Neither Albert Einstein or Stephen Hawkins are correct in their theories on the origin of the Universe, although there are portions of both theories that contain some element of truth. The Universe is not inert, subject to pressures that cause it to explode or compress back into black holes. It is no more inert than your body. It is alive. When we speak of religion, and say we are all parts of the One, that we are within God, and that the Universe is within God, we are referring to this. The natural laws that seem immutable to you are functioning as they are because this is Gods intention at the present time. Much of what you desire to learn will not be available to you until you reach greater spiritual maturity. It is not even on the platter during your next stage of development, 4th Density, the Service-to-Self or Service-to-Other consolidation stage.
Following a Big Bang, particular matter forms along the following lines. First, the explosion of matter from a Black Hole, which has grown monstrously large in the eons leading up to a particular Big Bang, is not even. No explosions are even, and all affect different parts of the matter they are affecting at different rates and times. Thus, particular matter coming out of a Big Bang is not even, all the same composition. Just as your Sun, which seems to be of the same consistency, is not homogeneous, and just as the core or magma of your Earth is not homogeneous, just so the matter coming out of a Big Bang quickly becomes differentiated. There are literally millions of factors affecting what a bit of matter will become, and the sum of these factors affect how that bit of matter will interact for it's existence until the next Big Bang it finds itself entangled in.
Particles that are fluid, on the move, are by their nature loosely coupling with other particles. Humans are familiar with the coupling that occurs in atoms, the nucleus surrounded by whirring electrons, for instance. Other particles couple in predictable ways. What causes attraction and repulsion between particle types? We will use a common example to explain, as the concepts can get complex. Magnetism happens due to the continuous flow of magnetic particles, a type of the particle you call electrons, but this magnetic flow is not consistent everywhere. It is concentrated where a break in the pattern of electronic orbiting a nucleus allows a mass escape. What are they escaping from? An over-concentration of whatever it is they are made of! In the case of magnetism, magnetic particles are escaping from a press of other magnetic particles, since they couple poorly and seldom, they are readily on the move.
All matter seeks a level of homogeneity, and can never achieve it as it is by its nature, coming out of the Big Bang, non-homogeneous with the other particle types. Likewise, attraction is in essence an escape, misinterpreted by the humans who have termed it otherwise. Gravity is nothing more than the effect of returning gravity particles drifting back into a gravitational giant after having been ejected in what we would equate to a laser stream of particles, which burst through rather than push at whatever is in their way to escape. Why do they drift back, and is this not an attraction to return to the gravitational giant they just recently left? As odd as it may sound to those unused to these concepts, these gravity particles are indeed running away from an environment they find clogged with matter composed of element they themselves are heavy in - what humans commonly term the Dark Matter that fills to void of space. They crowd back into what is for them a lesser field, the core of gravitational giants, where they are repeatedly ejected due to this very crowding!