论文标题

大量中微子对相关函数线性点的影响

The effects of massive neutrinos on the linear point of the correlation function

论文作者

Parimbelli, G., Anselmi, S., Viel, M., Carbone, C., Villaescusa-Navarro, F., Corasaniti, P. S., Rasera, Y., Sheth, R., Starkman, G. D., Zehavi, I.

论文摘要

线性点(LP)定义为两点聚类相关函数(TPCF)之间的浸入和峰之间的中点,已被证明是宇宙学的出色标准统治者。实际上,它几乎独立于红移,对非线性,依赖比例的光环偏置和红移空间变形弱敏感。到目前为止,假设中微子是无质量的,对这些发现进行了测试。在本文中,我们将分析扩展到大规模的中性宇宙学。特别是,我们检查了中微子诱导的规模依赖性生长是否会影响LP位置,以及与无质量中性的情况相比,使用LP的移位可以检测中微子质量。出于我们的目的,我们采用了两套带有大量中微子的最先进的$ n $ body模拟。对于每个人,我们测量了冷暗物质(CDM)和光晕的TPCF,并且为了估计LP,请在Baryon声学振荡(BAO)的尺度范围内与模型无关的参数拟合拟合TPCF。总体而言,我们发现LP即使中微子很大,LP仍保留其作为标准尺子的特征。因此,可以使用LP测量的宇宙距离来限制中微子质量。

The linear point (LP), defined as the mid-point between the dip and the peak of the two-point clustering correlation function (TPCF), has been shown to be an excellent standard ruler for cosmology. In fact, it is nearly redshift-independent, being weakly sensitive to non-linearities, scale-dependent halo bias and redshift-space distortions. So far, these findings were tested assuming that neutrinos are massless; in this paper we extend the analysis to massive-neutrino cosmologies. In particular, we examine if the scale-dependent growth induced by neutrinos affects the LP position and if it is possible to detect the neutrino masses using the shift of the LP compared to the massless-neutrino case. For our purposes, we employ two sets of state-of-the-art $N$-body simulations with massive neutrinos. For each of them we measure the TPCF of cold dark matter (CDM) and halos and, to estimate the LP, fit the TPCF with a model-independent parametric fit in the range of scales of the Baryon Acoustic Oscillations (BAO). Overall, we find that the LP retains its features as a standard ruler even when neutrinos are massive. The cosmic distances measured with the LP can therefore be employed to constrain the neutrino mass.

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