Wormholes without exotic matter: quasinormal modes, echoes and shadows

Abstract

An analytical solution representing traversable asymptotically flat and symmetric wormholes was obtained without adding exotic matter in two different theories independently: in the Einstein-Maxwell-Dirac theory and in the second Randall-Sundrum brane-world model. Further, a smooth normalizable asymmetric wormhole solution has been recently obtained numerically in the Einstein-Maxwell-Dirac theory. Using the time-domain integration method we study quasinormal ringing of all these wormholes with emphasis to the regime of mimicking the near extremal Reissner-Nordström black holes, which is characterised by echoes. In addition, we calculate radius of shadows cast by these wormholes.

16 pages, 3 figures

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• Quasi normal modes of a Casimir--like traversable wormhole through the semi-analytical WKB approach
• Einstein-Dirac-Maxwell wormholes in quantum field theory
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