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arXiv 1208.3563hep-phastro-ph.COhep-th
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Large体积紧致化中的暗辐射和暗物质

Dark Radiation and Dark Matter in Large Volume Compactifications

Tetsutaro Higaki, Fuminobu Takahashi

摘要:

我们认为,暗辐射是自然产生的衰减的整体体积模量在大体积的情况下。我们认为隔离和非隔离的情况下,并发现,轴超伙伴的模量产生的模量衰减,它可以解释暗辐射的观察建议,而通过Giudice-Masiero项模量衰减的总衰减率的主要贡献。在隔离的情况下,由模量衰减产生的最轻的超对称粒子自然可以解释观测到的暗物质密度。另一方面,在非隔离的情况下,超对称粒子不是由模衰变产生的,因为软质量是重引力子质量的量级。QCD轴子将是一个可信的暗物质候选者。

英文摘要:

We argue that dark radiation is naturally generated from the decay of the overall volume modulus in the LARGE volume scenario. We consider both sequestered and non-sequestered cases, and find that the axionic superpartner of the modulus is produced by the modulus decay and it can account for the dark radiation suggested by observations, while the modulus decay through the Giudice-Masiero term gives the dominant contribution to the total decay rate. In the sequestered case, the lightest supersymmetric particles produced by the modulus decay can naturally account for the observed dark matter density. In the non-sequestered case, on the other hand, the supersymmetric particles are not produced by the modulus decay, since the soft masses are of order the heavy gravitino mass. The QCD axion will then be a plausible dark matter candidate.

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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