title: Conformal fixed point, cosmological constant, and quintessence.
abstract: We connect a possible solution for the "cosmological constant problem" to the existence of a (postulated) conformal fixed point in a fundamental theory. The resulting cosmology leads to quintessence, where the present acceleration of the expansion of the universe is linked to a crossover in the flow of coupling constants.
authors.affiliation: Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg, Germany.
authors.forename: Christof
authors.initials: C
authors.lastname: Wetterich