arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2403.02115astro-ph.CO
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使用神经网络约束原初非高斯性

Constraining primordial non-Gaussianity using Neural Networks

Chandan G. Nagarajappa, Yin-Zhe Ma

AI总结:

本研究提出利用卷积神经网络直接从CMB图中估计原初非高斯性参数$f_{\ m NL}$,相比传统统计方法显著降低了复杂度,并在模拟数据上验证了估计的无偏性,为CMB图像的宇宙学参数估计提供了新途径。

摘要:

我们提出了一种新方法,直接从宇宙微波背景(CMB)图中估计原初非高斯性参数($f_{\ m NL}$)的值,使用的是卷积神经网络(CNN)。传统方法依赖复杂的统计技术,而本研究提出了一种更简单的方法,利用神经网络来估计$f_{\ m NL}$。该神经网络模型在已知$f_{\ m NL}$值范围为$[-50,50]$的模拟CMB图上进行训练,并使用各种指标评估其性能。结果表明,与传统方法相比,该方法能够从CMB图中准确估计$f_{\ m NL}$值,且复杂度显著降低。使用$500$个验证数据,$f^{\ m output}_{\ m NL}$相对于$f^{\ m input}_{\ m NL}$的图可以拟合为$y=ax+b$,其中$a=0.980^{+0.098}_{-0.102}$,$b=0.277^{+0.098}_{-0.101}$,表明原初非高斯性估计的无偏性。结果表明,CNN技术可以广泛应用于直接从CMB图像中进行其他宇宙学参数估计。

英文摘要:

We present a novel approach to estimate the value of primordial non-Gaussianity ($f_{\rm NL}$) parameter directly from the Cosmic Microwave Background (CMB) maps using a convolutional neural network (CNN). While traditional methods rely on complex statistical techniques, this study proposes a simpler approach that employs a neural network to estimate $f_{\rm NL}$. The neural network model is trained on simulated CMB maps with known $f_{\rm NL}$ in range of $[-50,50]$, and its performance is evaluated using various metrics. The results indicate that the proposed approach can accurately estimate $f_{\rm NL}$ values from CMB maps with a significant reduction in complexity compared to traditional methods. With $500$ validation data, the $f^{\rm output}_{\rm NL}$ against $f^{\rm input}_{\rm NL}$ graph can be fitted as $y=ax+b$, where $a=0.980^{+0.098}_{-0.102}$ and $b=0.277^{+0.098}_{-0.101}$, indicating the unbiasedness of the primordial non-Gaussianity estimation. The results indicate that the CNN technique can be widely applied to other cosmological parameter estimation directly from CMB images.

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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