USAAAO 2015, I кръг — Задача 17

USAAAO First Round 2015

Условие

Given that dark energy is vacuum energy, and that the densities of dark energy, dark matter and normal matter in the universe are currently $\rho_{\Lambda} = 6.7 \times 10^{-30}\ g/cm^3$, $\rho_{DM} = 2.4 \times 10^{-30}\ g/cm^3$ and $\rho_{\Lambda} = 0.5 \times 10^{-30}\ g/cm^3$, what is the ratio of the density of dark energy at the time of the cosmic microwave background emission, to the current density of dark energy?
a. 0.432
b. 2.31
c. 1
d. 2.5
e. 0.5

Отговори

Решение

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Оригинал в Архива: 2015-first-round-exam.pdf · официални решения: 2015-first-round-solutions.pdf