Massive Gauge-flation
  Gauge-flation model at zeroth order in cosmological perturbation theory
offers an interesting scenario for realizing inflation within a particle
physics context, allowing us to investigate interesting possible connections
between inflation and the subsequent evolution of the Universe. Difficulties,
however, arise at the perturbative level, thus motivating a modification of the
original model. In order to agree with the latest Planck observations, we
modify the model such that the new dynamics can produce a relation between the
spectral index $n_{s}$ and the tensor-to-scalar ratio $r$ allowed by the data.
By including an identical mass term for each of the fields of the system, we
find interesting dynamics leading to slow-roll inflation of the right length.
The presence of the mass term has the potential to modify the $n_{s}$ vs. $r$
relation so as to agree with the data. As a first step, we study the model at
zeroth order in cosmological perturbation theory, finding the conditions
required for slow-roll inflation and the number of e-foldings of inflation.
Numerical solutions are used to explore the impact of the mass term. We
conclude that the massive version of Gauge-flation offers a viable inflationary
model.
