← Mathematical compendium

Published equation contexts

ΩΛ≈0.7\Omega_\Lambda \approx 0.7

Why this formula appears here

What actually happened next is the part worth stating precisely. In 1998, two independent supernova teams measuring the expansion history of the universe with distant Type Ia supernovae found that the expansion is accelerating, and the Supernova Cosmology Project’s analysis of forty-two high-redshift supernovae reported, for a flat universe, a matter density of ΩM\Omega_M = 0.28 with combined statistical and systematic uncertainties of a few hundredths, and stated that the data indicated a nonzero, positive cosmological constant at 99 percent confidence [ 3 ] . That result places the implied vacuum energy density at roughly ΩΛ\Omega_\Lambda ≈\approx 0.7 — a value sitting comfortably inside the…

Read the full article-specific guide →

Read the representative guide

ΩΛ\Omega_\Lambda

Symbol Omega_Lambda

OmegaLa_Lambda is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Read this term in its guide →

How to interpret it

Its accuracy depends on the assumptions and range of use described in the article.

Research cited beside this formula

Published contexts (1)

A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.

ΩΛ≈0.7\Omega_\Lambda \approx 0.7

Equation 6 · Evolutionary Physics

Fine-Tuning Without a Tuner: Selection Effects in Physics

This equation gives an approximation: it relates the quantities while allowing an approximation.

What actually happened next is the part worth stating precisely. In 1998, two independent supernova teams measuring the expansion history of the universe with distant Type Ia supernovae found that the expansion is accelerating, and the Supernova Cosmology Project’s analysis of forty-two high-redshift supernovae reported, for a flat universe, a matter density of ΩM\Omega_M = 0.28 with combined statistical and systematic uncertainties of a few hundredths, and stated that the data indicated a nonzero, positive cosmological constant at 99 percent confidence [ 3 ] . That result places the implied vacuum energy density at roughly ΩΛ\Omega_\Lambda ≈\approx 0.7 — a value sitting comfortably inside the…

Equation guide → · Article →