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Phys. Rev. D 57, 6089–6093 (1998)

Instability of cosmological event horizons of nonstatic global cosmic strings. II. Perturbations of gravitational waves and massless scalar fields

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José A. C. Nogales*
Instituto de Física, Universidade Federal Fluminense, Av. Litorânea s/n - Boa Viagen, CEP 24210-340 Niterói – RJ, Brazil
Instituto de Física, Universidad Mayor de San Andres (UMSA), Casilla 3553, La Paz – Bolivia

Anzhong Wang†
Departamento de Física Teórica, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Maracanã, 20550-013 Rio de Janeiro – RJ, Brazil

Received 21 November 1997; published in the issue dated 15 May 1998

The stability of the cosmological event horizons (CEHs) of a class of nonstatic global cosmic strings is studied against perturbations of gravitational waves and massless scalar fields. It is found that the perturbations of gravitational waves always turn the CEHs into nonscalar weak spacetime curvature singularities, while the ones of massless scalar fields turn the CEHs either into nonscalar weak singularities or into scalar ones depending on the particular cases considered. The perturbations of test massless scalar fields are also studied, and it is found that they do not always give the correct prediction.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.57.6089
DOI:
10.1103/PhysRevD.57.6089
PACS:
98.80.Cq, 04.20.Jb, 04.40.Nr

*Email address: jnogales@portela.if.uff.br

†Email address: wang@symbcomp.uerj.br

 
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