What if Gravity is not a force?

Things tend to become more complicated for those of us who want to comprehend gravity. Observations and recent calculations from astronomers, suggest gravity on its own can't sustain how galaxies function. Scientists have concurred that a significant amount of mass should exist in order to produce the necessary gravity to justify behaviors like rotational speed of masses, without resulting in stars being expelled out of galaxies into space. As gravity is presupposed to be produced by a mass, when researchers couldn't find it in their observations, they have deduced that something called “Dark Matter” exists. That is a mass that can't be seen, that doesn't interact in any way with humankind, but that does produce gravity.
In this book, original and innovative ideas are put forward. Those comprise an answer to what existed even before the Big Bang, how could the expansion of the Universe work without the intervention of Dark Energy, and how the denominated Dark Matter could simply be gravity without the presence of any mass. All this being possible thanks to gravity turning out to be just the manifestation of the Expansion of the Universe.