39 citations · 141 across the 15 of their papers we have counts for
15 papers
Twinkle twinkle dark star: Oscillating profiles from dark matter scalar solitons
Nicolas Aimar, Caio F. B. Macedo, João Luís 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…
Multi-photon ring structure of reflection-asymmetric traversable thin-shell wormholes
Caio F. B. Macedo, João Luís 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 $…
Polarimetry imprints of exotic compact objects: relativistic fluid spheres and gravastars
Hanna Liis Tamm, Nicolas Aimar, João Luís 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 Luís 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…
Shadows from thin accretion disks of parametrized black hole solutions
Gonzalo J. Olmo, João Luís 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…
Sagittarius A* near-infrared flares polarization as a probe of space-time I: Non-rotating exotic compact objects
Nicolas Aimar, João Luís 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…
Polarimetry imprints of exotic compact objects: solitonic boson stars
João Luís Rosa, Nicolas Aimar, Hanna Liis Tamm
In this work we analyze the polarization observational properties of solitonic boson stars orbited by spherical hot-spots emitting synchrotron radiation from a thermal distribution…
Bounds on the mass of superradiantly unstable scalar fields around Kerr black holes
Maurício Richartz, João Luís Rosa, Emanuele Berti
In this work we compute numerical bounds on the mass of superradiantly unstable scalar fields in a Kerr black hole background using the continued fraction method. We show that…
Accretion disks and relativistic line broadening in boson star spacetimes
João Luís Rosa, Joaquín Pelle, Daniela Pérez
In this work, we analyze the observational properties of static, spherically symmetric boson stars with fourth and sixth-order self-interactions, using the Julia-based general-rela…
Shadow of quadrupole-deformed compact objects in a local dark matter shell
Shokoufe Faraji, João Luís Rosa
This work investigates observational properties, namely the shadow and photon ring structure, of emission profiles originating near compact objects. In particular, we consider a di…
Optical appearance of black holes surrounded by a dark matter halo
Caio F. B. Macedo, João Luís Rosa, Diego Rubiera-Garcia
Black holes in General Relativity are described by space-time metrics that are simpler in comparison to non-vacuum compact objects. However, given the universality of the gravitati…
Quasibound state reminiscent in de-Sitter black holes: Quasinormal modes and the decay of massive fields
Mateus Malato Corrêa, Caio F. B. Macedo, João Luís Rosa
Massive perturbations in asymptotic flat black holes leave a distinct signature in their late-time evolution `tail': an oscillatory behavior modulated by the Compton wavelength of…
Observational imprints of gravastars from accretion disks and hot-spots
João Luís Rosa, Daniela S. J. Cordeiro, Caio F. B. Macedo +1
In this work, we analyze the observational properties of thin-shell gravastars under two astrophysical frameworks, namely surrounded by optically-thin accretion disks and orbited b…
Gravitationally induced matter creation in scalar-tensor gravity
Ricardo A. C. Cipriano, Tiberiu Harko, Francisco S. N. Lobo +2
In this work, we analyze the possibility of gravitationally induced matter creation in the so-called Energy-Momentum-Squared gravity (EMSG), i.e. gravity, in it…
Observational properties of hot-spots orbiting relativistic fluid spheres
Hanna Liis Tamm, João Luís Rosa
In this work we analyze the observational properties of relativistic fluid spheres when orbited by isotropically emitting sources, known as hot spots. We consider fluid star config…