CosmoFit.cosmology.RecombinationCalculator¶

class CosmoFit.cosmology.RecombinationCalculator(cosmology)[source]¶

Bases: object

Recombination-epoch quantities for a given cosmology, following the CMB distance-prior conventions (see the module docstring).

Parameters:: cosmology (Cosmology) – Cosmological model. Uses H0, Omega_m, Omega_k, Omega_b, and the model’s own E(z)/Omega_de(z).

__init__(cosmology)[source]¶

Methods

`E_cmb`(z)	E(z) including radiation, normalized so that `E_cmb(0) = 1`.
`__init__`(cosmology)
`chi_star`([z_star, n_grid])	Dimensionless comoving distance to `z_star`,
`sound_horizon`([z, n_grid, decades])	Comoving sound horizon [Mpc] at redshift `z`:
`sound_horizon_eh98`()	Comoving sound horizon [Mpc] via the closed-form Eisenstein & Hu (1998) Eq.
`summary`()	Return z_star, r_s(z_star), and the densities they were computed from, in a single dict.
`z_star`()	Redshift of photon decoupling, from a fit calibrated against CAMB (see `_ZSTAR_COEF`).
`z_star_hs96`()	Redshift of photon decoupling from the Hu & Sugiyama (1996) fitting formula, Eq.

Attributes

`Omega_r`	Present-day radiation density parameter, defined as the priors define it (CHW19 Eq.
`h`	Dimensionless Hubble parameter, h = H0 / 100.
`omega_b_h2`	Physical baryon density, Omega_b * h^2.
`omega_m_h2`	Physical matter density, Omega_m * h^2.
`z_eq`	Matter-radiation equality redshift, CHW19 Eq.