关于使用黑洞阴影作为标准标尺的担忧
Concerns regarding the use of black hole shadows as standard rulers
摘要：
最近，Tsupko等人提出了一个非常有趣的建议，即使用高红移超大质量黑洞（SMBH）的阴影作为标准标尺。原则上，这将使我们能够在红移范围内探测膨胀历史，否则这将是一个挑战。在本说明中，我们批判性地审查了这一建议，并确定了一些以前被忽视的重要问题。这些困难包括难以获得可靠的SMBH质量估计和达到所需的角分辨率，以及高红移SMBH的吸积动力学知识不足。虽然这些问题目前似乎阻止了高红移SMBH阴影被用作强大的标准标尺，但我们希望我们及早标记它们将有助于在实验可行时使这种探测在理论上成熟。
英文摘要：
Recently, Tsupko et al. have put forward the very interesting proposal to use the shadows of high-redshift supermassive black holes (SMBHs) as standard rulers. This would in principle allow us to probe the expansion history within a redshift range which would otherwise be challenging to access. In this note, we critically examine this proposal, and identify a number of important issues which had been previously overlooked. These include difficulties in obtaining reliable SMBH mass estimates and reaching the required angular resolution, and an insufficient knowledge of the accretion dynamics of high-redshift SMBHs. While these issues currently appear to prevent high-redshift SMBH shadows from being used as robust standard rulers, we hope that our flagging them early will help in making this probe theoretically mature by the time it will be experimentally feasible.
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