Natural quintessence with gauge coupling unification

Abstract

We show that a positive accelerating universe can be obtained simply by the dynamics of a non-Abelian gauge group. The condensates of the chiral fields obtain a negative power potential below the condensation scale Lambda(c) and allow for a quintessence interpretation of these fields. The only free parameters are N(c), N(f), and the number of dynamically gauge singlet bilinear fields straight phi generated below Lambda(c). We show that it is possible to have unification of all coupling constants, while having an acceptable phenomenology of straight phi as quintessance, without any fine-tuning of the initial conditions. The coincidence problem is not solved but it is put at the same level as that of the particle content of the standard model.