Static cosmic strings in Brans-Dicke theory

Details Static cosmic strings in Brans-Dicke theory Static cosmic strings in Brans-Dicke theory

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvd..56.3706s&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 56, Issue 6, 15 September 1997, pp.3706-3710

Other

18

Extended Classical Solutions, Cosmic Strings, Domain Walls, Texture, Exact Solutions, Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity

Scientific paper

The gravitational fields of both local and global static cosmic strings in the context of Brans-Dicke theory are investigated. It is shown that, for a local cosmic string, Vilenkin's prescription for the energy-momentum tensor due to the string is inconsistent with the Brans-Dicke theory. For the global string, two kinds of solutions for the spacetime outside the string core have been presented, one of which is given in a closed form and may be nonsingular at a finite distance from the string core while the other one cannot be written in a closed form and moreover contains a singularity at a finite distance from the string core. The motions of photons and timelike particles in the field of the global string are also investigated in one of the cases. It has been shown that such a global cosmic string has only a repulsive gravitational effect on a freely moving particle.

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