FrankenEmu¶
Emulate N-body simulations to compute nonlinear matter power
File |
structure/FrankenEmu/interface.so |
Attribution |
Suman Bhattacharya |
Salman Habib |
|
Katrin Heitmann |
|
David Higdon |
|
Juliana Kwan |
|
Earl Lawrence |
|
Christian Wagner |
|
Brian Williams |
|
Martin White |
|
URL |
|
Citations |
The Coyote Universe Extended, arXiv:1304.7849 |
Coyote Universe I: ApJ 715, 104 (2010), arXiv:0812.1052 |
|
Coyote Universe II: ApJ 705, 156 (2009), arXiv:0902.0429 |
|
Coyote Universe III: ApJ 713, 1322 (2010), arXiv:0912.4490 |
FrankenEmu is an emulator designed to interpolate among a collection of numerical N-body simulations called the Coyote Universe.
It uses a Gaussian Process interpolation between a set of simulations arranged in a Latin Hypercube 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 papers above.
Assumptions¶
LCDM in the form of the Coyote Universe simulations
Setup Parameters¶
Name |
Type |
Default |
Description |
|---|---|---|---|
dz |
real |
0.01 |
Spacing in redshift of output |
nz |
int |
300 |
Number of redshift samples. Need nz*dz<=4.0 |
do_distances |
bool |
True |
Whether to also calculate cosmological distances |
Input values¶
Section |
Name |
Type |
Default |
Description |
|---|---|---|---|---|
cosmological_parameters |
ombh2 |
real |
Baryon content |
|
ommh2 |
real |
Matter content |
||
w |
real |
Dark energy EoS. |
||
h0 |
real |
Hubble/100km/s/Mpc |
||
n_s |
real |
Scalar spectral index |
||
sigma_8 |
real |
Matter power amplitude |
Output values¶
Section |
Name |
Type |
Description |
|---|---|---|---|
matter_power_nl |
z |
real 1d |
Redshifts of samples |
k_h |
real 1d |
K wavenumbers of samples in Mpc/h |
|
p_k |
real 2d |
Matter power spectrum at samples in (Mpc/h)^-3 |
|
distances |
z |
real 1d |
Redshifts of samples |
a |
real 1d |
Scale factor of samples |
|
d_a |
real 1d |
Angular diameter distance in Mpc |
|
d_m |
real 1d |
Co-moving distance in Mpc |
|
h |
real 1d |
Hubble parameter with in units of c/Mpc |