Massive Gauge-flation

Abstract

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.

LaTeX file in ws-mpla style, 15 pages, 18 figures. v2: several miscellaneous changes. Some numerical problems with the plots were detected and solved but the conclusions are unchanged. Version accepted for publication in Modern Physics Letters A

References in corpus (6)

• Vector Inflation
• Instability of anisotropic cosmological solutions supported by vector fields
• Derivative self-interactions for a massive vector field
• Instabilities in the Aether
• Higgs Dark Energy
• A new perspective on Gauge-flation

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