It seems surprising that the emissivity properties of the accretion disk (à la Page and Thorne)
surrounding the Gibbons–Maeda–Garfinkle–Horowitz–Strominger (GMGHS) black holes of …

A new rotating generalization of the Damour–Solodukhin wormhole (RDSWH), called Kerr-
like wormhole, has recently been proposed and investigated by Bueno et al. for echoes in …

The Fe Kα fluorescent line at 6.4 keV is a powerful probe of the space–time metric in the
vicinity of accreting compact objects. We investigated here how some alternative theories of …

Astrophysical black holes are thought to be Kerr solution of general relativity but there is not
yet observational evidence to prove them. One can study the emission of electromagnetic …

There is a renewed interest in wormholes after it has been realized that they can mimic post-
merger ring-down initial QNM spectrum of gravitational waves. To our knowledge, this …