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Journal Article

Effects of curvature couplings for quantum fields on cosmic-string space-times


Allen,  Bruce
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Allen, B., & Ottewill, A. C. (1990). Effects of curvature couplings for quantum fields on cosmic-string space-times. Physical Review D, 42(8), 2669-2677. doi:10.1103/PhysRevD.42.2669.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-5CF9-D
The effect of ξR curvature coupling terms in the equation of motion of a massless scalar field are considered on a cosmic-string background. Realistic two- and four-dimensional models of a string, where the space-time curvature is spread over a region of nonzero size r0, are constructed. In two and four dimensions, the nonzero ξ term modifies the behavior within a region centered about the string, whose radius is proportional to r0; however, the constant of proportionality may be exponentially large. For the standard idealized string (a conical space-time) which has no intrinsic length scale, the effects of nonzero ξ do not appear.