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3 days ago · Definition and basic properties. General relativity is a metric theory of gravitation. At its core are Einstein's equations, which describe the relation between the geometry of a four-dimensional pseudo-Riemannian manifold representing spacetime, and the energy–momentum contained in that spacetime. [46]
3 days ago · A variation on the theory of quantum gravity — the unification of quantum mechanics and Einstein's general relativity — could help solve one of the biggest puzzles in cosmology, new research ...
May 3, 2024 · There is no denying the awesome predictive power of Albert Einstein's 1915 theory of gravity, general relativity — yet, the theory still has inconsistencies when it comes to calculating its...
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Apr 29, 2024 · Essentially, the laws of relativity consist of two parts: the special relativity theory, which shows that time and space are intertwined and relative to the observer’s motion, and the general relativity theory, which describes gravity not as a force but as a curvature of space and time around massive objects.
May 2, 2024 · Gravity defines macroscopic behaviour, and so general relativity describes large-scale physical phenomena. General relativity follows from Einstein’s principle of equivalence: on a local scale it is impossible to distinguish between physical effects due to gravity and those due to acceleration. Gravity is treated as a geometric phenomenon ...
- The Editors of Encyclopaedia Britannica
2 days ago · The birth of relativity. To make it all work, Einstein realized there had to be some give-and-take. You can't just have length contraction — moving rulers shrink — on its own. You also need ...
May 1, 2024 · Special relativity, introduced in 1905, addressed the concepts of space and time and their relationship with the speed of light. In 1915, Einstein presented general relativity, which expanded on special relativity to include gravity and the curvature of space-time. These theories have revolutionized our understanding of physics and the universe.
