Calculateur de Densité d'Énergie Noire
Calculez la densité d'énergie noire dans l'univers.
Dark Energy Density
0.000000000000000000000000005924 kg/m³
Dark Energy Density vs Cosmological Constant (Lambda)
Formule
## Calculating Dark Energy Density Dark energy drives the accelerating expansion of the universe. Its density is linked to the cosmological constant. ### Formula **rho_Lambda = Lambda * c² / (8 pi G)** - *Lambda* is the cosmological constant (~1.1 x 10⁻⁵² m⁻²) - *c* is the speed of light - *G* is the gravitational constant The resulting density is extremely small but dominates the total energy budget of the cosmos.
Exemple Résolu
Use the observed cosmological constant Lambda = 1.1056e-52 m⁻².
- 01rho = Lambda * c² / (8 pi G)
- 02c² = (2.998e8)² = 8.988e16
- 038 pi G = 8 * 3.14159 * 6.674e-11 = 1.676e-9
- 04rho = 1.1056e-52 * 8.988e16 / 1.676e-9
- 05rho ≈ 5.93e-27 kg/m³
Questions Fréquentes
What fraction of the universe is dark energy?
Observations indicate that dark energy constitutes roughly 68% of the total energy density of the universe.
Is the cosmological constant truly constant?
In the standard Lambda-CDM model it is. Some alternative theories propose a slowly varying dark-energy component called quintessence.
Why is the dark energy density so small yet so important?
Although tiny per cubic metre, it fills all of space uniformly and has been driving accelerating expansion for billions of years.