Observing the shadow of Einstein-Maxwell-Dilaton-Axion black hole
By Shao-Wen Wei, Yu-Xiao Liu. 2013
306 citations recorded by the source corpus.
In this paper, the shadows cast by Einstein-Maxwell-Dilaton-Axion black hole and naked singularity are studied. The shadow of a rotating black hole is found to be a dark zone covered by a deformed circle. For a fixed value of the spin a, the size of the shadow decreases with the dilaton parameter b. The distortion of the shadow monotonically increases with b and takes its maximal when the black hole approaches to the extremal case. Due to the optical properties, the area of the black hole shadow is supposed to equal to the high-energy absorption cross section. Based on this assumption, the energy emission rate is investigated. For a naked singularity, the shadow has a dark arc and a dark spot or straight, and the corresponding observables are obtained. These results show that there is a significant effect of the spin a and dilaton parameter b on these shadows. Moreover, we examine the observables of the shadow cast by the supermassive black hole at the center of the Milky Way, which is very useful for us to probe the nature of the black hole through the astronomical observations in the near future.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/75ca1a556ecceca9877b1d070ceff40cfea6b4db
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Citations in the corpus
- Testing black hole candidates with electromagnetic radiation (2015, unknown): “…& Eiroa, 2012, 2013; Amarilla et al., 2010; Atamurotov et al., 2013a,b; Bambi, 2013f; Bambi et al., 2012; Bambi & Freese, 2009; Bambi & Yoshida, 2010; Ghasemi-Nodehi et al., 2015; Johannsen & Psaltis, 2010; Li & Bambi, 2014a; Schee & Stuchĺık, 2009; Tsukamoto et al., 2014; Wei & Liu, 2013).”
- Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theory (2019, background): “Some notable results of black hole shadows are already discussed in the literature, to list a few: Schwarzschild black hole surrounded by a Bach-Weyl ring [7]; Einstein-dilaton-Gauss-Bonnet black hole [8]; Konoplya-Zhidenko or more general parameterized black holes [9, 10]; Einstein-Maxwell-ChernSim”
- Shadow and quasinormal modes of a rotating loop quantum black hole (2020, background): “[16] S.”