GR is a postulate based on no simpler postulates than its 20 page equations.
We experience force everyday ... dont we ? Try to Jump on the floor and it will become obvious that curvature of space time doesnt propel you into an effortless trajectory... Obviously you are jumping against the inertial destiny of matter surrounding you.
The water in the dam falls under the force of gravity...
And the theory claims that there is no force. It claims that forces vanish when consider the space time as curved... !!
If such a space time exists then it exists only in mathematics and not in real world.
Actually any straight line coordinates can be transformed into curvilinear coordiantes but does that change the knowledge of properties contained in the coordinate system..? No.
The chain of causuality remains entact... the magnitudes and directions of the properties might change...but not the cause and effect..
Similarly by transforming the flat time space into curved time space doesnt and shouldnt make the force vanish otherwise the causuality gets violated.. If a water from the dam fall then it is bound to produce a force to move the turbine.. without force the turbine can not move...
In other words GR claims that turbine never moves in curved space time becuase the gravitational force is absent in the curved space time.
Whitehead's theory explains all the experimental observations...except few , however the theory is not dead as the proponents of the GR make us believe.
What I am criticizing here is not just GR but the general approach towards relativity type solutions including quantum gravity...
Curved space time can never replace the real physics because that is what matters.. Curved space time is an illusion created to serve mathematicians not physicists.
Curved space time is not a real coordinate system....
Reimann theorem states that only real coordinates can coorespond to real space and time..(rods and watches)
Curved space times is only the parametric representation of flat space time... the curvature is related by the metric of curved space time.
The metric can exist in any form ... and therefore it is used to adjust to the observed gravity...
Had there been no observation of grvaitational field then we wouldnt have asked the question... !!
The theory still fails to answer why this metric only ?
In other words why gravity ?
Why not something else ?
(What is force ? Force is equal to mass X acceleration.. or you can understand it as resistance to any change)