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

  • [efficiencyWind] (default 2.2157d-3) — The coupling efficiency of the black hole accretion-driven wind, defined as the fraction of the accreted rest-mass energy that is deposited as kinetic or thermal energy into the surrounding gas via AGN-driven outflows.

  • [redshiftReionization] (default 9.97d0) — The redshift of reionization below which baryonic accretion onto halos is suppressed due to the ionizing background heating the intergalactic medium and preventing gas from accreting onto low-mass halos.

  • [opticalDepthReionization] — The optical depth to electron scattering below which baryonic accretion is suppressed.

  • [velocitySuppressionReionization] (default 35.0d0) — The velocity scale below which baryonic accretion is suppressed.

  • [accretionNegativeAllowed] (default .true.) — Specifies whether negative accretion (mass loss) is allowed in the simple halo accretion model.

  • [accretionNewGrowthOnly] (default .false.) — Specifies whether accretion from the IGM is allowed only when a halo is growing past its previous greatest mass.

  • [acceptedStateCount] (default 100) — The number of states to use in acceptance rate statistics.

  • [timeStepRelative] (default 0.1d0) — The maximum allowed relative change in time for a single step in the evolution of a node.

  • [timeStepAbsolute] (default 1.0d0) — The maximum allowed absolute change in time (in Gyr) for a single step in the evolution of a node.

  • [timeStepMinimum] (default 1.0d-6) — The smallest timestep to use in profiling ODE solver steps.

  • [timeStepMaximum] (default 1.0d+1) — The largest timestep to use in profiling ODE solver steps.

  • [timeStepPointsPerDecade] (default 3) — The number of bins per decade of timestep to use when profiling ODE solver steps.

  • [wavelength] (default 1.0d4) — The wavelength of the photon packet (in AA).

  • [wavelengthMinimum] (default 0.5d4) — The minimum wavelength of the photon packet (in AA).

  • [wavelengthMaximum] (default 2.0d4) — The maximum wavelength of the photon packet (in AA).

  • [luminosity] (default 1.0d0) — The luminosity of the photon packet (in \(L_\odot\)).

  • [massRatioMajorMerger] (default 0.25d0) — The mass ratio above which mergers are considered to be “major”.

  • [destinationGasMinorMerger] (default var_str('spheroid')) — The component to which satellite galaxy gas moves to as a result of a minor merger.

  • [destinationStarsMinorMerger] (default var_str('spheroid')) — The component to which satellite galaxy stars move to as a result of a minor merger.

  • [degreesOfFreedom] (default 3.0d0) — Number of degrees of freedom to assume when computing the energy density of cooling gas in the “simple” cooling time class.

  • [timeScale] (default 1.0d0) — The timescale (in Gyr) for cooling in the simple cooling rate model.

  • [reionizationRedshift] (default 9.97d0) — The redshift of reionization in the simple IGM state model.

  • [reionizationTemperature] (default 1.0d4) — The post-reionization temperature (in units of Kelvin) in the simple IGM state model.

  • [preReionizationTemperature] (default 10.0d0) — The pre-reionization temperature (in units of Kelvin) in the simple IGM state model.

  • [useFormationHalo] (default .false.) — Specifies whether or not the “formation halo” should be used when solving for the radii of galaxies.

  • [solveForInactiveProperties] (default .true.) — If true, galactic structure is solved for during evaluation of inactive property integrals. Otherwise, structure is not solved for during this phase—this should only be used if the inactive property integrands do not depend on galactic structure.

  • [rateFractionalMaximum] (default 10.0d0) — The maximum fractional mass loss rate per dynamical time in the simple model of mass loss due to tidal stripping.

  • [beta] (default 1.0d0) — The scaling factor which multiplies the tidal mass loss rate.

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

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

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

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

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