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arXiv 2009.07657gr-qchep-th
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有理非线性电动力学中M87 * 黑洞的影子

The shadow of M87* black hole within rational nonlinear electrodynamics

S. I. Kruglov

摘要:

我们考虑有理非线性电动力学与拉格朗日${\cal L} = -{\cal F}/(1+2β{\cal F})$(${\cal F}=(1/4)F_{μν}F^{μν}$是洛伦兹不变量),在[63]中提出,耦合到广义相对论。确定了规则非旋转磁性黑洞的阴影尺寸,并与事件视界望远镜合作组拍摄的超大质量M87* 黑洞的阴影尺寸进行了比较。假设黑洞质量具有纯电磁性质,我们得到了黑洞的磁荷。得到的阴影大小非常接近非正则中性史瓦西黑洞的阴影大小。因此,我们可以将超大质量M87* 黑洞解释为规则(无奇点)磁化的黑洞。

英文摘要:

We consider rational nonlinear electrodynamics with the Lagrangian ${\cal L} = -{\cal F}/(1+2β{\cal F})$ (${\cal F}=(1/4)F_{μν}F^{μν}$ is the Lorentz-invariant), proposed in [63], coupled to General Relativity. The effective geometry induced by nonlinear electrodynamics corrections are found. We determine shadow's size of regular non-rotating magnetic black holes and compare them with the shadow size of the super-massive M87* black hole imaged by the Event Horizon Telescope collaboration. Assuming that the black hole mass has a pure electromagnetic nature, we obtain the black hole magnetic charge. The size of the shadow obtained is very close to the shadow size of non-regular neutral Schwarzschild black holes. As a result, we can interpret the super-massive M87* black hole as a regular (without singularities) magnetized black hole.

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