From the 2 of 11 linked papers with an AI index.
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Exploring a phantom Dirac-Born-Infeld regular black hole via particle emission, wave scattering and geodesics
N. Heidari, A. A. Araújo Filho, Iarley P. Lobo +1
We examine particle creation, evaporation, scalar wave absorption and scattering, and geodesic motion in the asymptotically flat regular black hole supported by a phantom Dirac-Bor…
Gravitational wave propagation in HoÅava-Lifshitz gravity
A. A. Araújo Filho, J. L. A. Silva, N. Heidari +3
We investigate the generation and propagation of gravitational waves in the leading parity-even infrared truncation of HoÅava-Lifshitz gravity, characterized by the modified tenso…
Fermi Acceleration Mechanisms Beyond Lorentz Symmetry
Gilson A. Ferreira, Erick Aguiar, A. A. Araújo Filho +3
The authors construct models of first- and second-order Fermi acceleration that include generic frame transformations, dispersion relations, and conservation laws, and study how de…
Gauge-covariant Raychaudhuri dynamics for spin-nondegenerate Lorentz-violating congruences
A. A. Araújo Filho, A. F. Santos, J. A. A. S. Reis +2
The paper derives a gauge‑covariant form of the Raychaudhuri equation for charged particle congruences with Lorentz‑violating dispersion relations, showing how electromagnetic fiel…
Shadows and lensing signatures of a rotating black hole in a Hernquist dark matter halo
A. A. Araújo Filho, Arun Kumar, N. Heidari +3
We investigate the optical properties of a rotating black hole immersed in a Hernquist dark matter halo. The spacetime is generated from a static Hernquist black hole through the n…
Lorentz-violating modifications to particle dynamics, thermodynamics and vacuum energy in bumblebee gravity
A. A. Araújo Filho, K. E. L. de Farias, E. Passos +5
We investigate how spontaneous Lorentz symmetry breaking in bumblebee gravity modifies particle dynamics, thermodynamics, and vacuum energy around a static black hole background. S…