Zobrazeno 1 - 10
of 140
pro vyhledávání: '"Macedo, Caio F B"'
In this work, we explore a Schwarzschild-like black hole within the framework of metric--affine bumblebee gravity. First, we investigate the behavior of the Kretschmann scalar and singularities in this modified gravity approach. Next, we introduce a
Externí odkaz:
http://arxiv.org/abs/2407.05321
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 objects can exhibit significant deviations from their GR counterparts.
Externí odkaz:
http://arxiv.org/abs/2404.02479
Publikováno v:
JCAP07(2024)046
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 gravitational pull, it is expected that dark matter accumulates around astrophy
Externí odkaz:
http://arxiv.org/abs/2402.13047
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 the field, which can be associated with the so-called quasibound state
Externí odkaz:
http://arxiv.org/abs/2401.15156
Publikováno v:
Phys. Rev. D 109, 084002 (2024)
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 by hot-spots. We consider the thin-shell gravastar model with two free
Externí odkaz:
http://arxiv.org/abs/2401.07766
Publikováno v:
Phys. Rev. Lett. 133, 121404 (2024)
Previous works have argued that future gravitational-wave detectors will be able to probe the properties of astrophysical environments where binary coalesce, including accretion disks, but also dark matter structures. Most analyses have resorted to a
Externí odkaz:
http://arxiv.org/abs/2312.06767
Publikováno v:
Phys. Rev. D 107, 124025 (2023)
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 radiating charges in cavities to low-energy excitations of massive degrees of
Externí odkaz:
http://arxiv.org/abs/2304.02039
Publikováno v:
Phys. Rev. D 108, 044021 (2023)
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 accretion disks. We consider two families of boson stars supported by quartic
Externí odkaz:
http://arxiv.org/abs/2303.17296
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 accretion disks may significantly enrich the field configurations of their sur
Externí odkaz:
http://arxiv.org/abs/2205.13569
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 holes and neutron stars, including their domain of existence and the amou
Externí odkaz:
http://arxiv.org/abs/2204.01684