__________________ (George Berkeley, 1710) ... lay the beginning in a distinct explication of what is meant by thing, reality, existence: for in vain shall we dispute concerning the real existence of things, or pretend to any knowledge thereof, so long as we have not fixed the meaning of those words.
"All things come out of the one and the one out of all things." - Heraclitus "Reality is an illusion - albeit a persistent one." - Einstein "Particles give me a headache." - Ibid
Used to work in an organization of 400 people and it requires at least one licensed CPR for every 50 employees, not CPA. If this person is a beautiful female employee then there were many fake heart attacks by the men employees, but the opposite is not quite as proportionally distributed.
The days are getting shorter but the nights are getting longer. Soon it will be just all nights.
__________________ Time independence: [∂E(g)]²=[∂F(a)×∂r(a)]·[∂F(b)×∂r(b)] and Mass independence: ¶a(t)·¶r(t)=c²
Wish we had one. That heart attacked is the main reason why I have a big floppy heart now. I now have a difibrulator installed. It went off a couple times when I was teaching but no more heart attacks thank God.
Return to your first post “…..Einstein never explains why masses could ever affect empty space-time….”. Einstein is genius; he could create an “abstract” geometry of space-time via Einstein tensor. And then changing it to a “physically” one, by equating it to the “physically” energy-momentum tensor of the existing mass and energy, in his famous field equation!
But we are not as smart as Einstein, which could imagine something abstractly, so let us try to grasp his idea physically. By analogy to the earth affect the surrounding atmosphere (which acts as a physical space-time) and bending the passing light ray!
Now we have the consequent problem about the nature of vacuum space, which then lead us return to the problem of the existence of the old aether! But let us first assumed that there is “something” (mass or energy) in vacuum space, and then we have a medium for handing gravitation force. Anyway, even we now know how mass affect light or “how masses attract each other”, we still have another problem that is “why masses attract each other”!
Next, let us assumed (again) that “gravity is the property of mass or energy”, and we know that mass is composed of proton and electron. Here, let us assume further that both particles are the “condense of the “something” which existing in vacuum space, so both of them would have a strong gravity property, i.e. they act like tiny black holes! Then all material masses would attract each other via the physical surrounding space!
By the way, we have left the problem of the “three assumptions”, so these have to be solved later.
Re: gravity not explained 
Linear Mode
