cosmological constant


: a constant term used in the relativistic equations for gravity to represent a repulsive force which may account in part for the rate of expansion of the universe

Examples of cosmological constant in a Sentence

Recent Examples on the Web The fact that the vacuum energy density the cosmological constant has, this very tiny value is certainly one of the most puzzling. Steven Strogatz, Quanta Magazine, 26 July 2023 Chief among them is the cosmological constant, which is essentially the mathematical equivalent of dark energy. Darren Orf, Popular Mechanics, 13 July 2023 And the cosmological constant, in turn, is thought to get its energy from the vacuum. Manon Bischoff, Scientific American, 24 Apr. 2023 In other words, if dark energy is the cosmological constant, then w should equal -1. Ramin Skibba, WIRED, 30 June 2023 At this point, the cosmological constant came back into fashion as a possible explanation for this mysterious form of energy. Manon Bischoff, Scientific American, 24 Apr. 2023 This is known as the cosmological constant problem. Briley Lewis, Popular Science, 20 Mar. 2023 This is sort of the cosmological constant. Steven Strogatz, Quanta Magazine, 22 Feb. 2023 So one thing about a cosmological constant. Steven Strogatz, Quanta Magazine, 22 Feb. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'cosmological constant.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1928, in the meaning defined above

Time Traveler
The first known use of cosmological constant was in 1928

Dictionary Entries Near cosmological constant

Cite this Entry

“Cosmological constant.” Dictionary, Merriam-Webster, Accessed 6 Dec. 2023.

More from Merriam-Webster on cosmological constant

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!