8 papers
Multi-photon ring structure of reflection-asymmetric traversable thin-shell wormholes
Caio F. B. Macedo, João LuÃs Rosa, Diego Rubiera-Garcia +1
We consider the observational signatures of thin accretion disks around a reflection-asymmetric traversable thin-shell wormhole. This wormhole, built in the framework of Palatini $…
Sagittarius A* near-infrared flares polarization as a probe of space-time I: Non-rotating exotic compact objects
Nicolas Aimar, João LuÃs Rosa, Hanna Liis Tamm +1
The center of our galaxy hosts Sagittarius~A*, a supermassive compact object of solar masses, usually associated with a black hole. Nevertheless, black holes…
Twinkle twinkle dark star: Oscillating profiles from dark matter scalar solitons
Nicolas Aimar, Caio F. B. Macedo, João LuÃs Rosa +1
Real scalar fields, e.g. the axion, cannot condensate into stationary solitonic configurations to form starlike structures, eventually either dispersing or collapsing. However, by…
Shadows from thin accretion disks of parametrized black hole solutions
Gonzalo J. Olmo, João LuÃs Rosa, Diego Rubiera-Garcia +2
We discuss the optical appearance from thin accretion disks in parametrized black holes, namely, solutions characterized by an arbitrarily large number of parameters without any re…
Polarimetry imprints of exotic compact objects: relativistic fluid spheres and gravastars
Hanna Liis Tamm, Nicolas Aimar, João LuÃs Rosa
Recent observations of polarimetric parameters of active galactic nuclei motivate the study of polarization in the spacetime of exotic compact objects which can mimic the features…
Astrometric and polarimetric imprints of hot-spots orbiting parametrized black holes
João LuÃs Rosa, Nicolas Aimar, Diego Rubiera-Garcia
We analyze the observational features of hot-spots orbiting parametrized black hole (BH) spacetimes. We select a total of four BH spacetimes, two from the Johanssen-Psaltis (JP) pa…