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arXiv 1403.6473hep-phastro-ph.COhep-th
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各向异性LARGE体紧致化中的暗辐射

Dark Radiation in Anisotropic LARGE Volume Compactifications

Stephen Angus

摘要:

暗辐射是$Λ$ CDM的一个引人注目的扩展:当前的实验结果暗示了$ΔN_{\rm eff} \gtrsim 0.5$,如果包括最近的BICEP 2结果,则增加到$ΔN_{\rm eff} \simeq 1$。近年来,暗辐射被放在弦论模型的背景下考虑,如IIB型弦论的大体积方案,在当今的宇宙学观测和普朗克尺度的物理模型之间建立了联系。在本文中,我认为一个扩展的大容量的情况下,散装量是稳定的两个模量,而不是一个。因此,最轻模量不再对应于压实体积,而是对应于体几何形状中的横向方向。我专注于方案中,通过本地化的标准模型D3膜在一个奇点的软质量的隔离。在这样的模型中产生的暗辐射的比例大大超过了实验范围,排除了具有两个体积模量的隔离大体积场景作为早期宇宙模型的可能性。

英文摘要:

Dark radiation is a compelling extension to $Λ$CDM: current experimental results hint at $ΔN_{\rm eff} \gtrsim 0.5$, which is increased to $ΔN_{\rm eff} \simeq 1$ if the recent BICEP2 results are included. In recent years dark radiation has been considered in the context of string theory models such as the LARGE Volume Scenario of type IIB string theory, forging a link between present-day cosmological observations and models of physics at the Planck scale. In this paper I consider an extension of the LARGE Volume Scenario in which the bulk volume is stabilised by two moduli instead of one. Consequently, the lightest modulus no longer corresponds to the compactification volume but instead to a transverse direction in the bulk geometry. I focus on scenarios in which sequestering of soft masses is achieved by localising the Standard Model on D3 branes at a singularity. The fraction of dark radiation produced in such models vastly exceeds experimental bounds, ruling out the sequestered LARGE Volume Scenario with two bulk moduli as a model of the early Universe.

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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