Effective action and motion of a cosmic string

Details Effective action and motion of a cosmic string Effective action and motion of a cosmic string

1997-07-11

arxiv.org/abs/hep-ph/9707324v1

Phys.Rev. D56 (1997) 8014-8028

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages revtex, 12 figures

Scientific paper

10.1103/PhysRevD.56.8014

We examine the leading order corrections to the Nambu effective action for the motion of a cosmic string, which appear at fourth order in the ratio of the width to radius of curvature of the string. We determine the numerical coefficients of these extrinsic curvature corrections, and derive the equations of motion of the worldsheet. Using these equations, we calculate the corrections to the motion of a collapsing loop, a travelling wave, and a helical breather. From the numerical coefficients we have calculated, we discuss whether the string motion can be labelled as `rigid' or `antirigid,' and hence whether cusp or kink formation might be suppressed or enhanced.

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