Tachyon inflation in teleparallel gravity

The European Physical Journal C, Apr 2019

We present a tachyonic field inflationary model in a teleparallel framework. We show that tachyonic coupled with the f(T) gravity model can describe the inflation era in which f(T) is an arbitrary function of torsion scalar T. For this purpose, dynamical behavior of the tachyonic field in different potentials is studied, it is shown that the tachyonic field with these potentials can be an effective candidate for inflation. Then, we discuss slow-roll conditions and show that by the appropriate choice of the parameters, the inflation era can be explained via this model. Finally, we argue that our model not only satisfies the result of BICEP2, Keck Array and Plank for the upper limit of $$r < .012$$ but also, the obtained value for spectral index $$n_{s}$$ is compatible with the results of Plank and also Plank + WMAP + HighL + BAO at the 68% confidence level.

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Amin Rezaei Akbarieh, Yousef Izadi. Tachyon inflation in teleparallel gravity, The European Physical Journal C, 2019, 366, DOI: 10.1140/epjc/s10052-019-6819-z