hmf.density_field.transfer.Transfer

class hmf.density_field.transfer.Transfer(*args, **kwargs)

A transfer function framework.

The purpose of this hmf._frameworks.Framework is to calculate transfer functions, power spectra and several tightly associated quantities given a basic model for the transfer function.

As in all frameworks, to update parameters optimally, use the update() method. All output quantities are calculated only when needed (but stored after first calculation for quick access).

In addition to the parameters directly passed to this class, others are available which are passed on to its superclass. To read a standard documented list of (all) parameters, use Transfer.parameter_info(). If you want to just see the plain list of available parameters, use Transfer.get_all_parameters().To see the actual defaults for each parameter, use Transfer.get_all_parameter_defaults().

By default, the growth_model is GrowthFactor. However, if using a wCDM cosmology and camb is installed, it will default to CambGrowth.

Methods

__init__([sigma_8, n, z, lnk_min, lnk_max, …])	Initialize self.
clone(**kwargs)	Create and return an updated clone of the current object.
get_all_parameter_defaults([recursive])	Dictionary of all parameters and defaults.
get_all_parameter_names()	Yield all parameter names in the class.
get_dependencies(*q)	Determine all parameter dependencies of the quantities in q.
parameter_info([names])	Prints information about each parameter in the class.
quantities_available()
update(**kwargs)	Update parameters of the framework with kwargs.
validate()

Attributes

cosmo	Cosmographic object (astropy.cosmology.FLRW object), with custom cosmology from cosmo_params applied.
cosmo_model	The basis for the cosmology – see astropy documentation.
cosmo_params	Parameters for the cosmology that deviate from the base cosmology passed.
delta_k	Dimensionless power spectrum, \(\Delta_k = \frac{k^3 P(k)}{2\pi^2}\).
dlnk	Step-size of log wave-numbers
growth	The instantiated growth model.
growth_factor	The growth factor.
growth_model	The model to use to calculate the growth function/growth rate.
growth_params	Relevant parameters of the growth_model.
k	Wavenumbers, [h/Mpc]
lnk_max	Maximum (natural) log wave-number, k [h/Mpc].
lnk_min	Minimum (natural) log wave-number, k [h/Mpc].
mean_density0	Mean density of universe at z=0, [Msun h^2 / Mpc**3]
n	Spectral index of fluctuations
nonlinear_delta_k	Dimensionless nonlinear power spectrum.
nonlinear_power	Non-linear log power [units \(Mpc^3/h^3\)].
parameter_values	Dictionary of all parameters and their current values
power	Normalised log power spectrum [units \(Mpc^3/h^3\)].
sigma_8	RMS linear density fluctuations in spheres of radius 8 Mpc/h
takahashi	Whether to use updated HALOFIT coefficients from Takahashi+12
transfer	The instantiated transfer model
transfer_function	Normalised CDM log transfer function.
transfer_model	Defines which transfer function model to use.
transfer_params	Relevant parameters of the transfer_model.
z	Redshift.