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arXiv 1407.0797hep-ph
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作为暗物质候选者的ELKO费米子

ELKO fermions as dark matter candidates

Bakul Agarwal, Pankaj Jain, Subhadip Mitra, Alekha C. Nayak, Ravindra K. Verma

摘要:

我们研究了ELKO费米子作为冷暗物质候选者的意义。这样的费米子出现在理论中,在完整的洛伦兹群下是不对称的。虽然它们不携带电荷,但ELKO仍然可以通过非标准相互作用与光子耦合。它们也与希格斯粒子耦合,但不与其他标准模型粒子耦合。假设这些粒子对宇宙学冷暗物质的贡献占主导地位,我们对它们的耦合强度和ELKO质量施加限制。我们还确定了直接暗物质搜索实验对ELKO光子和ELKO-Higgs耦合的限制。此外,我们还确定了伽马射线暴时间延迟观测对ELKO-Higgs耦合的限制。我们发现,天体物理学和宇宙学的考虑排除了ELKO可能有助于显着冷暗物质候选人的可能性。唯一允许它作为暗物质候选者做出重大贡献的情况是,它从未与宇宙等离子体平衡。我们还获得了ELKO自耦合和它的质量之间的关系,要求它是一致的,在银河系中心的致密核心的观测。

英文摘要:

We study the implications of the ELKO fermions as a cold dark matter candidate. Such fermions arise in theories that are not symmetric under the full Lorentz group. Although they do not carry electric charge, ELKOs can still couple to photons through a nonstandard interaction. They also couple to the Higgs but do not couple to other standard model particles. We impose limits on their coupling strength and the ELKO mass assuming that these particles give dominant contribution to the cosmological cold dark matter. We also determine limits imposed by the direct dark matter search experiments on the ELKO-photon and the ELKO-Higgs coupling. Furthermore we determine the limit imposed by the gamma ray bursts time delay observations on the ELKO-Higgs coupling. We find that astrophysical and cosmological considerations rule out the possibility that ELKO may contribute significantly as a cold dark matter candidate. The only allowed scenario in which it can contribute significantly as a dark matter candidate is that it was never in equilibrium with the cosmic plasma. We also obtain a relationship between the ELKO self-coupling and its mass by demanding it to be consistent with observations of dense cores in the galactic centers.

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