Materia oscura escalar compleja (parte I): la versi\'on hidrodin\'amica
  In this work we use the Euler hydrodynamic equations of fluids to study a
model of galactic halos minimally coupled to a complex scalar field, which in
the Newtonian limit they become the Schr\"odinger-Poisson system. Applying a
Madelung transformation, this system of equations takes the form of
hydrodynamics equations, where there are a self-interacting potential and a
kind of quantum potential that depends non-linearly on the density of the
fluid. In this theoretical framework we analyze the Jeans' instability, which
is useful for finding the scale length of perturbations of the scalar field
that will form structures. In other words, perturbations of the scalar field
with lengths less than this threshold length, can not lead to the formation of
galactic structures. We also show that this scalar field hydrodynamic system
has vorticity.
