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Paper IPM / Astronomy / 16274  


Abstract:  
The scenario of constantroll inflation is studied where the inflaton is a scalar field with modified kinetic term, known as noncanonical scalar field. This modification leads to some changes in the slowroll parameters, and also by taking the second slowroll parameter as a constant, the differential equation for the Hubble parameter is altered as well. Assuming Î·=Î² and reconsidering the perturbation equations makes it clear that there should be some modified terms in the scalar spectral index and amplitude of scalar perturbations. After finding the exact solution, the main perturbation parameters are obtained at the horizon crossing time. Then by plotting the râns diagram it is shown that for some specific values of Î² one could find a good agreement with observational data. In addition, considering the attractor behavior of the model leads to this result that this feature could be appropriately satisfied.
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