There is accumulating evidence that (fundamental) scalar fields may exist in nature. The
gravitational collapse of such a boson cloud would lead to a boson star (BS) as a new type …

We present an up-to-date review of Big Bang Nucleosynthesis (BBN). We discuss the main
improvements which have been achieved in the past two decades on the overall theoretical …

Dynamical systems theory is especially well-suited for determining the possible asymptotic
states (at both early and late times) of cosmological models, particularly when the governing …

We provide a detailed analysis of Friedmann-Robertson-Walker universes in a wide range
of scalar-tensor theories of gravity. We apply solution-generating methods to three …

We investigate Big bang nucleosynthesis (BBN) in scalar-tensor theories of gravity with
arbitrary matter couplings and self-interaction potentials. We first consider the case of a …

Abstract We analyze the Jordan–Brans–Dicke model (JBD) of gravity, where deviations from
general relativity (GR) are described by a scalar field non-minimally coupled to the graviton …

Big bang nucleosynthesis (BBN) is studied within the framework of a two-parameter family of
tensor-scalar theories of gravitation, with a nonlinear scalar-matter coupling function a (φ)= a …

We consider the possibility of energy being exchanged between the scalar and matter fields
in scalar-tensor theories of gravity. Such an exchange provides a new mechanism which …

We investigate the late-time cosmological behavior of scalar-tensor theories with a universal
multiplicative coupling between the scalar field and the matter Lagrangian in the matter era …

This controversial book examines one of the most fundamental questions of modern
cosmology: how much matter is there in the Universe? This issue affects theories of the …