According to Newton’s law of gravity (F = GMm / r²), the classical definition of gravity should be “the interaction between mass and mass”.

What’s the modern definition of gravity? I heard some physicist / philosopher said that it’s “curvature of space - time”.

I don’t know whether I should agree with them. My own consideration is as below:

What cause the “curvature of space - time”? That’s the root of gravity. The “curvature of space - time” is just a method employing space and time to describe the existence of gravity.

Any opinion is appreciated. Thank you.

Liqiang Chen

Oct 9, 2020