In this work, we derive the analytical form for a f(R) model that describes
a perfect scalar field Ï• by assuming the existence of a chameleon
mechanism. Based on four statements, at the background and perturbative level,
it is possible to relate the extra terms from this theory as a geometrical
perfect fluid term, whose has been expressed as possible candidates to explain
the nature of the dark sector, and possibly, in the case of a perfect scalar
chameleon during inflation, satisfy the big bang nucleosynthesis (BBN)
constraints until late times.Comment: 9 pages. Contribution to "Gravity, Cosmology and Astrophysics - A
Journey of Exploration and Discovery with Female Pioneers". Springer Natur