Pair production in the gravitational field of a cosmic string

Details Pair production in the gravitational field of a cosmic string Pair production in the gravitational field of a cosmic string

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phlb..240..322h&link_type=abstract

Physics Letters B, Volume 240, Issue 3-4, p. 322-326.

Physics

17

Scientific paper

We show that many elementary particle physics processes, such as pair production by a high energy photon, that take place in Minkowski space only if a non-uniform external field provides for momentum non-conservation, do occur in the space-time around a straight cosmic string, even though the space is locally flat and there is no local gravitational potential. We exemplify this mechanism through the evaluation of the cross section per unit length of string for the decay of a massless scalar particle into a pair of massive particles. The cross sections for this kind of processes are typically small. Nevertheless, it is interesting to realize how these reactions occur due to topological properties of space, rather than to the action of a local field.
V.S. is grateful to Mario Castagnino for hospitality at the Instituto de Astronomía y Física del Espacio during a visit while this work was done.

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