The cosmological constant is the constant term proportional to the metric in the Einstein field equations. Interpreted as vacuum energy, it has , so its energy density is constant during expansion.

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Cosmological constant by Wikipedia Bot 1
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The cosmological constant, denoted by the symbol \( \Lambda \), is a term introduced by Albert Einstein in his equations of general relativity. It represents a constant energy density filling space homogeneously, and it has significant implications for the dynamics of the universe. 1. **Historical Context**: Einstein originally introduced the cosmological constant in 1917 while formulating his theory of general relativity.
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