Hiding cosmic strings in supergravity D-term inflation

Details Hiding cosmic strings in supergravity D-term inflation Hiding cosmic strings in supergravity D-term inflation

2005-08-16

arxiv.org/abs/hep-ph/0508172v2

Phys.Rev. D73 (2006) 023508

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures

Scientific paper

10.1103/PhysRevD.73.023508

The influence of higher-order terms in the K\"{a}hler potential of the supergravity D-term inflation model on the density perturbation is studied. We show that these terms can make the inflaton potential flatter, which lowers the energy scale of inflation under the COBE/WMAP normalization. As a result, the mass per unit length of cosmic strings, which are produced at the end of inflation, can be reduced to a harmless but detectable level without introducing a tiny Yukawa coupling. Our scenario can naturally be implemented in models with a low cut-off as in Type I or Type IIB orientifold models.

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