Cosmological Parameters

Object providing the fundamental cosmological parameters that describe the background Universe: matter density \(\Omega_\mathrm{m}\), dark energy density \(\Omega_\Lambda\), baryon density \(\Omega_\mathrm{b}\), radiation density \(\Omega_\mathrm{r}\), curvature \(\Omega_k\), Hubble constant \(H_0\), and CMB temperature \(T_\mathrm{CMB}\). These parameters are used throughout Galacticus to compute cosmological distances, times, and densities.

Default implementation: cosmologyParametersSimple

Methods

OmegaMatter → double precision

Return the cosmological matter density in units of the critical density at the present day.

OmegaDarkEnergy → double precision

Return the cosmological dark energy density in units of the critical density at the present day.

OmegaBaryon → double precision

Return the cosmological baryon density in units of the critical density at the present day.

OmegaRadiation → double precision

Return the cosmological radiation density in units of the critical density at the present day.

OmegaCurvature → double precision

Return the cosmological curvature density in units of the critical density at the present day.

HubbleConstant → double precision

Return the Hubble constant at the present day. The optional units argument specifies if the return value should be in units of km/s/Mpc (hubbleUnitsStandard), Gyr\(^{-1}\) (hubbleUnitsTime), or 100 km/s/Mpc (hubbleUnitsLittleH).

  • type(enumerationHubbleUnitsType), intent(in ), optional :: units

temperatureCMB → double precision

Return the temperature of the cosmic microwave background radiation (in units of Kelvin) at the present day.

densityCritical → double precision

Return the critical density at the present day in units of \(\mathrm{M}_\odot/\)Mpc\(^3\).

cosmologyParametersSimple

Provides basic cosmological parameters including the matter density \(\Omega_\mathrm{M}\), baryon density \(\Omega_\mathrm{b}\), dark energy density \(\Omega_\Lambda\), CMB temperature \(T_\mathrm{CMB}\), and Hubble constant \(H_0\), all specified as input parameters. Also computes derived quantities including the curvature density \(\Omega_\mathrm{K}\), radiation density \(\Omega_\mathrm{r}\), and critical density \(\rho_\mathrm{crit}\).

(Default implementation)

Methods

  • calculationReset — Reset memoized calculations.

Parameters

  • [OmegaMatter] (real; default 0.3153d0) — The density of matter in the Universe in units of the critical density.

  • [OmegaBaryon] (real; default 0.04930d0) — The density of baryons in the Universe in units of the critical density.

  • [OmegaDarkEnergy] (real; default 0.6847d0) — The density of dark energy in the Universe in units of the critical density.

  • [temperatureCMB] (real; default 2.72548d0) — The present day temperature of the CMB in units of Kelvin.

  • [HubbleConstant] (real; default 67.36d0) — The present day value of the Hubble parameter in units of km/s/Mpc.