pyhmcode

Compute the non-linear matter power spectrum with pyhalofit

File	structure/pyhmcode/hmcode_interface.py
Attribution	Xiangchong Li (interface)
	Tilman Troester (pyhmcode)
	Alexander Mead (HMCode)
URL	https://github.com/tilmantroester/pyhmcode
Citations	HMCode2015: Mead et al. (2015; https://arxiv.org/abs/1505.07833)
	HMCode2016: Mead et al. (2016; https://arxiv.org/abs/1602.02154)
	HMCode2020: Mead et al. (2021; https://arxiv.org/abs/2009.01858)
	HMx: Mead, Tröster et al. (2020; https://arxiv.org/abs/2005.00009)

HMCode uses a halo model approach, in which dark matter is modelled as a population of bound halos and observable quantities are related to the properties of these halos and the tracer distribution within them.

There is a version of HMCode included in CAMB, which you can use through cosmosis - see the camb module non-linear options. There is also an independent HMCode, and a set of python wrappings, pyhmcode.

This is not the official pyhmcode CosmoSIS interface, but one made for the HSC likelihood in order to match the CAMB settings as closely as possible.

Assumptions

• The HMCode family of models for the non-linear matter power spectrum

Setup Parameters

Name	Type	Default	Description
verbose	bool	False	Whether to print extra output
version	str	HMcode2020	Which version of HMCode to use. Options are HMcode2016, HMcode2016_1par, HMcode2020, HMcode2020_feedback

Input values

Section	Name	Type	Default	Description
halo_model_parameters	A_bary	real		Halo concentration parameter. Only read if version is HMcode2016 or HMcode2016_1par.
	eta0	real		Halo profile scaling parameter. Only read if version is HMcode2016. Set to 0.98 - 0.12 * A_bary in the 1par model.
	logT_AGN	real		AGN temperature parameter. Only read if version is HMcode2020_feedback..
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.
	omega_m	real		Matter density fraction of critical
	omega_b	real		Baryon density fraction of critical
	omega_lambda	real		Dark energy density fraction of critical
	mnu	real		Sum of neutrino masses (in eV)
	sigma_8	real		Amplitude of linear matter power at 8/h Mpc at z=0.
	h0	real		Dimensionless Hubble h = H_0 / 100 km/s/Mpc
	n_s	real		Primordial scalar spectral index

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.