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4 papers found.
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Scalar pair production in a magnetic field in de Sitter universe

The production of scalar particles by the dipole magnetic field in de Sitter expanding universe is analyzed. The amplitude and probability of transition are computed using perturbative methods. A graphical study of the transition probability is performed obtaining that the rate of pair production is important in the early universe. Our results prove that in the process of pair...

Partial wave analysis of the Dirac fermions scattered from Reissner–Nordström charged black holes

The asymptotic form of Dirac spinors in the field of the Reissner–Nordström black hole is derived for the scattering states (with \(E>mc^2\)) obtaining the phase shifts of the partial wave analysis of Dirac fermions scattered from charged black holes. Elastic scattering and absorption are studied giving analytic formulas for the partial amplitudes and cross sections. A graphical...

Partial wave analysis of the Dirac fermions scattered from Schwarzschild black holes

Asymptotic analytic solutions of the Dirac equation, giving the scattering modes (of the continuous energy spectrum, \(E>mc^2\)) in Schwarzschild’s chart and Cartesian gauge, are used for building the partial wave analysis of Dirac fermions scattered by black holes. In this framework, the analytic expressions of the differential cross section and induced polarization degree are...

The Quantum Theory of the Free Maxwell Field on the de Sitter Expanding Universe

Ion I. Cotaescu 0 Cosmin Crucean 0 0 West University of Timisoara , V. Parvan Ave. 4 RO-300223 Timisoara, Romania The theory of the free Maxwell field in two moving frames on the de Sitter spacetime