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In contrast to all other modern theories of fundamental interactions, general relativity is a classical theory: it does not include the effects of quantum physics. The quest for a quantum version of general relativity addresses one of the most fundamental open questions in physics.
In theoretical physics, the problem of time is a conceptual conflict between quantum mechanics and general relativity.Quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative.
General relativity, also known as the general theory of relativity, and as Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics. General relativity generalizes special relativity and refines Newton's law of universal gravitation ...
Gravitational singularities exist at a junction between general relativity and quantum mechanics; therefore, the properties of the singularity cannot be described without an established theory of quantum gravity. Trying to find a complete and precise definition of singularities in the theory of general relativity, the current best theory of ...
General relativity is the geometrical theory of gravitation published by Albert Einstein in 1915/16. [ 9 ] [ 10 ] It unifies special relativity, Newton's law of universal gravitation , and the insight that gravitation can be described by the curvature of space and time.
In Chapters 5 and 6, time has been explained only in terms of pre-modern physics. Chapter 7, "Time and the Quantum", gives insights into time's nature in the quantum mechanics. Probability plays a major role in this chapter because it is an inescapable part of quantum mechanics. The double slit experiment is revisited to reveal things about the ...
Also, under the principle of minimal coupling, the physical equations of special relativity can be turned into their general relativity counterparts by replacing the Minkowski metric (η ab) with the relevant metric of spacetime (g ab) and by replacing any partial derivatives with covariant derivatives. In the discussions that follow, the ...
It rapidly became a significant and necessary tool for theorists and experimentalists in the new fields of atomic physics, nuclear physics, and quantum mechanics. By comparison, general relativity did not appear to be as useful, beyond making minor corrections to predictions of Newtonian gravitation theory. [3]