Vacuumless topological defects in Lyra geometry

Details Vacuumless topological defects in Lyra geometry Vacuumless topological defects in Lyra geometry

2009-01-02

arxiv.org/abs/0901.0261v1

Astrophys.Space Sci.319:169-175,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 9 figures. To appear in Astrophys.Space.Sci

Scientific paper

10.1007/s10509-009-9979-8

Few years ago, Cho and Vilenkin have proposed that topological defects can arise in symmetry breaking models without having degenerate vacua. These types of defects are known as vacuumless defects. In the present work, the gravitational field of a vacuumless global string and global monopole have been investigated in the context of Lyra geometry. We find the metric of the vacuumless global string and global monopole in the weak field approximations. It has been shown that the vacuumless global string can have repulsive whereas global monopole exerts attractive gravitational effects on a test particle. It is dissimilar to the case studied in general relativity.

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