Theoretical and observational constraints on Tachyon Inflation
  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. This realisation of Tachyon inflation also presents a large field
range which may demand further quantum corrections. We also provide examples of
potentials derived from the polynomial and the perturbative classes which are
both statistically favoured and theoretically acceptable.
