If we look at the expression for gravity
g=−12.dv2tdx
Integrating both sides
−2∫gdx=∫dv2t1=v2t1 ----(1)
The left hand side is negative given that g decreases with increasing x.
We have seen that g is of the form,
g=−Go.1(x+re)2
where the negative sign suggests that g, a vector is pointing towards x=0. Integrating,
∫gdx=Go.1(x+re)+A ----(2)
Combining the above equations (1) and (2) and using constant C=-2A
vt=√C−2Go(x+re)
Since we know that at no gravity, space is not compressed where x→∞, vt=c, we have C=c2, the normal time speed. Therefore,
vt=√c2−2Go(x+re)
This expression is time speed at various distance x, at x = 0 space is densest.