cosebis¶
Calculate COSEBIs from C_ell power spectra
File |
shear/cosebis/cl_to_cosebis/cl_to_cosebis.so |
Attribution |
Marika Asgari |
Patrick Simon |
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URL |
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Citations |
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COSEBIs (Complete Orthogonal Sets of E/B-Integral) are a set of alternative two-point statistics designed to separate E/B-modes completely on a finite angular range. They have a reasonably localised response to Fourier modes, ell, and are also easy to measure from data. This module calculates both E_n and B_n log-COSEBIs from https://arxiv.org/abs/1002.2136.
The expectation value of B-modes is zero if there is no B-mode power spectra. To calculate B-mode COSEBIs simply switch input_section_name to take B-mode Cls as input and output_section_name to avoid mixing E/B-modes.
For this CosmoSIS edition we include the cl_to_cosebis mode for a KiDS-1000 or DES+KiDS joint analysis. This is taken from the public COSEBIs library of software https://github.com/maricool/2pt_stats which includes additional software to convert xi_pm measurements into COSEBIs and calculate covariance matrices. Note the ‘maricool’ version also includes additional capability to marginalise over an uncertain c-term which we do not include here for simplicity.
Assumptions¶
Flat sky approximation
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
theta_min |
real |
0.5 |
Minimum angular distance between galaxies in arcminutes. |
theta_max |
real |
300.0 |
Maximum angular distance between galaxies in arcminutes. |
n_max |
integer |
5 |
Maximum COSEBIs mode to be calculated: n=1,2,.., n_max. |
input_section_name |
str |
shear_cl |
Section name for input cls. |
output_section_name |
str |
cosebis |
Section name for outputs. |
Wn_Output_FolderName |
str |
COSEBIS_DIR “/WnLog/” |
Folder name for Wn files. |
Wn_file_name |
str |
WnLog |
Wn file name. |
table_precision |
int |
10 |
number of digits used in saved WnLog table |
number_of_Wn_l_bins |
int |
100000 |
number of log ell bins used in saved WnLog table |
Roots_n_Norms_FolderName |
str |
COSEBIS_DIR “/TLogsRootsAndNorms” |
Folder name for Roots and Normalisations. |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
input_section_name |
ell |
real 1d |
Sample ell values for input C_ell |
|
nbin_a |
int |
Number of redshift bins in the first quantity. |
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nbin_b |
int |
Number of redshift bins in the second quantity. If nbin_a is not equal nbin_b gives an error. |
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nbin |
int |
Number of redshift bins used if nbin_a or b not found. |
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bin_i_j |
real 1d |
C_ell (no l(l+1) factor) for bin i and j. |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
output_section_name |
n |
real 1d |
Array of mode values n for COSEBIs. |
bin_i_j |
real 1d |
Array of E_n or B_n, for bin i and j. |
|
theta_min |
real |
Minimum angle in arcmin |
|
theta_max |
real |
Maximum angle in arcmin |
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nbin_a |
int |
Number of redshift bins in the first quantity. |
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nbin_b |
int |
Number of redshift bins in the second quantity. Currently nbin_a==nbin_b. |