bacco_emulator

Emulate the non-linear, baryonified, matter power spectrum

File	structure/baccoemu/baccoemu_interface.py
Attribution	Giovanni Aricò
	Raul E. Angulo
	Sergio Contreras
	Lurdes Ondaro-Mallea
	Marcos Pellejero-Ibañez
	Matteo Zennaro
	Jens Stücker
	Simon Samuroff
URL	https://bitbucket.org/rangulo/baccoemu
Citations	https://doi.org/10.1093/mnras/stab1911
	https://doi.org/10.1093/mnras/stab2018
	https://doi.org/10.12688/openreseurope.14310.2

Baccoemu is a collection of cosmological neural-network emulators for large-scale structure statistics in a wide cosmological parameter space, including dynamical dark energy and massive neutrinos. These emulators were developed as part of the Bacco project.

We imported the Bacco Emulator code into this directory because the PyPI version of the code is not recent, and it has some dependencies that we would like to install from conda-forge rather than PyPI (tensorflow). We have to make one change to it to make it work on python 3.8 and 3.9 - replacing the progressbar2 library with TQDM. A patch file with this change is included.

The license for this package says copyright belongs to the python packaging authority, but that seems unlikely.

Assumptions

• Neural network emulation of NL baryonic power effcts

• w0waCDM cosmology

Setup Parameters

Name	Type	Default	Description
mode	str	pk_nl_only	What to emulate; the NL DM-only power, the baryonic boost, or both. Choose from ‘nonlinear’, ‘baryons’, ‘nonlinear+baryons’. If ‘baryons’ is chosen then the NL power is read from the block (e.g. from camb). Otherwise the NL power is emulated.

Input values

Section	Name	Type	Default	Description
matter_power_lin	z	real 1d		Redshifts of samples.
	k_h	real 1d		Wavenumbers k of samples in Mpc/h.
	p_k	real 2d		Linear power spectrum at samples in (Mpc/h)^-3.
matter_power_nl	z	real 1d		Redshifts of samples. Only if mode = = “baryons”.
	k_h	real 1d		Wavenumbers k of samples in Mpc/h. Only if mode = = “baryons”.
	p_k	real 2d		Linear power spectrum at samples in (Mpc/h)^-3. Only if mode = = “baryons”.
cosmological_parameters	A_s	real		Amplitude of the primordial power spectrum.
	omega_c	real		Cold dark matter density parameter
	omega_b	real		Baryon density parameter
	n_s	real		Primordial power spectrum spectral index.
	h0	real		Hubble parameter.
	mnu	real		Sum of neutrino masses in eV.
	w0	real	-1.0	Dark energy equation of state parameter at z=0
	wa	real	0.0	Dark energy equation of state rate of change with scale factor
baryon_parameters	M_c	real		Gas mass parameter; log scale in Msun/h. Range 9.0 to 15.0
	eta	real		Ejected gas density exponential cut-off scale, in range -0.698 to 0.698
	beta	real		Gas mass index parameter; log scale, in range -1.0 to 0.698
	M1_z0_cen	real		characteristic halo mass scale for central galaxies, in range 9.0 to 13.0; log scale in Msun/h
	theta_out	real		Scaling of r200 to give outer power-law profile scale of hot gas radius. Range 0.0 to 0.477
	theta_inn	real		Scaling of r200 to give inner power-law profile scale of hot gas radius. Range -2.0 to -0.522
	M_inn	real		Characteristic mass of inner hot gas; log scale in Msun/h. Range 9.0 to 13.5.

Output values

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	Non-linear power spectrum at samples in (Mpc/h)^-3, potentially including baryon corrections.