Overproduction of cosmic superstrings

Details Overproduction of cosmic superstrings Overproduction of cosmic superstrings

2004-12-09

arxiv.org/abs/hep-th/0412095v2

JHEP0506:075,2005

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 16 figures, JHEP style; References added; Improved discussion of initial conditions

Scientific paper

10.1088/1126-6708/2005/06/075

We show that the naive application of the Kibble mechanism seriously underestimates the initial density of cosmic superstrings that can be formed during the annihilation of D-branes in the early universe, as in models of brane-antibrane inflation. We study the formation of defects in effective field theories of the string theory tachyon both analytically, by solving the equation of motion of the tachyon field near the core of the defect, and numerically, by evolving the tachyon field on a lattice. We find that defects generically form with correlation lengths of order M_s^{-1} rather than H^{-1}. Hence, defects localized in extra dimensions may be formed at the end of inflation. This implies that brane-antibrane inflation models where inflation is driven by branes which wrap the compact manifold may have problems with overclosure by cosmological relics, such as domain walls and monopoles.

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