SciPy

darkhistory.physics.CMB_spec

darkhistory.physics.CMB_spec(eng, temp)

CMB spectrum in number of photons cm-3 eV-1.

The normalization used here is

\[\frac{dN}{dE \, dV} = \frac{E^2}{\pi^2 (\hbar c)^3} \frac{1}{e^{E/T_\text{CMB}} - 1} \,,\]

with TCMB given in eV. Returns zero if E > 500 TCMB.

Parameters:
temp : float

Temperature of the CMB in eV.

eng : float or ndarray

Energy of the photon in eV.

Returns:
ndarray

The number density of photons per unit energy in eV.

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