CosmicEmu¶
Emulate N-body simulations to compute nonlinear matter power
File |
structure/cosmic_emu/interface.so |
Attribution |
Katrin Heitmann |
Derek Bingham |
|
Earl Lawrence |
|
Steven Bergner |
|
Salman Habib |
|
David Higdon |
|
Adrian Pope |
|
Rahul Biswas |
|
Hal Finkel |
|
Nicholas Frontiere |
|
Suman Bhattacharya |
|
URL |
|
Citations |
The Mira-Titan Universe: Precision Predictions for Dark Energy Surveys, ApJ, 820, 2 (2016), arXiv:1508.02654 |
CosmicEmu is an emulator designed to interpolate among a collection of numerical N-body simulations called Mira-Titan.
It uses a Gaussian Process interpolation between a set of simulations arranged in a lattice in parameter space.
Each simulation yields a non-linear matter power spectrum P(k,z), and the interpolation is between these spectra, so the output should be a reasonable (1% accuracy) value of P(k,z) for the given parameters.
The simulations and the whole process are explained in detail in the paper above.
Assumptions¶
w0waCDM and the Mira-Titan simulation assumptions
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
zmax |
real |
2.0 |
Maximum output redshift |
nz |
int |
50 |
Number of redshift samples. Note that the code will be interpolating between sample values |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
cosmological_parameters |
ombh2 |
real |
Physical baryon content |
|
ommh2 |
real |
Physical matter content |
||
w |
real |
-1.0 |
Dark energy equation of state |
|
wa |
real |
0.0 |
Dark energy equation of state derivative |
|
h0 |
real |
Hubble/100km/s/Mpc |
||
n_s |
real |
Scalar spectral index |
||
sigma_8 |
real |
Power spectrum normalization |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
matter_power_nl |
z |
real 1d |
Redshifts of samples |
k_h |
real 1d |
Wavenumbers k of samples in Mpc/h |
|
p_k |
real 2d |
Matter power spectrum at samples in (Mpc/h)^-3 |