Einstein's equations may need revision from "summary" of Endless Universe by Paul J. Steinhardt,Neil Turok
The realization that Einstein's equations may need revision is a stunning development with far-reaching implications for our understanding of the universe. For decades, these equations have been the cornerstone of modern physics, providing the mathematical framework for our understanding of gravity and the structure of spacetime. However, recent theoretical and observational evidence has raised doubts about the completeness of Einstein's theory of gravity, known as general relativity. One of the key reasons why Einstein's equations may need revision is the discovery of dark energy, a mysterious form of energy that is driving the accelerated expansion of the universe. General relativity predicts a static or contracting universe, so the existence of dark energy presents a significant challenge to the theory. In order to account for dark energy, physicists have proposed modifications to Einstein's equations, such as the addition of a cosmological constant or the introduction of new fields that interact with gravity in novel ways. Another reason why Einstein's equations may need revision is the existence of singularities in black holes and the Big Bang. According to general relativity, these singularities represent points where spacetime curvature becomes infinitely large, l...
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