the concept of the universe expansion is a well known concept but it is directly related to the big bang theory. i myself find the big bang theory the most wise theory ever created concerning the origin of the universe.
However the great "crunch" is another concept which says that after the universe expands to a certain "lets say volume" it will stop expanding and at that very moment the forces acting on its "edges" will redirect themselves towards its center ( the point from which the big bang started) and crunch the universe back to its original state. ( an extreeemly massive point).
ur theory is different as it assumes that the both effects are acting at the same time. well thats cool but remember one thing
when it comes to the "Universe stuff" i recommend using quantum physics and the general realativity instead of the classical mechanics.
AS newton's first law contradicts with the big bang theory itself ( the extreemly dense point didnt need any forces to act upon).
But then the question remains, why did this point of origin lost it and blow off, i think we will never know...... at least in this life:-)
Mohamed leila
Cairo