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Title α-attractor and reheating in a model with noncanonical scalar fields
Type JournalPaper
Keywords Cosmological inflation; noncanonical scalar field; reheating; α-attractor; observational constraints.
Abstract We consider two noncanonical scalar fields [tachyon and Diarc–Born–Infeld (DBI)] with E-model type of the potential. We study cosmological inflation in these models to find possible α-attractors. We show that similar to the canonical scalar field case, in both tachyon and DBI models there is a value of the scalar spectral index in small α limit which is just a function of the e-folds number. However, the value of ns in DBI model is somewhat different from the other ones. We also compare the results with Planck2015 TT, TE, EE+lowP data. The reheating phase after inflation is studied in these models which gives some more constraints on the model parameters.
Researchers Kourosh Nozari (Second Researcher), Narges Rashidi Talouki (First Researcher)