Quantum Vacuum, Big Bang, Entropy: Which is the Starting Point? The quantum vacuum is a material medium capable of polarization and equipped with its own electric permittivity, permeability and dielectric constant. It has been hypothesized that our Universe arose from a perturbation in the quantum vacuum, when an inflationary mechanism, correlated with a false vacuum state, led to the production of cosmic matter and to the huge expansion that took place 1-35 seconds after the Big Bang. Therefore, according to this framework, the vacuum endowed in our Universe is primitive to it. In this brief note, we go through a different scenario.