Vacuum fluctuations outside cosmic strings

Details Vacuum fluctuations outside cosmic strings Vacuum fluctuations outside cosmic strings

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvd..34.1918h&link_type=abstract

Physical Review D (Particles and Fields), Volume 34, Issue 6, 15 September 1986, pp.1918-1920

Physics

104

Theory Of Quantized Fields

Scientific paper

The vacuum stress-energy tensor for a conformal scalar field in the exterior spacetime of a straight cosmic string is calculated. The tensor is traceless, falls off as the fourth power of the distance from the string, and is proportional to the linear mass density of the string c2μ/G in the physically reasonable case μ<<1. The linear energy density arising from the vacuum fluctuations is small compared with the linear mass-energy density of the string itself. A quasiregular singularity which appears in the exterior spacetime of a cosmic string with (1/4)<μ<(1/2) is shown to be unstable as a consequence of divergent vacuum fluctuations.

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