论文标题
使用弱透镜与中性氢的重电后探针的跨相关性来限制暗能量
Constraining dark energy using the cross correlations of weak lensing with post-reionization probes of neutral hydrogen
论文作者
论文摘要
我们研究了检测CMBR弱透镜收敛场与重新电位后的暗物质分布的大规模示踪剂的跨相关性的前景。然后，使用互相关来对具有不断发展的黑能的模型的状态暗能方程（EOS）进行误差预测。我们研究了弱透明场与Lyman-$α$ Forest的互相关角功率谱和来自电离后时期的红移HI 21 cm信号。角功率光谱表示为在断层片切片上的视线平均线。我们发现，使用多个$ 400 $ hrs观察与扩展的UGMRT（例如乐器），或与老板（QSO）的调查（QSO）密度为$ 16 {\ rm deg}^{ - 2} $，可以在很高的SNR（$> 20 $> 20 $> 20 $）上检测到一半的天空的交叉相关性，而较弱的伴奏融合了一半。弱透镜与Lyman-$α$ Forest的互相关允许在暗能量EOS参数上$ 1-σ$错误，以限制与合并的Planck+SNIA+SNIA+BAO+HST投影相当的精确度。发现21厘米的弱透镜互相关可为7CPL模型以$ 4 \％$（$ 4 \％$）的目前值提供强大的约束。对于7CPL模型以外的型号，$ W_A $上的约束是可比性的（$ \ sim 12 \％$）。我们还发现，CPL参数化可能不是深色能量演化的最佳约束参数化。因此，CMBR弱透镜与中性氢的重新电源探针的互相关具有使我们对不断发展的暗能量的性质有价值的理解的潜力。
We investigate the prospects of detecting the cross correlation of CMBR weak-lensing convergence field with the large scale tracers of the underlying dark matter distribution in the post-reionization epoch. The cross-correlation is then used to make error projections for dark energy equation of state (EoS)for models with a time evolving dark energy. We study the cross-correlation angular power spectrum of the weak-lensing field with the Lyman-$α$ forest and the redshifted HI 21 cm signal from the post reionization epoch. The angular power spectra is expressed as a line of sight average over the tomographic slices. We find that on using multiple $400$ hrs observation with an extended uGMRT like instrument or with a BOSS like survey with quasar (QSO) density of $16 {\rm deg}^{-2}$ the cross-correlation with weak-lensing convergence field covering half the sky can be detected at a very high SNR ($>20$). The cross-correlation of weak-lensing with Lyman-$α$ forest allows the $1-σ$ errors on the dark energy EoS parameters for different parametrizations to be constrained at a level of precision comparable to combined Planck+SNIa+BAO+HST projections. The 21-cm weak-lensing cross-correlation is found to provide strong constraints on the present value of the dark energy EoS parameter at $4\%$ for the 7CPL model. The constraints on $w_a$ is comparable ($\sim 12\%$) for models other than the 7CPL model. We also find that the CPL parametrization may not be the best constrained parametrization for dark energy evolution. The cross-correlation of CMBR weak-lensing with the post-reionization probes of neutral hydrogen thus holds the potential to give us valuable understanding about the nature of evolving dark energy.
