fast_pt

Compute various 1-loop perturbation theory quantities

File	structure/fast_pt/fast_pt_interface.py
Attribution	Niall Maccrann
	Jonathan Blazek
URL	https://github.com/JoeMcEwen/FAST-PT
Citations	https://iopscience.iop.org/article/10.1088/1475-7516/2016/09/015

The FAST-PT library computes a selection of quantities which are integrals over the 3D matter power spectrum, coupled with itself by a mode-coupling kernel.

This module runs that library to compute various terms that are useful for either intrinsic alignment calculations for the TATT model, and/or galaxy bias terms.

This module is not fully documented yet

Assumptions

• 1-loop perturbation theory

Setup Parameters

Name	Type	Default	Description
do_dd_spt	bool	False	Compute matter power spectrum terms
do_ia	bool	False	Compute intrinsic alignment TATT terms
do_bias	bool	False	Compute galaxy bias terms
do_rsd	bool	False	Compute redshift space distortion terms
do_ia_tt	bool	False	Compute intrinsic alignment tidal torqing terms
do_ia_ta	bool	False	Compute intrinsic alignment tidal alignment terms
do_ia_mix	bool	False	Compute intrinsic alignment mixed terms
bias_section	str	bias	Name of block section to load bias parameter from
output_nl_grid	bool	False	Whether to save a grid of nonlinear matter power
only_terms	bool	False	Whether to save only PT terms not actual spectra
always_init	bool	False	Re-initialize FAST-PT at every parameter space point
k_res_fac	real	4.0	Factor to increase k-space resolution
low_extrap	real	-5.0	Log10 value of k down to which to extrapolate
high_extrap	real	3.0	Log10 value of k up to which to extrapolate
C_window	real	0.75	Taper fourier coefficients at \(|m|\) > C_window * N/2
n_pad_fac	real	1.0	Number of zeros to pad the FT with
verbose	bool	False	Print extra output

Input values

Section	Name	Type	Default	Description
matter_power_lin	z	real 1d		Redshifts of samples
	k_h	real 1d		Wavenumbers k of samples in Mpc/h.
	p_k	real 2d		Linear power spectrum at samples in (Mpc/h)^-3.
matter_power_nl	z	real 1d		Redshifts of samples
	k_h	real 1d		Wavenumbers k of samples in Mpc/h.
	p_k	real 2d		Non-linear power spectrum at samples in (Mpc/h)^-3.
bias_section	b_1	real		Linear bias term
	b_2	real		Quadratic bias term
	b_s	real		s bias term
	b1_alpha	real	0.0	Power law index for b1
	b2_alpha	real	0.0	Power law index for b2
	bs_alpha	real	0.0	Power law index for bs
	b1_z0	real	0.0	Power law baseline for b1
	b2_z0	real	0.0	Power law baseline for b2
	bs_z0	real	0.0	Power law baseline for bs

Output values

Output values

Section	Name	Type	Description
fastpt	z	real 1d	Redshift values at which terms are calculated
	k_h	real 1d	Wavenumber values at which linear terms are calculated
	k_h_nl	real 1d	Wavenumber values at which non-linear terms are calculated
	Plin	real 2d	Linear matter power from FAST-PT
	Pd1d2	real 2d	Perturbative quantity not yet documented
	Pd2d2	real 2d	Perturbative quantity not yet documented
	Pd1s2	real 2d	Perturbative quantity not yet documented
	Pd2s2	real 2d	Perturbative quantity not yet documented
	Ps2s2	real 2d	Perturbative quantity not yet documented
	Pgg	real 2d	Galaxy density power spectrum
	Pggsub	real 2d	Perturbative quantity not yet documented
	Pmg	real 2d	Matter-galaxy cross-power from
	sig4kz	real 2d	Perturbative quantity not yet documented
	one_loopkz	real 2d	Perturbative quantity not yet documented
	P1Lkz	real 2d	Perturbative quantity not yet documented
	Pkz2	real 2d	Perturbative quantity not yet documented
	Pd1d2_o	real 2d	Perturbative quantity not yet documented
	Pd2d2_o	real 2d	Perturbative quantity not yet documented
	Pd1s2_o	real 2d	Perturbative quantity not yet documented
	Pd2s2_o	real 2d	Perturbative quantity not yet documented
	Ps2s2_o	real 2d	Perturbative quantity not yet documented
	Pgg_o	real 2d	Galaxy density power spectrum on the nonlinear grid
	Pggsub_o	real 2d	Perturbative quantity not yet documented
	Pmg_o	real 2d	Matter-Galaxy power spectrum on the nonlinear grid
	sig4kz_o	real 2d	Perturbative quantity not yet documented
	P_tt_EE	real 2d	Tidal torquing E-mode power spectrum
	P_tt_BB	real 2d	Tidal torquing B-mode power spectrum
	P_ta_dE1	real 2d	Perturbative quantity not yet documented
	P_ta_dE2	real 2d	Perturbative quantity not yet documented
	P_ta_EE	real 2d	Tidal-alignment E-mode power spectrum
	P_ta_BB	real 2d	Tidal-alignment B-mode power spectrum
	P_mix_A	real 2d	Perturbative quantity not yet documented
	P_mix_B	real 2d	Perturbative quantity not yet documented
	P_mix_D_EE	real 2d	Perturbative quantity not yet documented
	P_mix_D_BB	real 2d	Perturbative quantity not yet documented
galaxy_power	z	real 1d	Redshifts of samples
	k_h	real 1d	Wavenumbers k of samples in Mpc/h.
	p_k	real 2d	Matter density - Galaxy density cross power spectrum
galaxy_power_sublowk	z	real 1d	Redshifts of samples
	k_h	real 1d	Wavenumbers k of samples in Mpc/h.
	p_k	real 2d	Perturbative quantity not yet documented