For exact asymptotically flat hairy charged black holes with a dilaton potential, the shadow radius, photon-orbit Lyapunov exponent, and scalar quasinormal frequencies are computed, showing strong coupling dependence only near extremal charge.
Shadow of charged wormholes in Einstein-Maxwell-dilaton theory
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abstract
The study of shadow is quite prominent nowadays because of the ongoing Event Horizon Telescope\footnote{https://eventhorizontelescope.org/} observations. We construct the shadow images of charged wormholes in Einstein-Maxwell-dilaton (EMD) theory. The spacetime metric of the charged wormholes contains three charges: magnetic charge $P$, electric charge $Q$, and dilaton charge $\Sigma$. We evaluate the photon geodesics around the charged wormholes. We also calculate the effective potential and discuss its behavior with angular momentum $L$ and different values of charges $P$, $Q$, and $\Sigma$. A study of the shadow of charged wormholes reveals that the shadow has an effect of the charges $P$ and $Q$. The radius of the shadow increases with the magnetic charge $P$ as well as the electric charge $Q$. We also find that the dilaton charge does not affect the shadow of the charged wormholes.
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The shadow and quasinormal modes of the asymptotically flat hairy black holes with a dilaton potential
For exact asymptotically flat hairy charged black holes with a dilaton potential, the shadow radius, photon-orbit Lyapunov exponent, and scalar quasinormal frequencies are computed, showing strong coupling dependence only near extremal charge.