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growth_factor module
returns linear growth factor and growth rate for flat cosmology with either const w or variable DE eos w(a) = w + (1-a)*wa
Name: growth_factor
File: cosmosis-standard-library/structure/growth_factor/interface.so
Version: 1
Author(s):
- CosmoSIS Team
URL:
Cite:
Rules:
Assumptions:
- linear growth factor and rate in flat cosmology
Explanation
This simple module calculates the linear growth factor D, and linear growth rate, f, for flat cosmology with either const w or variable DE eos w(a) = w + (1-a)*wa. Where D, f are defined by the growth of a
linear perturbation, delta, with scale factor a: delta(a') = delta(a)*(D(a')/D(a)) and f = dlnD/dlna
##Parameters
These parameters can be set in the module's section in the ini parameter file.
If no default is specified then the parameter is required.
| Parameter | Description |
|---|---|
| zmin | Real, min value to save f,D (default = 0.0) |
| zmax | Real, max value to save f,D (default = 3.0) |
| dz | Real, redshift binsize (default = 0.01) |
| zmax_log | Real, default=1100. redshift max for additional z values tacked above zmax, log space |
| nz_log | int, default=0. number of log spaced values (if 0 then no log-spaced values) |
##Inputs
These parameters and data are inputs to the module, either supplied as parameters by the sampler or computed by some previous module. They are loaded from the data block.
| Section | Parameter | Description |
|---|---|---|
| cosmological_parameters | omega_m | real, baryon + cdm density fraction today |
| omega_lambda | real, dark energy density today (default 1-omega_m) | |
| w | real, w(z=0) equation of state of dark energy (default -1.0) | |
| wa | real, equation of state parameter w(z) = w_0 + w_a z / (1+z) (default 0.0) |
##Outputs
These parameters and data are computed as outputs from the module
| Section | Parameter | Description |
|---|---|---|
| growth_parameters | d_z | 1D real array, linear growth factor D |
| f_z | 1D real array, linear growth rate f | |
| z | 1D real array, redshift of samples |
Updated