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Isaac Newton's apple tree at Woolsthorpe Manor [1] [2] represents the inspiration behind Sir Isaac Newton's theory of gravity.While the precise details of Newton's reminiscence (reported by several witnesses to whom Newton allegedly told the story) are impossible to verify, the significance of the event lies in its explanation of Newton's scientific thinking.
Depending on which features of general relativity and quantum theory are accepted unchanged, and on what level changes are introduced, [204] there are numerous other attempts to arrive at a viable theory of quantum gravity, some examples being the lattice theory of gravity based on the Feynman Path Integral approach and Regge calculus, [191 ...
In Einstein's theory and related theories of gravitation, curvature at every point in spacetime is also caused by whatever matter is present. Here, too, mass is a key property in determining the gravitational influence of matter. But in a relativistic theory of gravity, mass cannot be the only source of gravity.
Before Newton's law of gravity, there were many theories explaining gravity. Philoshophers made observations about things falling down − and developed theories why they do – as early as Aristotle who thought that rocks fall to the ground because seeking the ground was an essential part of their nature.
The Wheeler–Feynman theory has inspired new thinking about the arrow of time and about the nature of quantum non-locality. [22] The theory has implications for cosmology; it has been extended to quantum mechanics. [23] A similar approach has been applied to develop an alternative theory of gravity consistent with general relativity. [24]
The term "theory of relativity" was based on the expression "relative theory" (German: Relativtheorie) used in 1906 by Planck, who emphasized how the theory uses the principle of relativity. In the discussion section of the same paper, Alfred Bucherer used for the first time the expression "theory of relativity" (German: Relativitätstheorie ...
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The following facts are well established and referable: The proposal to describe gravity by means of a pseudo-Riemannian metric was first made by Einstein and Marcel Grossmann in the so-called Entwurf theory published 1913. [4] Grossmann identified the contracted Riemann tensor as the key for the solution of the problem posed by Einstein.