distances¶
Output cosmological distance measures for dynamical dark energy
File |
background/dynamical_de_distances/distances.py |
Attribution |
CosmoSIS team (code) |
URL |
|
Citations |
Linder, E.V. 2003. Phys. Rev. Lett. 90:091301 |
Huterer, D., Turner, M.S. 2001. Phys. Rev. D64:123527 |
|
Wetterich, C. 2004 Physics Letters B, Volume 594 |
This small module was written for CosmoSIS. This module computes the angular diameter distance, luminosity distance, and distance modulus for three different parametrisations of dark energy. w = w0 +(1-a)wa, w = w0+(ap-a)wa and and 2 parameter EDE w(a) model from Wetterich 2004.
Assumptions¶
None
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
verbose |
bool |
False |
Whether to provide additional feedback |
w_model |
int |
0 |
Model choice. 0 for (w0,wa), 1 for (w0,wa,ap), 2 for EDE model (w0,ode_e) |
zmin |
real |
0.0 |
The minimum redshift at which to calculate the distance |
zmax |
real |
0.0 |
The maximum redshift at which to calculate the distance |
dz |
real |
0.01 |
The spacing between output redshift samples |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
cosmological_parameters |
h0 |
real |
Hubble parameter H0 / (100 km/s/Mpc) |
|
omega_k |
real |
0.0 |
Curvature density fraction today |
|
omega_b |
real |
Baryon density fraction today |
||
omega_c |
real |
CDM density fraction today |
||
w0 |
real |
-1.0 |
Equation of state w(z=0) of dark energy |
|
wa |
real |
0.0 |
Equation of state parameter w(a) = w_0 + w_a*(1-a) |
|
ap |
real |
Pivot scale factor w(a) = w_0 + w_a*(ap-a) |
||
ode_e |
real |
Early dark energy parameter |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
distances |
nz |
int |
Number of background z samples |
z |
real 1d |
Redshifts of samples |
|
d_a |
real 1d |
Angular diameter distance in Mpc |
|
d_m |
real 1d |
Co-moving distance in Mpc |
|
d_l |
real 1d |
Luminosity distance in Mpc |
|
mu |
real 1d |
Distance modulus |