Constants

Newton's gravitational constant in units of kpc km^2 / Msun / s^2.

Newton's gravitational constant in units of cm^3 / g / s^2.

Number of centimeters in a kiloparsec.

Number of kilometers in a kiloparsec.

Linear overdensity threshold for halo collapse for the spherical top-hat collapse model, $3/5 \times (3π/2)^{2/3}$.

Prefactor for the critical density of the Universe, in units of g / cm^3,

\[\frac{3}{8πG} \ \left(100 \ \text{km} \ \text{s}^{-1} \ \text{Mpc}^{-1} \right)^2\]

Prefactor for the critical density of the Universe, in units of Msun / kpc^3,

\[\frac{3}{8πG} \ \left(100 \ \text{km} \ \text{s}^{-1} \ \text{Mpc}^{-1} \right)^2\]

Prefactor for the critical density of the Universe, in units of Msun / Mpc^3,

\[\frac{3}{8πG} \ \left(100 \ \text{km} \ \text{s}^{-1} \ \text{Mpc}^{-1} \right)^2\]

Conversion factor between CMB temperature and neutrino temperature, $\frac{4}{11}^{1/3}$.