Explanation for the expansion and acceleration of the universe from "summary" of Endless Universe by Paul J. Steinhardt,Neil Turok
The discovery that the universe is not only expanding but also accelerating in its expansion has been one of the most surprising and perplexing findings of modern cosmology. This phenomenon challenges our understanding of the fundamental forces and particles that govern the cosmos, as well as our conceptions of space and time themselves. One proposed explanation for this cosmic acceleration is the existence of a mysterious form of energy known as dark energy. Dark energy is thought to make up about 70% of the total energy density of the universe and is believed to be driving the accelerated expansion we observe. However, the nature of dark energy remains one of the greatest mysteries in physics, as it does not behave like any known form of matter or radiation. Another intriguing possibility is that the acceleration of the universe is a consequence of the...
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