developed by Bin HU and Xue-Wen LIU
2017-Dec
optimized by Cheng-Zong RUAN
2019-Mar
###########################
python2.7 or python 3.7
CHAM is a python script for the non-linear matter power spectrum for the alternative theories to LCDM.
It contains two version of the code.
v1: Virial_calculator.py and CHAM_ori.py
v2: cham_nondyn.py
In v1, the Virial_calculator gives the critical density data, which is asked by CHAM_ori.py
In v2, cham_nondyn.py does not rely on the output of Virial_calculator.py any more, it can run independently.
Both CHAM_ori and cham_nondyn calculate the non-linear spectrum via the screened halo model.
CHAM_ori: full scenario but a bit slow...
cham_nondyn: using non-dynamical approximation (causing ~0.7% deviation) and other optimization
###########################
In order to run CHAM, you need firstly install/import 'sympy' module, 'parallel python' module and 'pyyaml' module.
The GCC compiler is needed to compile Cython extensions.
###########################
python Virial_calculator.py
python CHAM_ori.py
###########################
CC=gcc python setup.py build_ext --inplace
python cham_nondyn.py
###########################
The parameter file is 'CHAM_params.yaml'.
Users can modify it.
###########################
After running 'Virial_calculator.py', the users shall get 'delta_sc.dat'.
'delta_sc.dat' contains the inter-mediate results:
| columns | meaning |
|---|---|
| 0 | index |
| 1 | r [Mpc] |
| 2 | G_{eff}/G_N |
| 3 | initial_density |
| 4 | scale_factor @ collapse |
| 5 | growth_factor(a=1) / growth_factor(a_i) |
| 6 | critial_density |
| 7 | scale_factor @ turn_around_point |
| 8 | nonlinear_density @ turn_around_point |
After running 'CHAM.py' or 'cham_nondyn.py', the users shall get 'non-linear_mpk.dat'.
'non_linear_mpk.dat' contains the final non-linear matter power spectrum results:
| columns | meaning |
|---|---|
| 0 | k [h/Mpc] |
| 1 | 1-halo term |
| 2 | I(k) |
| 3 | linear P(k) |
| 4 | non-linear P(k) |
###########################
If you have any question, please contact:
bhu@bnu.edu.cn (Bin Hu) liuxuewen14@itp.ac.cn (Xue-Wen Liu) chzruan@mail.bnu.edu.cn (Cheng-Zong Ruan)