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arXiv 2109.09407gr-qc
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Lorentz对称性破缺的质量引力下物质在黑洞上的吸积

Accretion of matter onto black holes in massive gravity with Lorentz symmetry breaking

Abdul Jawad, Kimet Jusufi, M. Umair Shahzad

摘要:

本文研究了在Lorentz对称性自发破缺的大质量引力理论中物质在黑洞上的吸积以及由下落吸积流获得的阴影像。这个黑洞解的特征是质量$M$、标量电荷$S$和参数$λ$。为了提取我们分析的天体物理结果,首先,我们假设了一个特定的范围内的参数$λ$约束标量电荷$S$使用EHT的结果。为此,我们研究了标量荷对黑洞电磁辐射强度的影响。此外,我们还研究了流体流向大质量引力黑洞的多方和等温吸积行为,发现吸积过程从超音速/亚音速流开始,通过特定模型参数下的临界点,在视界附近结束。我们还分析了在各种流体的存在下,这表明重要的签名的质量吸积率。我们还阐述了利用阴影形式分析黑洞的相变和稳定性的可能性。

英文摘要:

In this paper we study the accretion of matter onto the black holes and the shadow images obtained by an infalling accretion flow of gas in a theory of massive gravity (MG) with a spontaneously breaking Lorentz symmetry. This black hole solution is characterized by mass $M$, scalar charge $S$ and the parameter $λ$. In order to extract the astrophysical results of our analyses, firstly, we have assumed a specific range for the parameter $λ$ to constrain the scalar charge $S$ using the EHT result. To this end, we have studied the effect of the scalar charge on the intensity of the electromagnetic radiation from the black hole. Moreover, we investigate the behavior of polytropic as well as the isothermal fluid flow onto massive gravity black hole and notice that accretion starts from supersonic/subsonic flow, passes through the critical point using particular model parameter and ends near the horizon. We also analyzed the mass accretion rate in the presence of various fluids which indicates important signatures. We also elaborate on the possibility to analyze the phase transition and the stability of the black hole using the shadow formalism.

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