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Article
Open AccessQuasinormal modes in noncommutative Schwarzschild black holes: a spectral analysis
We present a comprehensive analysis of quasinormal modes (QNMs) for noncommutative geometry-inspired Schwarzschild black holes, encompassing both non-extreme and extreme cases. By employing a spectral method, ...
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Article
Open AccessRings of light caused by gravitational waves
We reconsider the case of the geodesic motion of a massive and massless beam of test particles in a gravitational wave. In particular, we use a direct Lagrangian approach which simplifies the calculation. Our ...
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Article
Hamiltonian Structure of the Schrödinger Classical Dynamical System
The connection between quantum mechanics and classical statistical mechanics has motivated in the past the representation of the Schrödinger quantum-wave equation in terms of “projections” onto the quantum con...
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Article
Electrovac universes with a cosmological constant
We present the extension of the Einstein-Maxwell system called electrovac universes by introducing a cosmological constant Λ. In the absence of the Λ term, the crucial equation in solving the Einstein-Maxwell ...
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Article
Velocity and velocity bounds in static spherically symmetric metrics
We find simple expressions for velocity of massless particles with dependence on the distance, r, in Schwarzschild coordinates. For massive particles these expressions give an upper bound for the velocity. Our re...
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Article
The hypergeneralized Heun equation in quantum field theory in curved space-times
We show for the first time the role played by the hypergeneralized Heun equation (HHE) in the context of quantum field theory in curved space-times. More precisely, we find suitable transformations relating th...
