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The cosmological constant may drive the universe's accelerated expansion from "summary" of The Fabric of the Cosmos by Brian Greene

According to our current understanding of the universe, the expansion that began with the Big Bang continues today. Scientists initially believed that this expansion would gradually slow down due to the mutual gravitational pull of all the matter in the cosmos. However, recent observations have revealed that the universe's expansion is actually accelerating rather than slowing down. This unexpected discovery has led scientists to consider the possibility that some mysterious force, known as the cosmological constant, may be driving this accelerated expansion. The cosmological constant was first proposed by Albert Einstein in his theory of general relativity. Initially, Einstein included the cosmological constant in his equations to achieve a static universe, as was the prevailing belief at the time. However, after the discovery of the expanding universe, Einstein abandoned the cosmological constant, referring to it as his "biggest blunder." In the ...
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    The Fabric of the Cosmos

    Brian Greene

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