Neutrino Masses from Cosmological Probes in Interacting Neutrino Dark-Energy Models
Neutrino Masses from Cosmological Probes in Interacting Neutrino Dark-Energy Models
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DOI：
10.1088/1126-6708/2008/06/058
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
K. Ichiki;Y. Keum
中科院分区：
文献类型：
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作者：
K. Ichiki;Y. Keum
我们研究了大质量中微子与精质标量场之间的相互作用是否是宇宙晚时间加速膨胀的起源。我们给出了宇宙线性摄动理论在暗能量模型中微子探测器中的显式公式，并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，它负责变化的有效状态方程：$\omega_{eff}(z)$下降-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数进行了约束。通过结合宇宙微波背景（CMB）实验数据，包括WMAP 3年的结果、大尺度结构和2dFGRS数据集，我们在变质量中微子场景中约束了大质量中微子的假设。假设宇宙是平坦的，我们可以从目前的观测中得出的约束条件是在1 $\sigma$处的$\sum m_{\nu} < 0.45$ eV（在2 $\sigma$处的0.87 eV），这是三种中微子之和的置信水平。讨论了标量场的动力学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，并证实了中微子对密度涨落是稳定的。
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: $\omega_{eff}(z)$ 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 $\sum m_{\nu} < 0.45$ eV at 1$\sigma$ (0.87 eV at 2$\sigma$) 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.