A5052636430- Black Holes and Theoretical Physics
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
Centro Brasileiro de Pesquisas Físicas
2019-2022
Quasinormal modes are characteristic oscillatory that control the relaxation of a perturbed physical system back to its equilibrium state. In this work, we calculate QNM frequencies and angular eigenvalues Kerr--de Sitter black holes using novel method based on conformal field theory. The spin-field perturbation equations background spacetime essentially reduce two Heun's equations, one for radial part part. We use accessory parameter expansion equation, obtained via isomonodromic...
Rotating and/or charged black hole spacetimes possess a Cauchy horizon, beyond which Einstein's equations of General Relativity cease to be deterministic. This led the formulation Strong Cosmic Censorship conjecture that such horizons become irregular under field perturbations. We consider linear perturbations rotating and electrically-charged (Kerr-Newman-de Sitter) holes in universe with positive cosmological constant. By calculating quasinormal modes for scalar fermion fields, we provide...
The scalar scattering cross section is computed for Schwarzschild-Tangherlini black holes on the brane. sections are numerically via partial-wave method. phase shifts found and also Born approximation. It shown that spacetimes with more than six dimensions present a finite in all directions.