Deducing neutron star equation of state from telescope spectra with machine-learning-derived likelihoods
Deducing neutron star equation of state from telescope spectra with machine-learning-derived likelihoods
复制标题
利用机器学习推导的似然度从望远镜光谱中推导出中子星状态方程
DOI:
10.1088/1475-7516/2023/12/022
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发表时间:
2023
影响因子:
6.4
通讯作者:
Weber, Fridolin
中科院分区:
文献类型:
--
作者:
Farrell, Delaney;Baldi, Pierre;Ott, Jordan;Ghosh, Aishik;Steiner, Andrew W.;Kavitkar, Atharva;Lindblom, Lee;Whiteson, Daniel;Weber, Fridolin
The interiors of neutron stars reach densities and temperatures beyond the limits of terrestrial experiments, providing vital laboratories for probing nuclear physics. While the star's interior is not directly observable, its pressure and density determine the star's macroscopic structure which affects the spectra observed in telescopes. The relationship between the observations and the internal state is complex and partially intractable, presenting difficulties for inference. Previous work has focused on the regression from stellar spectra of parameters describing the internal state. We demonstrate a calculation of the full likelihood of the internal state parameters given observations, accomplished by replacing intractable elements with machine learning models trained on samples of simulated stars. Our machine-learning-derived likelihood allows us to perform maximum a posteriori estimation of the parameters of interest, as well as full scans. We demonstrate the technique by inferring stellar mass and radius from an individual stellar spectrum, as well as equation of state parameters from a set of spectra. Our results are more precise than pure regression models, reducing the width of the parameter residuals by 11.8% in the most realistic scenario. The neural networks will be released as a tool for fast simulation of neutron star properties and observed spectra.
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DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
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通讯作者:
D. Psaltis
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作者:
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通讯作者:
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DOI:
--
发表时间:
2000
期刊:
影响因子:
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