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arXiv 1303.4550astro-ph.CO
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类欧几里德星系团巡天对中微子性质的约束

Constraining neutrino properties with a Euclid-like galaxy cluster survey

M. Costanzi Alunno Cerbolini, B. Sartoris, Jun-Qing Xia, A. Biviano, S. Borgani, M. Viel

摘要:

我们进行了预测分析如何以及一个欧几里德测光星系团调查将限制中微子的总质量和有效数量的中微子物种。我们的分析基于蒙特卡罗马尔可夫链技术,结合信息,从集群数量计数和集群功率谱。我们发现,结合集群数据与CMB测量普朗克提高了一个数量级以上的约束中微子质量相比,每个探针独立使用。对于LCDM+m_nu模型,总中微子质量的2 σ上限从单独使用团簇数据时的M_nu < 0.35 eV移动到与CMB数据结合时的M_nu < 0.031 eV。当考虑一个非标准模型时,我们估计N_eff<3.14(95%CL),而中微子质量的界限放宽到M_nu < 0.040 eV.即使在最小正态层次的情况下,这种精度也足以对中微子质量进行2 σ检测。我们还考虑了恒定的暗能量状态方程和非零曲率的情况。当考虑这些模型时,M_nu的误差仅受到轻微影响,而相对于标准情况,N_eff的2 sigma误差棒分别受到约15%和约20%的较大影响。我们还处理了LCDM+m_nu+N_eff的情况下,自由滋扰参数,参数化的不确定性的集群质量的测定。在这种情况下,M_nu的上限被放宽了一个大于2的因子,M_nu < 0.083 eV(95%CL),因此降低了探测中微子总质量的可能性。因此,我们确认了一个大型的光学/近红外星系团调查的潜力,就像欧几里得所做的那样,可以限制中微子的性质。

英文摘要:

We perform a forecast analysis on how well a Euclid-like photometric galaxy cluster survey will constrain the total neutrino mass and effective number of neutrino species. We base our analysis on the Monte Carlo Markov Chains technique by combining information from cluster number counts and cluster power spectrum. We find that combining cluster data with CMB measurements from Planck improves by more than an order of magnitude the constraint on neutrino masses compared to each probe used independently. For the LCDM+m_nu model the 2 sigma upper limit on total neutrino mass shifts from M_nu < 0.35 eV using cluster data alone to M_nu < 0.031 eV when combined with CMB data. When a non-standard model with N_eff number of neutrino species is considered, we estimate N_eff<3.14 (95% CL), while the bounds on neutrino mass are relaxed to M_nu < 0.040 eV. This accuracy would be sufficient for a 2 sigma detection of neutrino mass even in the minimal normal hierarchy scenario. We also consider scenarios with a constant dark energy equation of state and a non-vanishing curvature. When these models are considered the error on M_nu is only slightly affected, while there is a larger impact of the order of ~ 15 % and ~ 20% respectively on the 2 sigma error bar of N_eff with respect to the standard case. We also treat the LCDM+m_nu+N_eff case with free nuisance parameters, which parameterize the uncertainties on the cluster mass determination. In this case, the upper bounds on M_nu are relaxed by a factor larger than two, M_nu < 0.083 eV (95% CL), hence compromising the possibility of detecting the total neutrino mass with good significance. We thus confirm the potential that a large optical/near-IR cluster survey, like that to be carried out by Euclid, could have in constraining neutrino properties [abridged].

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