39 citations · 141 across the 15 of their papers we have counts for
6 papers · 1 filter
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…