cosmological constant
4
9.3
- noun
- /ˌkɒzməˈlɒdʒɪkəl ˈkɒnstənt/
- Specialized
:
constante cosmológica
- So Einstein modified his equations by including a new term involving a quantity that he called the cosmological constant.
- Einstein's cosmological constant
That was this so-called cosmological term or cosmological constant.
- That was this so-called cosmological term or cosmological constant.
- String theory works best in a space with a negative cosmological constant.
- But the two parameters which are really highly fine-tuned is this cosmological constant and the value of the Higgs mass.
- So I think the the the example that seems to puzzle physicists the most is the the cosmological constant.
- Well, it's not so mysterious if you believe Einstein's cosmological constant, which was introduced in, I think a year or so after he put forward the theory.
- So look, the cosmological constant, the axion supersymmetry.
Examples
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Measurements on distant supernovae show that the universe contains a preponderance of dark energy that behaves like a cosmological constant.
Academic text (2005) -
So it's because the cosmological constant speeds up the expansion of the universe.
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So we would be adding to the cosmological constant some matter.
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Now the cosmological constant is very small.
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Maybe this problem you mentioned an hour ago about the cosmological constant, why is it so small?
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This is strange because while the cosmological constant is constant, the density of dark matter isn't.
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For the red curve that best fits the data, 70% of the cosmic energy density is attributed to a cosmological constant.
Academic text (2005) -
Astronomers in the decades following 1917 occasionally sought signs of a cosmological constant, but they only succeeded in setting an upper bound on the constant.
Academic text (2005) -
Although the answer is not certain, a consensus has emerged that Einstein's discarded cosmological constant fills the bill.
Academic text (2006) -
The cosmological constant represents a force that contributes to the universe's expansion.
Surface Forms
Morphology
The phrase is fully compositional: 'cosmological' means relating to the universe and 'constant' means a fixed value, so a learner who knows both constituents can infer it denotes a fixed parameter in cosmology. The specific technical role in Einstein's equations is specialized, but the core sense ('a fixed quantity used in cosmology') is directly derivable and therefore transparent.
Etymology
The term cosmological constant comes from joining cosmological (about the universe) and constant (a fixed number). Einstein added such a fixed number to his equations about space and gravity as a steady push to balance or change the universe's motion, so today cosmological constant means 'a fixed value in the equations that affects the universe's expansion'.