Transition of Expansion Acceleration of the Universe Through Negative Mass

This letter explains that density of positive mass and negative mass is almost uniformly throughout the whole universe, but density of positive mass and negative mass included in a random universe radius R can be different from each other. Like this, positive, zero, negative values of total gravitational potential energy are all possible due to density difference of positive mass and negative mass included in a random universe radius R. This letter is showing possibility in explaining the decelerating expansion and accelerating expansion due to density difference of positive mass and negative mass because negative mass and positive mass conducts different forms of movement depending on the density difference of positive mass and negative mass. As change of total gravitational potential energy sign occurs from UT=0 and total gravitational potential energy oscillates based on 0. This provides valid explanation regarding to the problems of the flatness of the universe and fine tuning.