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arXiv 1005.0617hep-phastro-ph.CO
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暗物质、重子不对称性和自发B、L破缺

Dark Matter, Baryon Asymmetry, and Spontaneous B and L Breaking

Timothy R. Dulaney, Pavel Fileviez Perez, Mark B. Wise

摘要:

我们在一个简单的理论中研究了暗物质和宇宙学重子不对称性,其中重子(B)和轻子(L)数是自发破缺的局域规范对称性。在这个模型中,冷暗物质候选者是重子数最轻的新场,它的稳定性是规范对称性的自动结果。暗物质湮灭要么通过质量必须低于TeV的疏轻子规范玻色子,要么通过希格斯玻色子。由于疏轻子规范玻色子的质量必须低于TeV标度,我们发现在第一种情况下,弹性截面的下限约为5 × 10 ^{-46} cm ^2。即使重子数是可测量的,并且在弱标度之前不会自发破缺,但宇宙学上可接受的重子过剩是可能的。在获得测量的重子过剩和暗物质密度之间存在着张力。

英文摘要:

We investigate the dark matter and the cosmological baryon asymmetry in a simple theory where baryon (B) and lepton (L) number are local gauge symmetries that are spontaneously broken. In this model, the cold dark matter candidate is the lightest new field with baryon number and its stability is an automatic consequence of the gauge symmetry. Dark matter annihilation is either through a leptophobic gauge boson whose mass must be below a TeV or through the Higgs boson. Since the mass of the leptophobic gauge boson has to be below the TeV scale one finds that in the first scenario there is a lower bound on the elastic cross section of about 5x10^{-46} cm^2. Even though baryon number is gauged and not spontaneously broken until the weak scale, a cosmologically acceptable baryon excess is possible. There is tension between achieving both the measured baryon excess and the dark matter density.

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。

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