growth_factor¶
returns linear growth factor and growth rate for flat cosmology with either const w or variable DE eos w(a) = w + (1-a)*wa
File |
structure/growth_factor/interface.so |
Attribution |
CosmoSIS Team |
URL |
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
Assumptions¶
linear growth factor and rate in flat cosmology
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
zmin |
real |
0.0 |
Min value to save f,D |
zmax |
real |
3.0 |
Max value to save f,D |
dz |
real |
0.01 |
Redshift binsize |
zmax_log |
real |
1100.0 |
Redshift max for additional z values tacked above zmax, log space |
nz_log |
int |
0.0 |
Number of log spaced values (if 0 then no log-spaced values) |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
cosmological_parameters |
omega_m |
real |
Baryon + cdm density fraction today |
|
omega_lambda |
real |
1-omega_m |
Dark energy density today |
|
w |
real |
-1.0 |
Equation of state of dark energy w(z=0) |
|
wa |
real |
0.0 |
Equation of state parameter in w(z) = w_0 + w_a z / (1+z) |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
growth_parameters |
d_z |
real 1d |
Linear growth factor D(z) |
f_z |
real 1d |
Linear growth rate f(z) |
|
z |
real 1d |
Redshift of samples |