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Astrophysical Bounds on Global Strings
Physical Review D
  • Shane L. Larson, Utah State University
  • William A. Hiscock
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Global topological defects produce nonzero stress energy throughout spacetime, and as a result can have observable gravitational influence on surrounding matter. Gravitational effects of global strings are used to place bounds on their cosmic abundance. The minimum separation between global strings is estimated by considering the defects' contribution to the cosmological energy density. More rigorous constraints on the abundance of global strings are constructed by examining the tidal forces such defects will have on observable astrophysical systems. The small number of observed tidally disrupted systems indicates there can be very few of these objects in the observable Universe.


Published by the American Physical Society in Physical Review D. Publisher PDF available through remote link.

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Citation Information
Larson, S. L., & Hiscock, W. A. (1997). Astrophysical bounds on global strings. Physical Review D, 56(6), 3242.