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Using shadow of black hole to examine the energy exchange between axion matter and rotating black hole
We find that a \textit{slowly} rotating axion-modified black hole resulting from the backreaction of an axion field on a rotating Kerr black hole can have a \textit{D-shaped} shadow as that for a \textit{highly} counter-rotating Kerr black hole. This attributes to the fact that the energy exchange between the axion matter …