Power Spectrum (`skypy.power_spectrum`)¶

This module contains methods to model the matter power spectrum.

SkyPy provides wrappers to a number of external codes for calculating the matter power spectrum, including CAMB and CLASSY. Here we demonstrate calculating the linear matter power spectrum using eisenstein_hu and the non-linear corrections using halofit_smith:

cosmology: !astropy.cosmology.default_cosmology.get []
wavenumber: !numpy.logspace [-3, 1, 100]
eisenstein_hu_wiggle: !skypy.power_spectrum.eisenstein_hu
  wavenumber: $wavenumber
  A_s: 2.1982e-09
  n_s: 0.969453
  cosmology: $cosmology
  kwmap: 0.02
  wiggle: True
halofit: !skypy.power_spectrum.halofit_smith
  wavenumber: $wavenumber
  redshift: 0.0
  linear_power_spectrum: $eisenstein_hu_wiggle
  cosmology: $cosmology

../_images/index-11.png

This module contains methods that model the matter power spectrum.

Linear Power Spectrum¶

`CAMB`	CAMB linear matter power spectrum.
`CLASSY`	Return the CLASS computation of the linear matter power spectrum, on a two dimensional grid of wavenumber and redshift.
`eisenstein_hu`	Eisenstein & Hu matter power spectrum.
`transfer_no_wiggles`	Eisenstein & Hu transfer function without wiggles.
`transfer_with_wiggles`	Eisenstein & Hu transfer function with wiggles.

Nonlinear Power Spectrum¶

`HalofitParameters`
`halofit`	Computation of the non-linear halo power spectrum.
`halofit_smith`	Computation of the non-linear halo power spectrum.
`halofit_takahashi`	Computation of the non-linear halo power spectrum.
`halofit_bird`	Computation of the non-linear halo power spectrum.

Growth Functions¶

`growth_factor`	Growth factor.
`growth_function`	Growth function.
`growth_function_carroll`	Growth function.
`growth_function_derivative`	First derivative of the growth function.