报告人：郭俊起（济南大学）

时间：2021年4月2日15:50开始

腾讯会议ID:896 589 055（无密码）

摘要:We investigate the thermal properties of accretion disks in a spacetime for some galactic density profiles in spherical symmetry. The matter distributions have a finite outer radius with a naked central singularity. The luminosities of the accretion disks for some density profile models are found to be higher than those for a Schwarzschild black hole of the same mass. The slopes for the luminosity distributions with respect to frequencies are significantly different, especially at higher frequencies, from that in the Schwarzschild black hole case. Such features may be used to distinguish black holes from naked singularities. The efficiencies for the conversion of mass energy of the accreting gas into radiation and the strength of naked singularities are analyzed. The novel feature that we find is, the strength of the singularity is different depending on the profiles considered, and the stronger the singularity is, the higher is the efficiency for the accretion disk.

简介:郭俊起，济南大学物理科学与技术学院讲师。研究方向为引力塌缩、时空奇点、黑洞物理学与数值相对论。

联系人：张林

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