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Geodesic structure of Janis-Newman-Winicour space-time
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abstract
In the present paper we study the geodesic structure of the Janis-Newman-Winicour(JNW) space-time which contains a strong curvature naked singularity. This metric is an extension of the Schwarzschild geometry when a massless scalar field is included. We find that the strength parameter $\mu$ of the scalar field effects on the geodesic structure of the JNW space-time. By solving the geodesic equation and analyzing the behavior of effective potential, we investigate all geodesic types of the test particle and the photon in the JNW space-time. At the same time we simulate all the geodesic orbits corresponding to the energy levels of the effective potential in the JNW space-time.
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Bound orbits near scalar field naked singularities
In scalar field naked singularities the lapse function has a global minimum, creating a stable static orbit for zero-angular-momentum particles that can mimic a black hole shadow, and nearby bound orbits precess backwards.
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