cosmological constant
Sign in to saveconstant representing stress-energy density of the vacuum in Einstein's equation, which accounts for the rate of expansion of the universe
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The cosmological constant is a number in Einstein's equations that represents the energy density of empty space and helps explain how fast the universe is expanding. It matters because it's essential for understanding the large-scale behavior of the universe and why that expansion appears to be accelerating.
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Article
Sketch of the timeline of the Universe in the ΛCDM model. The accelerated expansion in the last third of the timeline represents the dark-energy dominated era.
Expansion · Future