Abstract
Horndeski derived a most general vector-tensor theory in which the vector field respects the gauge symmetry and the resulting dynamical equations are of second order. The action contains only one free parameter, λ, that determines the strength of the non-minimal coupling between the gauge field and gravity. We investigate the cosmological consequences of this action and discuss observational constraints. For λ < 0 we identify singularities where the deceleration parameter diverges within a finite proper time. This effectively rules out any sensible cosmological application of the theory for a negative non-minimal coupling. We also find a range of parameter that gives a viable cosmology and study the phenomenology for this case. Observational constraints on the value of the coupling are rather weak since the interaction is higher-order in space-time curvature.
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Barrow, J.D., Thorsrud, M. & Yamamoto, K. Cosmologies in Horndeski’s second-order vector-tensor theory. J. High Energ. Phys. 2013, 146 (2013). https://doi.org/10.1007/JHEP02(2013)146
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DOI: https://doi.org/10.1007/JHEP02(2013)146