Theoretical and observational constraints on Tachyon Inflation

Understand

We constrain several models in Tachyonic Inflation derived from the large-$N$ formalism by considering theoretical aspects as well as the latest observational data.

• On the theoretical side, we assess the field range of our models by means of the excursion of the equivalent canonical field.
• On the observational side, we employ BK14+PLANCK+BAO data to perform a parameter estimation analysis as well as a Bayesian model selection to distinguish the most favoured models among all four classes here presented.
• We observe that the original potential $V \propto \textrm{sech}(T)$ is strongly disfavoured by observations with respect to a reference model with flat priors on inflationary observables.