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Gauge-flation vs chromo-natural inflation

By M.M. Sheikh-Jabbari


AbstractGauge-flation, non-Abelian gauge field inflation, which was introduced in Maleknejad and Sheikh-Jabbari (2011) [4] and analyzed more thoroughly in Maleknejad and Sheikh-Jabbari (2011) [5], is a model of inflation driven by non-Abelian gauge fields minimally coupled to Einstein gravity. In this model a certain rotationally invariant combination of gauge fields plays the role of the inflaton. Recently, the chromo-natural inflation model was proposed (Adshead and Wyman, 2012 [8]) which besides the non-Abelian gauge fields also involves an axion field. In this short Letter we show that the model involving axions, indeed allows for various slow-roll trajectories for different values of its parameters: A specific trajectory discussed in Adshead and Wyman (2012) [8] starts from a “small axion” region, while the trajectory considered in Maleknejad and Sheikh-Jabbari (2011) [4,5] corresponds to a “large axion” region

Publisher: Elsevier B.V.
Year: 2012
DOI identifier: 10.1016/j.physletb.2012.09.014
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