人马座A和M87周围的阴影作为测试引力理论的工具

Q4 Physics and Astronomy

Astronomical and Astrophysical Transactions Pub Date : 2022-08-14 DOI:10.17184/eac.7531

A. Zakharov

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引用次数: 4

摘要

在具有额外维度的Randall-Sundrum理论框架下，发现了具有潮汐电荷的Reissner-Nordstrom黑洞解。根据2017年4月事件视界望远镜(EHT)的观测，2019年重建了M87超大质量黑洞周围的阴影。在2022年5月，EHT合作展示了我们银河系中心阴影重建的结果。早先，对于Reissner-Nordstrom度量，我们导出了阴影大小作为电荷函数的解析表达式，后来将这些结果推广到潮汐电荷的情况。我们讨论了利用EHT合作完成的阴影大小估计来评估重力替代理论参数的机会，特别是潮汐电荷可以从这些观测中估计出来。

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Shadows around Sgr A* and M87* as a tool to test gravity theories

In the framework of Randall–Sundrum theory with extra dimension Reissner–Nordstrom black hole solutions with a tidal charge have been found. The shadow around the supermassive black hole in M87 was reconstructed in 2019 based on observations with the Event Horizon Telescope (EHT) in April 2017. In May 2022 the EHT Collaboration presented results of a shadow reconstruction for our Galactic Center. Earlier, for Reissner–Nordstrom metric we derived analytical expressions for shadow size as a function of charge and later generalized these results for a tidal charge case. We discuss opportunities to evaluate parameters of alternative theories of gravity with shadow size estimates done by the EHT Collaboration, in particular, a tidal charge could be estimated from these observations.

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来源期刊

Astronomical and Astrophysical Transactions Physics and Astronomy-Instrumentation

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： Astronomical and Astrophysical Transactions (AApTr) journal is being published jointly by the Euro-Asian Astronomical Society and Cambridge Scientific Publishers, The journal provides a forum for the rapid publication of material from all modern and classical fields of astronomy and astrophysics, as well as material concerned with astronomical instrumentation and related fundamental sciences. It includes both theoretical and experimental original research papers, short communications, review papers and conference reports.