Journal
MODERN PHYSICS LETTERS A
Volume 31, Issue 21, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732316400058
Keywords
Non-Abelian gauge fields; inflation
Categories
Funding
- COLCIENCIAS - ECOS NORD Grant [RC 0899-2012]
- COLCIENCIAS [110656933958 RC 0384-2013, 123365843539 RC FP44842-081-2014]
- COLCIENCIAS - ECOS NORD Grant [RC 0899-2012]
- COLCIENCIAS [110656933958 RC 0384-2013, 123365843539 RC FP44842-081-2014]
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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 ms 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 ms versus 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.
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