مشخصات پژوهش

خانه /Tachyon mimetic inflation as ...
عنوان
Tachyon mimetic inflation as an instabilities-free model
نوع پژوهش مقاله چاپ‌شده
کلیدواژه‌ها
Cosmology, Inflation, Perturbations
چکیده
We consider the mimetic tachyon model in the Lagrange multiplier approach. We study both the linear and nonlinear perturbations and find the perturbation and non-Gaussianity parameters in this setup. By adopting two types of the scale factor as the power-law (a ¼ a0tn) and intermediate (a ¼ a0 expðbtβÞ) scale factors, we perform a numerical analysis on the model which is based on Planck2018 TT, TE, EE+lowE +lensing +BAO +BK14 and Planck2018 TTT, EEE, TTE and EET datasets. We show that the mimetic tachyon model with both the power-law and intermediate scale factors, in some ranges of its parameter space is instabilities-free and observationally viable. The power-law mimetic tachyon model with 26.3 < n < 33.0 and the intermediate mimetic tachyon model with 0.116 < β < 0.130 are consistent with observational data and free of the ghost and gradient instabilities.
پژوهشگران نرگس رشیدی تلوکی (نفر اول)، کوروش نوذری (نفر دوم)