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arXiv 1102.3877astro-ph.CO
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非线性弱透镜预测

Non-linear weak lensing forecasts

Luciano Casarini, Giuseppe La Vacca, Luca Amendola, Silvio A. Bonometto, Andrea V. Macciò

摘要:

我们研究了非线性修正对弱透镜探针中暗能量参数估计的影响。我们发现,使用halofit表达式,适合LCDM模型,意味着实质性的差异,直接从N体模拟得到的结果,当w(z)\neq-1。当使用w '(z=0)>0的模型作为基准模型时,离散性显得很强;然而,即使在LCDM附近,它们也是显著的,其中忽略与DE状态方程相关联的自由度会导致物质密度参数Ω_m的错误估计。

英文摘要:

We investigate the impact of non-linear corrections on dark energy parameter estimation from weak lensing probes. We find that using halofit expressions, suited to LCDM models, implies substantial discrepancies with respect to results directly obtained from N-body simulations, when w(z)\neq-1. Discrepancies appear strong when using models with w'(z=0)>0, as fiducial models; they are however significant even in the neighborhood of LCDM, where neglecting the degrees of freedom associated with the DE state equation can lead to a misestimate of the matter density parameter Ω_m.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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