Geodesic motion in the space-time of a cosmic string

Details Geodesic motion in the space-time of a cosmic string Geodesic motion in the space-time of a cosmic string

2010-07-06

arxiv.org/abs/1007.0863v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages including 14 figures; v2: references added, discussion on null geodesics extended, numerical results added

Scientific paper

We study the geodesic equation in the space-time of an Abelian-Higgs string and discuss the motion of massless and massive test particles. The geodesics can be classified according to the particles energy, angular momentum and linear momentum along the string axis. We observe that bound orbits of massive particles are only possible if the Higgs boson mass is smaller than the gauge boson mass, while massless particles always move on escape orbits. Moreover, neither massive nor massless particles can ever reach the string axis for non-vanishing angular momentum. We also discuss the dependence of light deflection by a cosmic string as well as the perihelion shift of bound orbits of massive particles on the ratio between Higgs and gauge boson mass and the ratio between symmetry breaking scale and Planck mass, respectively.

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