constant representing stress-energy density of the vacuum in Einstein's equation, which accounts for the rate of expansion of the universe
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.
AI-generated from the Wikipedia summary — may contain errors.
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
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).