560 citations · 3.5k across the 39 of their papers we have counts for
39 papers
Relativistic tidal divergences in circular orbits and the dynamics of light rings
Victor F. C. Vieira, Rafael P. Bernar, Caio F. B. Macedo
Tidal forces acting on orbiting bodies arise from inhomogeneities in the gravitational field, generating stresses that can deform or even disrupt these objects. In this work, we an…
Axial perturbations of hairy black holes in generalised scalar-tensor theories
Georgios Antoniou, Caio F. B. Macedo, Andrea Maselli +1
Gravitational wave observations can test the validity of General Relativity (GR) in the strong field regime. Certain classes of scalar-tensor theories indeed predict that compact o…
Extreme mass-ratio inspirals in ultra-light dark matter
Francisco Duque, Caio F. B. Macedo, Rodrigo Vicente +1
Previous works have argued that future gravitational-wave detectors will be able to probe the properties of astrophysical environments where binary coalesce, including accretion di…
Eternal binaries
Jaime Redondo-Yuste, Vitor Cardoso, Caio F. B. Macedo +1
The two-body problem is extensively studied in open systems and asymptotically flat spacetimes. However, there are many systems where radiation is trapped: they range from radiatin…
Imaging compact boson stars with hot-spots and thin accretion disks
João Luís Rosa, Caio F. B. Macedo, Diego Rubiera-Garcia
In this work we consider the observational properties of compact boson stars with self-interactions orbited by isotropically emitting (hot-spot) sources and optically thin accretio…
Tidal forces in dirty black hole spacetimes
Haroldo C. D. Lima Junior, Mateus M. Corrêa, Caio F. B. Macedo +1
Black holes can be inserted in very rich astrophysical environments, such as accretion disks. Although isolated black holes are simple objects in general relativity, their accretio…
Stable spontaneously-scalarized black holes in generalized scalar-tensor theories
Georgios Antoniou, Caio F. B. Macedo, Ryan McManus +1
It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black hol…
ECO-spotting: looking for extremely compact objects with bosonic fields
Vitor Cardoso, Caio F. B. Macedo, Kei-ichi Maeda +1
Black holes are thought to describe the geometry of massive, dark compact objects in the universe. To further support and quantify this long-held belief requires knowledge of possi…
Eccentricity evolution of compact binaries and applications to gravitational-wave physics
Vitor Cardoso, Caio F. B. Macedo, Rodrigo Vicente
Searches for gravitational waves from compact binaries focus mostly on quasi-circular motion, with the rationale that wave emission circularizes the orbit. Here, we study the gener…
The tune of the universe: the role of plasma in tests of strong-field gravity
Vitor Cardoso, Wen-di Guo, Caio F. B. Macedo +1
Gravitational-wave astronomy, together with precise pulsar timing and long baseline interferometry, is changing our ability to perform tests of fundamental physics with astrophysic…
Drifting through the medium: kicks and self-propulsion of binaries within accretion disks and other environments
Vitor Cardoso, Caio F. B. Macedo
Compact binaries are within the reach of gravitational and electromagnetic wave detectors, and are important for our understanding of astrophysical environments and the composition…
Scalar modes, spontaneous scalarization and circular null-geodesics of black holes in scalar-Gauss-Bonnet gravity
Caio F. B. Macedo
In general relativity, astrophysical black holes are simple objects, being described by just their mass and spin. These simple solutions are not exclusive to general relativity, as…
Axion boson stars
Davide Guerra, Caio F. B. Macedo, Paolo Pani
We study novel solitonic solutions to Einstein-Klein-Gordon theory in the presence of a periodic scalar potential arising in models of axion-like particles. The potential depends o…
Absorption by black hole remnants in metric-affine gravity
Adria Delhom, Caio F. B. Macedo, Gonzalo J. Olmo +1
Using numerical methods, we investigate the absorption properties of a family of nonsingular solutions {which arise in different metric-affine theories, such as quadratic and Born-…
Parametrized black hole quasinormal ringdown. II. Coupled equations and quadratic corrections for nonrotating black holes
Ryan McManus, Emanuele Berti, Caio F. B. Macedo +3
Linear perturbations of spherically symmetric spacetimes in general relativity are described by radial wave equations, with potentials that depend on the spin of the perturbing fie…
Ultralight boson cloud depletion in binary systems
Emanuele Berti, Richard Brito, Caio F. B. Macedo +2
Ultralight scalars can extract rotational energy from astrophysical black holes through superradiant instabilities, forming macroscopic boson clouds. This process is most efficient…
Self-interactions and Spontaneous Black Hole Scalarization
Caio F. B. Macedo, Jeremy Sakstein, Emanuele Berti +3
It has recently been shown that nontrivial couplings between a scalar and the Gauss-Bonnet invariant can give rise to black hole spontaneous scalarization. Theories that exhibit th…
Black holes with surrounding matter and rainbow scattering
Luiz C. S. Leite, Caio F. B. Macedo, Luís C. B. Crispino
The scattering of light by water droplets can produce one of the most beautiful phenomena in Nature: the rainbow. This optical phenomenon has analogues in molecular, atomic and nuc…
Parametrized black hole quasinormal ringdown. I. Decoupled equations for nonrotating black holes
Vitor Cardoso, Masashi Kimura, Andrea Maselli +3
Black hole solutions in general relativity are simple. The frequency spectrum of linear perturbations around these solutions (i.e., the quasinormal modes) is also simple, and there…
On the stability of scalarized black hole solutions in scalar-Gauss-Bonnet gravity
Hector O. Silva, Caio F. B. Macedo, Thomas P. Sotiriou +3
Scalar-tensor theories of gravity where a new scalar degree of freedom couples to the Gauss-Bonnet invariant can exhibit the phenomenon of spontaneous black hole scalarization. The…
Dynamical signatures of black holes in massive Chern-Simons gravity: Quasibound modes and time evolution
Caio F. B. Macedo
Dynamical Chern-Simons (dCS) gravity is a promising extension of general relativity (GR), arising naturally from the low-energy limit of some string motivated theories. Even though…
Spectral lines of extreme compact objects
Caio F. B. Macedo, Tom Stratton, Sam Dolan +1
We study the absorption of scalar fields by extreme/exotic compact objects (ECOs) -- horizonless alternatives to black holes -- via a simple model in which dissipative mechanisms a…
Orbital fingerprints of ultralight scalar fields around black holes
Miguel C. Ferreira, Caio F. B. Macedo, Vitor Cardoso
Ultralight scalars have been predicted in a variety of scenarios, and advocated as a possible component of dark matter. These fields can form compact regular structures known as bo…
Black holes in Einstein-Gauß-Bonnet-dilaton theory
Jose Luis Blázquez-Salcedo, Vitor Cardoso, Valeria Ferrari +9
Generalizations of the Schwarzschild and Kerr black holes are discussed in an astrophysically viable generalized theory of gravity, which includes higher curvature corrections in t…