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arXiv 2004.12074gr-qchep-th
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四维Gauss-Bonnet黑洞中具有球形吸积的阴影和光子球

Shadows and photon spheres with spherical accretions in the four-dimensional Gauss-Bonnet black hole

Xiao-Xiong Zeng, Hai-Qing Zhang, Hongbao Zhang

摘要:

本文研究了四维Gauss-Bonnet黑洞在静态球形吸积和下落球形吸积作用下的阴影和光子球。我们表明,在这两种情况下,阴影和光子球总是存在的。阴影和光子球的半径与高斯-邦纳常数固定的吸积轮廓无关,这意味着阴影是时空几何的一个特征,在这种情况下几乎不受吸积的影响。由于多普勒效应的影响,下落吸积物的阴影比静止吸积物的阴影暗。我们还研究了高斯-博内常数对阴影球和光子球的影响,发现高斯-博内常数越大,阴影球和光子球的半径越小。特别地,所观察到的比强度随着Gauss-Bonnet常数的增加而增加。

英文摘要:

We investigate the shadows and photon spheres of the four-dimensional Gauss-Bonnet black hole with the static and infalling spherical accretions. We show that for both cases, the shadow and photon sphere are always present. The radii of the shadow and photon sphere are independent of the profiles of accretion for a fixed Gauss-Bonnet constant, implying that the shadow is a signature of the spacetime geometry and it is hardly influenced by accretion in this case. Because of the Doppler effect, the shadow of the infalling accretion is found to be darker than that of the static one. We also investigate the effect of the Gauss-Bonnet constant on the shadow and photon sphere, and find that the larger the Gauss-Bonnet constant is, the smaller the radii of the shadow and photon sphere will be. In particular, the observed specific intensity increases with the increasing of the Gauss-Bonnet constant.

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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