arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.01882astro-ph.CO
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用场团质量函数的漂移系数约束中微子质量

Constraining the Neutrino Mass with the Drifting Coefficient of the Field Cluster Mass Function

Suho Ryu, Jounghun Lee

摘要:

提出了一种利用场团质量函数的漂移系数来诊断中微子总质量($M_ν$)与原初功率谱振幅($σ_{8}$)之间简并性的新方法。通过分析宇宙学大质量中微子模拟的数据,我们首先确定了场团在不同红移处的数值质量函数。然后,我们比较的数值计算结果与分析模型的特点是由一个单一的参数称为漂移系数,测量的漂移的崩溃密度阈值,$δ_{c}$,从爱因斯坦-德西特球的值,$δ_{sc}$,在给定的质量尺度。结果表明,场团质量函数的解析模型在有大质量中微子存在的情况下也能很好地工作,并且其漂移系数在不同$M_ν$值的宇宙学中有不同的演化.在低红移($z\lesssim 0.3$)时,质量越大的中微子使$δ_{c}$从$δ_{sc}$漂移得越远,而在高红移($z\gtrsim0.3$)时则发现相反的趋势。推测这种明显的红移依赖效应的大质量中微子的漂移系数的场簇质量函数可能有助于打破$σ_{8}$ - $M_ν$简并,我们还表明,这种新的诊断$M_ν$的灵敏度是足够高的区分的情况下,$M_ν=0.1\,{\rm eV}$的无质量中微子。

英文摘要:

A new diagnostics to break the degeneracy between the total neutrino mass ($M_ν$) and the primordial power spectrum amplitude ($σ_{8}$) by using the drifting coefficient of the field cluster mass function is presented. Analyzing the data from the Cosmological Massive Neutrino Simulations, we first determine the numerical mass functions of the field clusters at various redshifts. Then, we compare the numerical results with the analytical model characterized by a single parameter called the drifting coefficient which measures the drifts of the collapse density threshold, $δ_{c}$, from the Einstein-de Sitter spherical value, $δ_{sc}$, at a given mass scale. It is found that the analytic model for the field cluster mass function is found to work excellently even in the presence of massive neutrinos and that its drifting coefficient evolves differently in the cosmologies with different values of $M_ν$. At low redshifts ($z\lesssim 0.3$) the more massive neutrinos drift $δ_{c}$ further from $δ_{sc}$, while the opposite trend is found at higher redshifts ($z\gtrsim0.3$). Speculating that this distinct redshift-dependent effect of massive neutrinos on the drifting coefficient of the field cluster mass function might help break the $σ_{8}$-$M_ν$ degeneracy, we also show that the sensitivity of this new diagnostics to $M_ν$ is high enough to discriminate the case of $M_ν=0.1\,{\rm eV}$ from that of massless neutrinos.

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