Circular motion of test particles around wormhole represented by exponential metric
Abstract
The motion of photons, neutral and charged particles around wormhole described by exponential metric which is the solution of the Einsteinscalar field equations has been studied. It is also proven that the wormhole solution is a special case of the wellknown JNW spacetime and that the scalar field corresponds to the phantom field which has the antigravitating repulsive feature. It is also shown that the characteristic radii, namely, innermost stable circular orbit (ISCO), marginally bound orbit (MBO) and photon sphere in the spacetime described by exponential metric are less than that obtained in the Schwarzschild spacetime. However, the size of the shadow of the wormhole is greater than the shadow of the Schwarzschild black hole. The energy efficiency in the spacetime described by exponential metric is relatively large than that in the Schwarzschild spacetime. Later it is assumed that the wormhole is embedded in the asymptotically uniform magnetic field which behaves similar to the dipolelike field near the origin. The dynamical motion of charged particles around the wormhole described by exponential metric implanted in the asymptotically uniform magnetic field has been studied assuming that charged particles are acted by gravitational and Lorentz forces, simultaneously. It is shown that the ISCO position for charged particle will be always less than that of neutral particle.
 Publication:

Physics of the Dark Universe
 Pub Date:
 March 2022
 DOI:
 10.1016/j.dark.2021.100946
 Bibcode:
 2022PDU....3500946T
 Keywords:

 Papapetrou spacetime;
 Wormhole solution;
 Geodesics;
 Curvature invariant;
 Gravitational lensing