cosmological constant


Definition of 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 Now, physicists say, the unnaturalness of the Higgs makes the unnaturalness of the cosmological constant more significant. Quanta Magazine, "Is Nature Unnatural?," 24 May 2013 Einstein had invented this idea, called the cosmological constant, to balance gravity and keep the universe static and unchanging., "“They really, sort of tell us something very essential — existential — about our place in the universe,” Ulf Danielsson, a member of the Nobel committee, said during an interview broadcast on the web.," 9 Oct. 2019 In some cases, like with dark energy, Peebles helped show that a cosmological constant can make the Universe work long before the experimental evidence is present. John Timmer, Ars Technica, "Nobel in physics is a two-fer: Big Bang and exoplanets," 8 Oct. 2019 Even those open to the multiverse idea would love to have alternative solutions to the cosmological constant problem to explore. Quanta Magazine, "Why the Tiny Weight of Empty Space Is Such a Huge Mystery," 12 Mar. 2018 The elements of string theory that Joe developed are intrinsic to recent attempts to better understand how inflation happened and why the cosmological constant is so small. Quanta Magazine, "Physicists Mourn Joe Polchinski, Developer of Deep Ideas and Paradoxes," 20 Feb. 2018 In seminal work in 2000, Polchinski and a collaborator argued that the plethora of solutions of string theory enables the small value of the cosmological constant to be interpreted as a selection effect. Quanta Magazine, "Physicists Mourn Joe Polchinski, Developer of Deep Ideas and Paradoxes," 20 Feb. 2018 About 20 years ago, astrophysicists discovered that the expansion of the universe is accelerating, driven by an incredibly small source of energy infused in space, known as the cosmological constant. Quanta Magazine, "Physicists Mourn Joe Polchinski, Developer of Deep Ideas and Paradoxes," 20 Feb. 2018 Albert Einstein introduced the cosmological constant in 1917 as an additional term in the equation of gravity. Quanta Magazine, "Finding Dark Energy in the Details," 18 Sep. 2014

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cosmological constant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cosmological constant

1928, in the meaning defined above

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The first known use of cosmological constant was in 1928

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Cite this Entry

“Cosmological constant.” Dictionary, Merriam-Webster, Accessed 5 Jul. 2020.

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