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Paper IPM / P / 11777  


Abstract:  
In [arXiv:1102.1513] we introduced an inflationary scenario, NonAbelian Gauge Field Inflation or gaugeflation for short, in which slowroll inflation is driven by nonAbelian gauge field minimally coupled to gravity. We present a more detailed analysis, both numerical and analytical, of the gaugeflation. By studying the phase diagrams of the theory, we show that getting enough number of efolds during a slowroll inflation is fairly robust to the choice of initial gauge field values. In addition, we present a detailed analysis of the cosmic perturbation theory in gaugeflation which has many special and interesting features compared the standard scalardriven inflationary models. The specific gaugeflation model we study in this paper has two parameters, a cutoff scale Lambda and the gauge coupling g. Fitting our results with the current cosmological data fixes 10 H 10^15 GeV (H is the Hubble parameter) and g 10^4, which are in the natural range of parameters in generic particle physics beyond standard models. Our model also predicts a tensortoscalar ratio r>0.05, in the range detectable by the Planck satellite.
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