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arXiv 0803.2274hep-phastro-phgr-qc
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中微子相互作用暗能量模型中宇宙学探针测量的中微子质量

Neutrino Masses from Cosmological Probes in Interacting Neutrino Dark-Energy Models

Kiyotomo Ichiki, Yong-Yeon Keum

摘要:

我们研究了大质量中微子与经典标量场的相互作用是否是宇宙晚期加速膨胀的起源。给出了宇宙学线性微扰理论在暗能量模型中微子探测器中的显式表达式,计算了宇宙微波背景各向异性和物质功率谱。在这些模型中,中微子质量的演化是由精粹标量场决定的,这是一个变化的有效状态方程的原因:$ω_{eff}(z)$下降到-1。我们考虑了几种类型的标量场势,并对中微子与暗能量之间的耦合参量进行了限制。结合WMAP三年观测结果、大尺度结构和2dFGRS观测数据等宇宙微波背景(CMB)实验数据,在变质量中微子假设下对大质量中微子假说进行了约束.假设宇宙是平坦的,我们可以从目前的观测中得到的约束条件是,对于三种中微子的总和,在1 $σ$的置信水平下为$\sum m_ν < 0.45$ eV(在2 $σ$的置信水平下为0.87 eV)。讨论了标量场的动力学性质以及标量场扰动对宇宙微波背景各向异性的影响。我们还讨论了模型的不稳定性问题,证实了中微子对密度涨落是稳定的。

英文摘要:

We investigate whether interaction between massive neutrinos and quintessence scalar field is the origin of the late time accelerated expansion of the universe. We present explicit formulas of the cosmological linear perturbation theory in the neutrinos probes of dark-energy model, and calculate cosmic microwave background anisotropies and matter power spectra. In these models, the evolution of the mass of neutrinos is determined by the quintessence scalar field, which is responsible for a varying effective equation of states: $ω_{eff}(z)$ goes down -1. We consider several types of scalar field potential and put constraints on the coupling parameter between neutrinos and dark energy. By combining data from cosmic microwave background (CMB) experiments including the WMAP 3-year results, large scale structure with 2dFGRS data sets, we constrain the hypothesis of massive neutrinos in the mass-varying neutrino scenario. Assuming the flatness of the universe, the constraint we can derive from the current observation is $\sum m_ν < 0.45$ eV at 1$σ$ (0.87 eV at 2$σ$) confidence level for the sum over three species of neutrinos. The dynamics of scalar field and the impact of scalar field perturbations on cosmic microwave background anisotropies are discussed. We also discuss on the instability issue of the our model and confirm that neutrinos are stable against the density fluctuation.

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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