Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2012-01-27
Physics
High Energy Physics
High Energy Physics - Theory
arXiv admin note: text overlap with arXiv:1108.0336
Scientific paper
The problem of particle creation from vacuum in a flat Robertson-Walker space-time in the presence of electromagnetic fields is studied. Two sets of exact solutions for the Klein Gordon equation with varying electric field and constant magnetic field are given. Then the canonical method based on Bogoliubov transformation is applied to calculate the pair creation probability and the density number of created particles. The particular case of radiation dominated universe is discussed. The vacuum to vacuum transition probability is calculated and the imaginary part of the effective action is extracted. It is shown that the electric field amplifies gravitational particle creation while the magnetic field minimizes it.
Chekireb R.
Haouat S.
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