regime where the DM is heavier than half the Higgs mass, and its relic density is determined by annihilation into W, Z and Higgs bosons. We find a large natural region of parameter space where the EWPT is strongly first order, while the lightest inert doublet state typically contributes only 0.1-3% of the total dark matter. Despite this small density, its interactions with nucleons are strong enough to be directly detectable given a factor of 5 improvement over the current sensitivity of XENON100. A 10% decrease in the branching ratio for Higgs decays to two photons is predicted.

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。

↑