Space/time? Another Theory

[Zunk]

     Time as we are told is relative, determined by mass and or velocity of an object. The larger or faster the object the greater the gravitational field will be. The great work in America on the LIGO detector has proved the existence of gravitational waves. I propose that gravity is natural function of the universe and that time is an expression that. Therefore the universe could be best described as SPACE/GRAVITY not SPACE/TIME. From this the "arrow of time" is derived from gravity.                            Super massive black holes create, according to theory, infinite density at their centre,  the consequences of this would be time standing still. From this I deduce time cannot go backwards as it is only a way of observing gravity.