ia_z_powerlaw¶
Add redshift dependence to IA model
File |
intrinsic_alignments/z_powerlaw/ia_z_powerlaw.py |
Attribution |
CosmoSIS team |
Niall Maccrann |
|
URL |
Basic models of intrinsic alignments assume a specific simple evolution with redshift. This module takes an existing model of the IA power spectra and modifies them by giving them additional evolution in z.
Specifically, it takes P_II and P_GI (e.g. as calculated by the la_model module) and modifies them to:
\(P_{II}(k,z) -> (1+z)^\alpha P_{II}(k,z)\)
\(P_{GI}(k,z) -> (1+z)^\alpha P_{GI}(k,z)\)
Assumptions¶
Modify the intrinsic alignment power spectra to have a power-law dependence in (1+z)
Setup Parameters¶
Name |
Type |
Default |
Description |
---|---|---|---|
name |
str |
A suffix to use for the input/output sections |
Input values¶
Section |
Name |
Type |
Default |
Description |
---|---|---|---|---|
intrinsic_alignment_parameters |
alpha |
real |
Power law index to apply. |
|
intrinsic_power |
k_h |
real 1d |
Wavenumber k values of P(k,z) samples in units of Mpc/h |
|
z |
real 1d |
Redshift values of P(k,z) samples |
||
P_K |
real 2d |
Spectrum of intrinsic-intrinsic power at samples in (Mpc/h)^{-3} |
||
matter_intrinsic_power |
k_h |
real 1d |
Wavenumber k values of P(k,z) samples in units of Mpc/h |
|
z |
real 1d |
Array; redshift values of P(k,z) samples |
||
P_K |
real 2d |
Spectrum of matter-intrinsic cross-power at samples in (Mpc/h)^{-3} |
Output values¶
Section |
Name |
Type |
Description |
---|---|---|---|
intrinsic_power |
k_h |
real 1d |
Wavenumber k values of P(k,z) samples in units of Mpc/h (unchanged from input) |
z |
real 1d |
Redshift values of P(k,z) samples (unchanged from input) |
|
P_K |
real 2d |
; updated spectrum of intrinsic-intrinsic power at samples in (Mpc/h)^{-3} |
|
matter_intrinsic_power |
k_h |
real 1d |
Wavenumber k values of P(k,z) samples in units of Mpc/h (unchanged from input) |
z |
real 1d |
Redshift values of P(k,z) samples (unchanged from input) |
|
P_K |
real 2d |
Updated spectrum of matter-intrinsic cross-power at samples in (Mpc/h)^{-3} |