  There is a widespread belief that the classical small inhomogeneities which
gave rise to all structures in the Universe through gravitational instability
originated from primordial quantum cosmological fluctuations. However, this
transition from quantum to classical fluctuations is plagued with important
conceptual issues, most of them related to the application of standard quantum
theory to the Universe as a whole. In this paper, we show how these issues can
easily be overcome in the framework of the de Broglie-Bohm quantum theory. This
theory is an alternative to standard quantum theory that provides an objective
description of physical reality, where rather ambiguous notions of measurement
or observer play no fundamental role, and which can hence be applied to the
Universe as a whole. In addition, it allows for a simple and unambiguous
characterization of the classical limit.
