Hiding cosmic strings in supergravity D-term inflation

Abstract

The influence of higher-order terms in the Kähler 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.

15 pages, 4 figures

References in corpus (4)

• Hilltop Inflation
• Bounds on Cosmic Strings from WMAP and SDSS
• D3/D7 Brane Inflation and Semilocal Strings
• $D$-term inflation, cosmic strings, and consistency with cosmic microwave background measurement

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