Observational constraints on complex quintessence with attractive self-interaction

In this paper we consider that dark energy could be described solely by a complex scalar field with a Bose-Einstein condensate-like potential, that is, with a self-interaction and a mass term. We analyze a particular solution which in a fast oscillation regime at late times behaves as a cosmological constant. First, we will show that this proposal adequately describes the standard homogeneous Fridman dynamics. However, we show that the precision cosmological test using current surveys show that the equation of state (EoS) w of such model, which depends on a single parameter, fails to adequately describe a dynamical dark energy since the analysis in fact constrains the scalar field parameters within values ruled out by the theoretical model.