D-term inflation in non-minimal supergravity

Details D-term inflation in non-minimal supergravity D-term inflation in non-minimal supergravity

2006-07-27

arxiv.org/abs/hep-th/0607226v2

JCAP0611:001,2006

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, 9 figures; minor changes to match publihed version

Scientific paper

10.1088/1475-7516/2006/11/001

D-term inflation is one of the most interesting and versatile models of inflation. It is possible to implement naturally D-term inflation within high energy physics, as for example SUSY GUTs, SUGRA, or string theories. D-term inflation avoids the $\eta$-problem, while in its standard form it always ends with the formation of cosmic strings. Given the recent three-year WMAP data on the cosmic microwave background temperature anisotropies, we examine whether D-term inflation can be successfully implemented in non-minimal supergravity theories. We show that for all our choices of K\"ahler potential, there exists a parameter space for which the predictions of D-term inflation are in agreement with the measurements. The cosmic string contribution on the measured temperature anisotropies is always dominant, unless the superpotential coupling constant is fine tuned; a result already obtained for D-term inflation within minimal supergravity. In conclusion, cosmic strings and their r\^ole in the angular power spectrum cannot be easily hidden by just considering a non-flat K\"ahler geometry.

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