Bremsstrahlung in the gravitational field of a cosmic string

Details Bremsstrahlung in the gravitational field of a cosmic string Bremsstrahlung in the gravitational field of a cosmic string

1994-05-26

arxiv.org/abs/gr-qc/9405064v1

Phys.Rev. D49 (1994) 6576-6586

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, to appear in Phys. Rev. D., KONS-RGKU-94-06

Scientific paper

10.1103/PhysRevD.49.6576

In the framework of QED we investigate the bremsstrahlung process for an electron passing by a straight static cosmic string. This process is precluded in empty Minkowski space-time by energy and momentum conservation laws. It happens in the presence of the cosmic string as a consequence of the conical structure of space, in spite of the flatness of the metric. The cross section and emitted electromagnetic energy are computed and analytic expressions are found for different energies of the incoming electron. The energy interval is divided in three parts depending on whether the energy is just above electron rest mass $M$, much larger than $M$, or exceeds $M/\delta$, with $\delta$ the string mass per unit length in Planck units. We compare our results with those of scalar QED and classical electrodynamics and also with conic pair production process computed earlier.

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