flip.power_spectra.models

flip.power_spectra.models#

Functions#

bel_coefficients(sigma_8)

The bel_coefficients function takes in a value for sigma_8 and returns the values of the coefficients

get_bel_model(wavenumber, power_spectrum_linear, **kwargs)

The get_bel_model function takes in the linear power spectrum, wavenumber, and sigma_8 value.

get_nonlinearbel_model(wavenumber, ...)

The get_nonlinearbel_model function returns the nonlinear power spectra for a given linear power spectrum.

get_linearbel_model(wavenumber, power_spectrum_linear, ...)

The get_linearbel_model function returns the linear BEL model for a given power spectrum.

get_linear_model(wavenumber, power_spectrum_linear, ...)

Module Contents#

flip.power_spectra.models.bel_coefficients(sigma_8)[source]#

The bel_coefficients function takes in a value for sigma_8 and returns the values of the coefficients a_i, i = 1, 2, 3 and invkdelta as well as b. These are used to calculate the non-linear power spectrum using the fitting formula from Bel et al. (2007). The function is called by Class when calculating P(k)

Parameters:

sigma_8 – Calculate the coefficients of the bessel function

Returns:

The coefficients a_i, i = 1,

flip.power_spectra.models.get_bel_model(wavenumber, power_spectrum_linear, **kwargs)[source]#

The get_bel_model function takes in the linear power spectrum, wavenumber, and sigma_8 value. It then calculates the nonlinear matter-matter power spectrum using a fitting function from Bel et al. (2014). The function also returns the nonlinear matter-matter cross correlation coefficient.

Parameters:

  • wavenumber – Calculate the power spectrum

  • power_spectrum_linear – Calculate the nonlinear power spectrum

  • **kwargs – Pass a variable number of keyword arguments to a function

:param : Calculate the nonlinear power spectrum

Returns:

The nonlinear matter power spectrum and the nonlinear galaxy clustering power spectrum

flip.power_spectra.models.get_nonlinearbel_model(wavenumber, power_spectrum_linear, **kwargs)[source]#

The get_nonlinearbel_model function returns the nonlinear power spectra for a given linear power spectrum.

Parameters:

  • wavenumber – Get the wavenumber of the power spectrum

  • power_spectrum_linear – Calculate the power_spectrum_mt and power_spectrum_tt

  • **kwargs – Pass a variable number of keyword arguments to a function

:param : Get the nonlinear power spectrum

Returns:

The nonlinear power spectrum of matter, the cross power spectrum of matter and tracers and the auto-power spectrum of tracers

flip.power_spectra.models.get_linearbel_model(wavenumber, power_spectrum_linear, **kwargs)[source]#

The get_linearbel_model function returns the linear BEL model for a given power spectrum.

Parameters:

  • wavenumber – Calculate the wavenumber in h/mpc

  • power_spectrum_linear – Calculate the power spectrum of the matter field

  • **kwargs – Pass a variable number of keyword arguments to the function

:param : Set the value of the power spectrum

Returns:

The linear power spectrum and the

flip.power_spectra.models.get_linear_model(wavenumber, power_spectrum_linear, **kwargs)[source]#
Contents